23.1.15. Geometria vettore

23.1.15.1. Aggiungi gli attributi della geometria

Calcola le proprietà geometriche di un elemento in un layer vettoriale e le include nel livello in uscita.

Si genera un nuovo vettore con gli stessi contenuti del livello in ingresso, ma con attributi aggiuntivi contenenti le misure geometriche basate sul SR selezionato.

Gli attributi aggiunti alla tabella dipendono dal tipo di geometria e dimensioni del vettore in ingresso:

• per livelli puntuali: coordinate X (xcoord), Y (ycoord), Z (zcoord) e/o valore M (mvalue)

• per livelli lineari: lunghezza e, per tipi geometrici LineString e CompoundCurve, la sinuosità degli elementi e la distanza rettilinea (straightdis)

• for livelli poligonali: perimetro e area

Menu predefinito: Vettore ▶ Strumenti di Geometria

23.1.15.1.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Calcola usando	CALC_METHOD	[numero] Predefinito: 0	Parametri di calcolo da usare per le proprietà geometriche. Uno tra: 0 — SR del vettore 1 — SR del Progetto 2 — Ellissoidale
Aggiunte informazioni geometriche	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specificare il livello vettoriale in uscita (copia di quello in ingresso con informazioni geometriche). Uno tra: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.1.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Aggiunte informazioni geometriche	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Copy of the input vector layer with the addition of the geometry fields

23.1.15.1.3. Python code

Algorithm ID: qgis:exportaddgeometrycolumns

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.2. Raggruppa geometrie

Prende un vettore o una tabella e crea un nuovo livello aggregando gli elementi basati su un’espressione di tipo ID univoco

Gli elementi per cui l’espressione ID univoco restituisce lo stesso valore sono raggruppati insieme.

È possibile raggruppare insieme tutti gli elementi della risorsa usando un valore costante nel parametro ID univoco, ad esempio: NULL.

È anche possibile raggruppare elementi in base a multipli campi usando funzioni Array, ad esempio: Array(«Campo1», «Campo2»).

Le geometrie (se presenti) sono combinate in un’unica geometria multi parte per ogni gruppo. Gli attributi in uscita sono calcolati in base ad ogni definizione di raggruppamento data.

This algorithm allows to use the default aggregates functions of the QGIS Expression engine.

Vedi anche

Collect geometries, Dissolve

23.1.15.2.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Group by expression	GROUP_BY	[tablefield: any] Default: “NULL”	Scegli il campo di raggruppamento. Se NULL tutte gli elementi saranno aggregati.
Aggregates	AGGREGATES	[list]	List of output layer field definitions. Example of a field definition: {“aggregate”: “sum”, “delimiter”: “,”, “input”: “ $area”, “length”: 10, “name”: “totarea”, “precision”: 0, “type”: 6} By default, the list contains all the fields of the input layer. In the GUI, you can edit these fields and their definitions, and you can also: Click the button to add a new field. Click to delete the selected field. Use and to change order of the fields. Click to reset to the default (the fields of the input layer). For each of the fields you’d like to retrieve information from, you need to define the following: Input expression [expression] (input) Campo o espressione del vettore in ingresso. Aggregate function [enumeration] (aggregate) Function 1 da usare sull’espressione in ingresso per restituire il valore aggregato. Predefinito: concatena (per stringhe), somma (per dati numerici) Delimiter [string] (delimiter) Stringa di testo per separare valori aggregati, per esempio nel caso di concatenazioni. Predefinito: , Output field name [string] (name) Nome dei campi aggregati nel vettore in uscita. Come opzione predefinita viene mantenuto il nome del campo in ingresso. Type [enumeration] (type) Data type of the output field. One of: 1 — Boolean 2 — Integer 4 — Integer64 6 — Double 10 — String 14 — Date 16 — DateTime Length [number] (length) Lunghezza del campo in uscita. Precision [number] (precision) Precisione del campo in uscita.
Load fields from layer	GUI only	[vettore: qualsiasi]	You can load fields from another layer and use them for the aggregation
Aggregated	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output (aggregate) layer One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.2.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Aggregated	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Multigeometry vector layer with the aggregated values

23.1.15.2.3. Python code

Algorithm ID: qgis:aggregate

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.3. Confine

Restituisce la chiusura del confine combinato della geometria (cioè il confine topologico della geometria)

Only for polygon and line layers.

For polygon geometries , the boundary consists of all the lines making up the rings of the polygon.

Fig. 23.26 Boundaries (black dashed line) of the source polygon layer

For lines geometries, the boundaries are their end points.

Fig. 23.27 Boundary layer (red points) for lines. In yellow a selected feature.

23.1.15.3.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Boundary	LIVELLO IN USCITA	[vector: point, line] Predefinito: [Crea livello temporaneo]	Specify the output (boundary) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.3.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Boundary	LIVELLO IN USCITA	[vector: point, line]	Boundaries from the input layer (point for line, and line for polygon)

23.1.15.3.3. Python code

Algorithm ID: qgis:boundary

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.4. Perimetri di delimitazione

Questo algoritmo calcola il perimetro di delimitazione (inviluppo) per ciascun elemento in un vettore in ingresso. Sono supportati geometrie poligonali e lineari.

Fig. 23.28 Le linee nere rappresentano i perimetri di delimitazione di ogni poligono dell’elemento

Permette features in-place modification 1

Vedi anche

Minimum bounding geometry

23.1.15.4.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Bounds	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output (bounding box) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.4.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Bounds	LIVELLO IN USCITA	[vector: polygon]	Bounding boxes of input layer

23.1.15.4.3. Python code

Algorithm ID: qgis:boundingboxes

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.5. Buffer

Calcola un’area di buffer per tutte gli elementi del vettore in ingresso, usando una distanza fissa.

It is possible to use a negative distance for polygon input layers. In this case the buffer will result in a smaller polygon (setback).

Fig. 23.29 Buffer (in yellow) of points, line and polygon

Permette features in-place modification 1

Default menu: Vector ▶ Geoprocessing Tools

Vedi anche

Variable distance buffer, Multi-ring buffer (constant distance), Variable width buffer (by M value)

23.1.15.5.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Distance	DISTANCE	[number ] Default: 10.0	Buffer distance (from the boundary of each feature). You can use the Data Defined button on the right to choose a field from which the radius will be calculated. This way you can have different radius for each feature (see Variable distance buffer).
Segments	SEGMENTS	[numero] Predefinito: 5	Controlla il numero di segmenti di linea da usare per approssimare un quarto di cerchio quando si creano offset arrotondati.
End cap style	END_CAP_STYLE	[numero] Predefinito: 0	Controls how line endings are handled in the buffer. One of: 0 — Arrotondato 1 — Piatto 2 — Quadrato Fig. 23.30 Stile testata arrotondato, piatto e quadrato
Join style	JOIN_STYLE	[numero] Predefinito: 0	Specifica se devono essere utilizzati stile di unione di tipo arrotondato, seghettato o smussato quando si esegue l’offset degli angoli in una linea. Le opzioni sono: 0 — Arrotondato 1 — Seghettato 2 — Smussato
Miter limit	MITER_LIMIT	[numero] Default: 2.0	Controls the maximum distance from the offset curve to use when creating a mitered join (only applicable for miter join styles). Minimum: 1.
Dissolve result	DISSOLVE	[boolean] Default: False	Dissolve the final buffer. If True (checked), overlapping buffers will be dissolved (combined) into a new feature. Fig. 23.31 Buffer standard e dissolto
Buffered	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output (buffer) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.5.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Buffered	LIVELLO IN USCITA	[vector: polygon]	Output (buffer) polygon layer

23.1.15.5.3. Python code

Algorithm ID: qgis:buffer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.6. Centroidi

Creates a new point layer, with points representing the centroids of the geometries of the input layer.

The centroid is a single point representing the barycenter (of all parts) of the feature, so it can be outside the feature borders. But can also be a point on each part of the feature.

The attributes of the points in the output layer are the same as for the original features.

Fig. 23.32 The red stars represent the centroids of the features of the input layer.

Permette features in-place modification 1

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Point on Surface

23.1.15.6.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Create centroid for each part	ALL_PARTS	[boolean ] Default: False	If True (checked), a centroid will be created for each part of the geometry
Centroids	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output (centroid) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.6.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Centroids	LIVELLO IN USCITA	[vettore: punto]	Output point vector layer (centroids)

23.1.15.6.3. Python code

Algorithm ID: qgis:centroids

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.7. Controllo validità

Esegue un controllo di validità delle geometrie del vettore.

The geometries are classified in three groups (valid, invalid and error) and for each group, a vector layer with its features is generated:

• The Valid output layer contains only the valid features (without topological errors).

• The Invalid output layer contains all the invalid features found by the algorithm.

• The Error output layer is a point layer that points to where the invalid features were found.

The attribute tables of the generated layers will contain some additional information («message» for the error layer, «FID» and «_errors» for the invalid layer and only «FID» for the valid layer):

The attribute table of each generated vector layer will contain some additional information (number of errors found and types of error):

Fig. 23.33 Left: the input layer. Right: the valid layer (green), the invalid layer (orange)

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Fix geometries and the core plugin Plugin Controllo Geometria

23.1.15.7.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	INPUT_LAYER	[vettore: qualsiasi]	Livello vettoriale in ingresso
Method	METHOD	[numero] Default: 2	Method to use to check validity. Options: 0: The one selected in digitizing settings 1: QGIS 2: GEOS
Ignore ring self intersection	IGNORE_RING_SELF_INTERSECTION	[boolean] Default: False	Ignore self intersecting rings when checking for validity.
Valid output	VALID_OUTPUT	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the vector layer to contain a copy of the valid features of the source layer. One of: Skip output Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.
Invalid output	INVALID_OUTPUT	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Vector layer containing copy of the invalid features of the source layer with the field _errors listing the summary of the error(s) found. One of: Skip output Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.
Error output	ERROR_OUTPUT	[vettore: punto] Predefinito: [Crea livello temporaneo]	Point layer of the exact position of the validity problems detected with the message field describing the error(s) found. One of: Skip output Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.7.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Count of errors	ERROR_COUNT	[numero]	The number of geometries that caused errors.
Error output	ERROR_OUTPUT	[vettore: punto]	Vettore puntuale dell’esatta posizione del problema di validità individuato con il campo message che descrive l”/gli errore/i trovato/i.
Count of invalid features	INVALID_COUNT	[numero]	The number of invalid geometries.
Invalid output	INVALID_OUTPUT	[lo stesso del livello in ingresso]	Vector layer containing copy of the invalid features of the source layer with the field _errors listing the summary of the error(s) found.
Count of valid features	VALID_COUNT	[numero]	The number of valid geometries.
Valid output	VALID_OUTPUT	[lo stesso del livello in ingresso]	Vector layer containing a copy of the valid features of the source layer.

23.1.15.7.3. Python code

Algorithm ID: qgis:checkvalidity

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.7.4. Types of error messages and their meanings

Tabella 23.1 If the GEOS method is used the following error messages can occur:

Error message	Explanation	Example
Repeated point	This error happens when a given vertex is repeated.
Ring self-intersection	This error happens when a geometry touches itself and generates a ring.
Self-intersection	This error happens when a geometry touches itself.
Topology validation error
Hole lies outside shell
Holes are nested
Interior is disconnected
Nested shells	This error happens when a polygon geometry is on top of another polygon geometry.
Duplicate rings	This error happens when two rings (exterior or interior) of a polygon geometry are identical
Too few points in geometry component
Invalid coordinate	For a point geometry, this error happens when the geometry does not have a proper coordinate pair. The coordinate pair does not contain a latitude value and a longitude value in that order.
Ring is not closed

Tabella 23.2 If the QGIS method is used the following error messages can occur:

Error message	Explanation	Example
Segment %1 of ring %2 of polygon %3 intersects segment %4 of ring %5 of polygon %6 at %7
Ring %1 with less than four points
Ring %1 not closed
Line %1 with less than two points
Line %1 contains %n duplicate node(s) at %2	This error happens when consecutive points on a line have the same coordinates.
Segments %1 and %2 of line %3 intersect at %4	This error happens when a line self intersects (two segments of the line intersect each other).
Ring self-intersection	This error happens when an outer or inner (island) ring / boundary of a polygon geometry intersects itself.
Ring %1 of polygon %2 not in exterior ring
Polygon %1 lies inside polygon %2	This error happens when a part of a MultiPolygon geometry is inside a hole of a MultiPolygon geometry.

23.1.15.8. Collect geometries

Takes a vector layer and collects its geometries into new multipart geometries.

One or more attributes can be specified to collect only geometries belonging to the same class (having the same value for the specified attributes), alternatively all geometries can be collected.

All output geometries will be converted to multi geometries, even those with just a single part. This algorithm does not dissolve overlapping geometries - they will be collected together without modifying the shape of each geometry part.

See the “Promote to multipart” or “Aggregate” algorithms for alternative options.

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Raggruppa geometrie, Promote to multipart, Dissolve

23.1.15.8.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Unique ID fields	FIELD	[tablefield: any] [list]	Choose one or more attributes to collect the geometries
Collected	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Vector layer with collected geometries

23.1.15.8.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Collected	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer for the collected geometries. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.8.3. Python code

Algorithm ID: qgis:collect

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.9. Concave hull (alpha shapes)

Computes the concave hull of the features in an input point layer.

Fig. 23.34 Concave hulls with different thresholds (0.3, 0.6, 0.9)

Vedi anche

Convex hull, Concave hull (k-nearest neighbor)

23.1.15.9.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Input point layer	IN INGRESSO	[vettore: punto]	Input point vector layer
Threshold	ALPHA	[numero] Default: 0.3	Number from 0 (maximum concave hull) to 1 (convex hull).
Allow holes	HOLES	[boolean] Default: True	Choose whether to allow holes in the final concave hull
Split multipart geometry into singlepart geometries	NO_MULTIGEOMETRY	[boolean] Default: True	Check if you want to have singlepart geometries instead of multipart ones.
Concave hull	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.9.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Concave hull	LIVELLO IN USCITA	[vector: polygon]	Livello vettoriale in uscita

23.1.15.9.3. Python code

Algorithm ID: qgis:concavehull

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.10. Concave hull (k-nearest neighbor)

Generates a concave hull polygon from a set of points. If the input layer is a line or polygon layer, it will use the vertices.

The number of neighbors to consider determines the concaveness of the output polygon. A lower number will result in a concave hull that follows the points very closely, while a higher number will have a smoother shape. The minimum number of neighbor points to consider is 3. A value equal to or greater than the number of points will result in a convex hull.

If a field is selected, the algorithm will group the features in the input layer using unique values in that field and generate individual polygons in the output layer for each group.

Vedi anche

Concave hull (alpha shapes)

23.1.15.10.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Number of neighboring points to consider (a lower number is more concave, a higher number is smoother)	KNEIGHBORS	[numero] Default: 3	Determines the concaveness of the output polygon. A small number will result in a concave hull that follows the points very closely, while a high number will make the polygon look more like the convex hull (if the number is equal to or larger than the number of features, the result will be the convex hull). Minimum value: 3.
Field Optional	FIELD	[tablefield: any] Default: None	If specified, one concave hull polygon is generated for each unique value of the field (by selecting features using this value).
Concave hull	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.10.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Concave hull	LIVELLO IN USCITA	[vector: polygon]	Livello vettoriale in uscita

23.1.15.10.3. Python code

Algorithm ID: qgis:knearestconcavehull

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.11. Convert geometry type

Generates a new layer based on an existing one, with a different type of geometry.

Not all conversions are possible. For instance, a line can be converted to a point, but a point cannot be converted to a line. A line can also be converted to a polygon.

Vedi anche

Polygonize, Lines to polygons

23.1.15.11.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
New geometry type	TYPE	[numero] Predefinito: 0	Geometry type to apply to the output features. One of: 0 — Centroids 1 — Nodes 2 — Linestrings 3 — Multilinestrings 4 — Polygons
Convertito	LIVELLO IN USCITA	[vettore: qualsiasi] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.11.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Convertito	LIVELLO IN USCITA	[vettore: qualsiasi]	Output vector layer - the type depends on the parameters

23.1.15.11.3. Python code

Algorithm ID: qgis:convertgeometrytype

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.12. Convex hull

Calculates the convex hull for each feature in an input layer.

See the “Minimum bounding geometry” algorithm for a convex hull calculation which covers the whole layer or grouped subsets of features.

Fig. 23.35 Black lines identify the convex hull for each layer feature

Permette features in-place modification 1

Default menu: Vector ▶ Geoprocessing Tools

Vedi anche

Minimum bounding geometry, Concave hull (alpha shapes)

23.1.15.12.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Convex hull	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.12.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Convex hull	LIVELLO IN USCITA	[vector: polygon]	The output (convex hull) vector layer

23.1.15.12.3. Python code

Algorithm ID: qgis:convexhull

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.13. Create layer from extent

Creates a new vector layer that contains a single feature with geometry matching the extent of the input layer.

It can be used in models to convert a literal extent (xmin, xmax, ymin, ymax format) into a layer which can be used for other algorithms which require a layer based input.

Vedi anche

Create layer from point

23.1.15.13.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Extent (xmin, xmax, ymin, ymax)	IN INGRESSO	[estensione]	Input extent
Extent	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.13.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Extent	LIVELLO IN USCITA	[vector: polygon]	The output (extent) vector layer

23.1.15.13.3. Python code

Algorithm ID: qgis:extenttolayer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.14. Create layer from point

Creates a new vector layer that contains a single feature with geometry matching a point parameter. It can be used in models to convert a point into a point layer for algorithms which require a layer based input.

Vedi anche

Create layer from extent

23.1.15.14.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Point	IN INGRESSO	[coordinates]	Input point, including CRS info (example: 397254,6214446 [EPSG:32632]). If the CRS is not provided, the Project CRS will be used. The point can be specified by clicking on the map canvas.
Point	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.14.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Point	LIVELLO IN USCITA	[vettore: punto]	The output point vector layer containing the input point.

23.1.15.14.3. Python code

Algorithm ID: qgis:pointtolayer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.15. Create wedge buffers

Creates wedge shaped buffers from input points.

Fig. 23.36 Wedge buffers

The native output from this algorithm are CurvePolygon geometries, but these may be automatically segmentized to Polygons depending on the output format.

Vedi anche

Buffer, Variable width buffer (by M value), Tapered buffers

23.1.15.15.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: punto]	Input point vector layer
Azimuth (degrees from North)	AZIMUTH	[number ] Default: 0.0	Angle (in degrees) as the middle value of the wedge
Wedge width (in degrees)	LARGHEZZA	[number ] Default: 45.0	Width (in degrees) of the buffer. The wedge will extend to half of the angular width either side of the azimuth direction. Fig. 23.37 Azimuth and width values of the wedge buffer
Outer radius	OUTER_RADIUS	[number ] Default: 1.0	The outer size (length) of the wedge: the size is meant from the source point to the edge of the wedge shape.
Inner radius Optional	INNER_RADIUS	[number ] Default: 0.0	Inner radius value. If 0 the wedge will begin from the source point.
Buffers	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.15.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Buffers	LIVELLO IN USCITA	[vector: polygon]	The output (wedge buffer) vector layer

23.1.15.15.3. Python code

Algorithm ID: qgis:wedgebuffers

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.16. Delaunay triangulation

Creates a polygon layer with the Delaunay triangulation corresponding to the input point layer.

Fig. 23.38 Delaunay triangulation on points

Menu predefinito: Vettore ▶ Strumenti di Geometria

23.1.15.16.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: punto]	Input point vector layer
Delaunay triangulation	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.16.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Delaunay triangulation	LIVELLO IN USCITA	[vector: polygon]	The output (Delaunay triangulation) vector layer

23.1.15.16.3. Python code

Algorithm ID: qgis:delaunaytriangulation

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.17. Delete holes

Takes a polygon layer and removes holes in polygons. It creates a new vector layer in which polygons with holes have been replaced by polygons with only their external ring. Attributes are not modified.

An optional minimum area parameter allows removing only holes which are smaller than a specified area threshold. Leaving this parameter at 0.0 results in all holes being removed.

Fig. 23.39 Before and after the cleaning

Permette features in-place modification 1

23.1.15.17.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: polygon]	Input polygon vector layer
Remove holes with area less than Optional	MIN_AREA	[number ] Default: 0.0	Only holes with an area less than this threshold will be deleted. If 0.0 is added, all the holes will be deleted.
Cleaned	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.17.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Cleaned	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output (cleaned) vector layer

23.1.15.17.3. Python code

Algorithm ID: qgis:deleteholes

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.18. Densify by count

Takes a polygon or line layer and generates a new one in which the geometries have a larger number of vertices than the original one.

If the geometries have Z or M values present then these will be linearly interpolated at the added vertices.

The number of new vertices to add to each segment is specified as an input parameter.

Fig. 23.40 Red points show the vertices before and after the densify

Permette features in-place modification 1

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Densify by interval

23.1.15.18.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Vertices to add	VERTICES	[numero] Default: 1	Number of vertices to add to each segment
Densified	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.18.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Densified	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output (densified) vector layer

23.1.15.18.3. Python code

Algorithm ID: qgis:densifygeometries

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.19. Densify by interval

Takes a polygon or line layer and generates a new one in which the geometries have a larger number of vertices than the original one.

The geometries are densified by adding regularly placed extra vertices inside each segment so that the maximum distance between any two vertices does not exceed the specified distance.

If the geometries have Z or M values present then these will be linearly interpolated at the added vertices.

Example

Specifying a distance of 3 would cause the segment [0 0] -> [10 0] to be converted to [0 0] -> [2.5 0] -> [5 0] -> [7.5 0] -> [10 0], since 3 extra vertices are required on the segment and spacing these at 2.5 increments allows them to be evenly spaced over the segment.

Fig. 23.41 Densify geometry at a given interval

Permette features in-place modification 1

Vedi anche

Densify by count

23.1.15.19.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Interval between vertices to add	INTERVAL	[number ] Default: 1.0	Maximum distance between two consecutive vertices
Densified	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.19.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Densified	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output (densified) vector layer

23.1.15.19.3. Python code

Algorithm ID: qgis:densifygeometriesgivenaninterval

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.20. Dissolve

Takes a vector layer and combines its features into new features. One or more attributes can be specified to dissolve features belonging to the same class (having the same value for the specified attributes), alternatively all features can be dissolved to a single feature.

All output geometries will be converted to multi geometries. In case the input is a polygon layer, common boundaries of adjacent polygons being dissolved will get erased.

The resulting attribute table will have the same fields as the input layer. The values in the output layer’s fields are the ones of the first input feature that happens to be processed.

Fig. 23.42 Dissolve the polygon layer on a common attribute

Default menu: Vector ▶ Geoprocessing Tools

Vedi anche

Raggruppa geometrie, Collect geometries

23.1.15.20.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Dissolve field(s) Optional	FIELD	[tablefield: any] [list] Default: []	Features having the same value for the selected field(s) will be replaced with a single one and their geometries are merged. If no field is provided then all the features are dissolved, resulting in a single (multipart) feature.
Dissolved	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.20.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Dissolved	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer with dissolved geometries

23.1.15.20.3. Python code

Algorithm ID: qgis:dissolve

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.21. Drape (set Z value from raster)

Uses values sampled from a band within a raster layer to set the Z value for every overlapping vertex in the feature geometry. The raster values can optionally be scaled by a preset amount.

If Z values already exist in the layer, they will be overwritten with the new value. If no Z values exist, the geometry will be upgraded to include the Z dimension.

Vedi anche

Set M value from raster, Set Z value

23.1.15.21.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Raster layer	RASTER	[raster]	Raster layer with Z values
Band number	BAND	[raster band] Default: 1	The raster band to take the Z values from
Value for nodata or non-intersecting vertices	NODATA	[number ] Predefinito: 0	Value to use in case the vertex does not intersect (a valid pixel of) the raster
Scale factor	SCALE	[number ] Default: 1.0	Scaling value: the band values are multiplied by this value.
Updated	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer (with Z values from the raster layer). One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.21.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Updated	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer with Z values from the raster layer

23.1.15.21.3. Python code

Algorithm ID: qgis:setzfromraster

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.22. Drop M/Z values

Removes M (measure) or Z (altitude) values from input geometries.

Vedi anche

Set M value, Set Z value

23.1.15.22.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Input vector layer with M or Z values
Drop M Values	DROP_M_VALUES	[boolean] Default: False	Removes the M values from the geometries
Drop Z Values	DROP_Z_VALUES	[boolean] Default: False	Removes the Z values from the geometries
Z/M Dropped	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.22.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Z/M Dropped	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer (identical to the input layer, except that the M and/or Z dimensions have been removed from the geometries).

23.1.15.22.3. Python code

Algorithm ID: qgis:dropmzvalues

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.23. Eliminate selected polygons

Combines selected polygons of the input layer with certain adjacent polygons by erasing their common boundary. The adjacent polygon can be either the one with the largest or smallest area or the one sharing the largest common boundary with the polygon to be eliminated.

Eliminate is normally used to get rid of sliver polygons, i.e. tiny polygons that are a result of polygon intersection processes where boundaries of the inputs are similar but not identical.

Default menu: Vector ▶ Geoprocessing Tools

Vedi anche

Fix geometries

23.1.15.23.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: polygon]	Input polygon vector layer
Merge selection with the neighboring polygon with the	MODE	[numero] Default: None	Choose the parameter to use in order to get rid of the selected polygons: 0 — Largest Area 1 — Smallest Area 2 — Largest Common Boundary
Eliminated	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.23.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Eliminated	LIVELLO IN USCITA	[vector: polygon]	The output polygon vector layer.

23.1.15.23.3. Python code

Algorithm ID: qgis:eliminateselectedpolygons

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.24. Explode lines

Takes a lines layer and creates a new one in which each line layer is replaced by a set of lines representing the segments in the original line.

Each line in the resulting layer contains only a start and an end point, with no intermediate vertices between them.

Fig. 23.43 The original line layer and the exploded one

Permette features in-place modification 1

Vedi anche

Subdivide, Line substring

23.1.15.24.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Exploded	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.24.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Exploded	LIVELLO IN USCITA	[vector: line]	The output line vector layer with features representing each segment of the input layer.

23.1.15.24.3. Python code

Algorithm ID: qgis:explodelines

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.25. Extend lines

Extends line geometry by a specified amount at the start and end of the line.

Lines are extended using the bearing of the first and last segment in the line.

Fig. 23.44 The red dashes represent the initial and final extension of the original layer

Permette features in-place modification 1

Vedi anche

Line substring

23.1.15.25.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Start distance	START_DISTANCE	[number ]	Distance by which to extend the first segment of the line (starting point)
End distance	END_DISTANCE	[number ]	Distance by which to extend the last segment of the line (ending point)
Extended	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.25.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Extended	LIVELLO IN USCITA	[vector: line]	The output (extended) line vector layer.

23.1.15.25.3. Python code

Algorithm ID: qgis:extendlines

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.26. Extract M values

Extracts M values from geometries into feature attributes.

By default only the M value from the first vertex of each feature is extracted, however the algorithm can optionally calculate statistics on all of the geometry’s M values, including sum, mean, minimum and maximum.

Vedi anche

Extract Z values, Set M value, Drop M/Z values

23.1.15.26.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Summaries to calculate	SUMMARIES	[numero] Default: [0]	Statistics on the M values of a geometry. One or more of: 0 — First 1 — Last 2 — Count 3 — Sum 4 — Mean 5 — Median 6 — St.dev (pop) 7 — Minimum 8 — Maximum 9 — Range 10 — Minority 11 — Majority 12 — Variety 13 — Q1 14 — Q3 15 — IQR
Output column prefix	COLUMN_PREFIX	[stringa] Default: “m_”	The prefix for the output (M) column
Extracted	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.26.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Extracted	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer (with M values)

23.1.15.26.3. Python code

Algorithm ID: qgis:extractmvalues

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.27. Extract specific vertices

Takes a vector layer and generates a point layer with points representing specific vertices in the input geometries.

For instance, this algorithm can be used to extract the first or last vertices in the geometry. The attributes associated to each point are the same ones associated to the feature that the vertex belongs to.

The vertex indices parameter accepts a comma separated string specifying the indices of the vertices to extract. The first vertex corresponds to an index of 0, the second vertex has an index of 1, etc. Negative indices can be used to find vertices at the end of the geometry, e.g., an index of -1 corresponds to the last vertex, -2 corresponds to the second last vertex, etc.

Additional fields are added to the vertices indicating the specific vertex position (e.g., 0, -1, etc), the original vertex index, the vertex’s part and its index within the part (as well as its ring for polygons), distance along the original geometry and bisector angle of vertex for the original geometry.

Vedi anche

Extract vertices, Filter vertices by M value, Filter vertices by Z value

23.1.15.27.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Vertex indices	VERTICES	[stringa] Default: “0”	Comma-separated string of the indices of the vertices to extract.
Vertices	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.27.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Vertices	LIVELLO IN USCITA	[vettore: punto]	The output (point) vector layer containing the specified vertices from the input layer geometries.

23.1.15.27.3. Python code

Algorithm ID: qgis:extractspecificvertices

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.28. Extract vertices

Takes a vector layer and generates a point layer with points representing the vertices in the input geometries.

The attributes associated to each point are the same ones associated to the feature that the vertex belongs to.

Additional fields are added to the vertices indicating the vertex index (beginning at 0), the feature’s part and its index within the part (as well as its ring for polygons), distance along original geometry and bisector angle of vertex for original geometry.

Fig. 23.45 Vertices extracted for line and polygon layer

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Extract specific vertices, Filter vertices by M value, Filter vertices by Z value

23.1.15.28.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Vertices	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.28.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Vertices	LIVELLO IN USCITA	[vettore: punto]	The output (point) vector layer containing the vertices from the input layer geometries.

23.1.15.28.3. Python code

Algorithm ID: qgis:extractvertices

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.29. Extract Z values

Extracts Z values from geometries into feature attributes.

By default only the Z value from the first vertex of each feature is extracted, however the algorithm can optionally calculate statistics on all of the geometry’s Z values, including sum, mean, minimum and maximum.

Vedi anche

Extract M values, Set Z value, Drop M/Z values

23.1.15.29.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Summaries to calculate	SUMMARIES	[numero] Default: [0]	Statistics on the Z values of a geometry. One or more of: 0 — First 1 — Last 2 — Count 3 — Sum 4 — Mean 5 — Median 6 — St.dev (pop) 7 — Minimum 8 — Maximum 9 — Range 10 — Minority 11 — Majority 12 — Variety 13 — Q1 14 — Q3 15 — IQR
Output column prefix	COLUMN_PREFIX	[stringa] Default: “z_”	The prefix for the output (Z) column
Extracted	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.29.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Extracted	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer (with Z values)

23.1.15.29.3. Python code

Algorithm ID: qgis:extractzvalues

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.30. Filter vertices by M value

Filters away vertices based on their M value, returning geometries with only vertex points that have a M value greater than or equal to the specified minimum value and/or less than or equal to the maximum value.

If the minimum value is not specified then only the maximum value is tested, and similarly if the maximum value is not specified then only the minimum value is tested.

Fig. 23.46 The red line represents the black line with only vertices whose M value is <=10.

Nota

Depending on the input geometry attributes and the filters used, the resultant geometries created by this algorithm may no longer be valid.

Vedi anche

Filter vertices by Z value, Extract vertices, Extract specific vertices

23.1.15.30.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer to remove vertices from
Minimum Optional	MIN	[number ] Default: Not set	Minimum of M values allowed
Maximum Optional	MAX	[number ] Default: Not set	Maximum of M values allowed
Filtered	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.30.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Filtered	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer of features with only the filtered vertices.

23.1.15.30.3. Python code

Algorithm ID: qgis:filterverticesbym

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.31. Filter vertices by Z value

Filters away vertices based on their Z value, returning geometries with only vertex points that have a Z value greater than or equal to the specified minimum value and/or less than or equal to the maximum value.

If the minimum value is not specified then only the maximum value is tested, and similarly if the maximum value is not specified then only the minimum value is tested.

Fig. 23.47 The red line represents the black line with only vertices whose Z value is <=10.

Nota

Depending on the input geometry attributes and the filters used, the resultant geometries created by this algorithm may no longer be valid. You may need to run the Fix geometries algorithm to ensure their validity.

Vedi anche

Filter vertices by M value, Extract vertices, Extract specific vertices

23.1.15.31.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer to remove vertices from
Minimum Optional	MIN	[number ] Default: Not set	Minimum of Z values allowed
Maximum Optional	MAX	[number ] Default: Not set	Maximum of Z values allowed
Filtered	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.31.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Filtered	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer of features with only the filtered vertices.

23.1.15.31.3. Python code

Algorithm ID: qgis:filterverticesbyz

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.32. Fix geometries

Attempts to create a valid representation of a given invalid geometry without losing any of the input vertices. Already valid geometries are returned without further intervention. Always outputs multi-geometry layer.

Nota

M values will be dropped from the output.

Permette features in-place modification 1

Vedi anche

Controllo validità

23.1.15.32.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Fixed geometries	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.32.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Fixed geometries	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer with fixed geometries.

23.1.15.32.3. Python code

Algorithm ID: qgis:fixgeometries

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.33. Force right-hand-rule

Forces polygon geometries to respect the Right-Hand-Rule, in which the area that is bounded by a polygon is to the right of the boundary. In particular, the exterior ring is oriented in a clockwise direction and any interior rings in a counter-clockwise direction.

23.1.15.33.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: polygon]	Livello vettoriale in ingresso
Reoriented	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.33.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Reoriented	LIVELLO IN USCITA	[vector: polygon]	The output vector layer with reoriented geometries.

23.1.15.33.3. Python code

Algorithm ID: qgis:forcerhr

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.34. Geodesic line split at antimeridian

Splits a line into multiple geodesic segments, whenever the line crosses the antimeridian (±180 degrees longitude).

Splitting at the antimeridian helps the visual display of the lines in some projections. The returned geometry will always be a multi-part geometry.

Whenever line segments in the input geometry cross the antimeridian, they will be split into two segments, with the latitude of the breakpoint being determined using a geodesic line connecting the points either side of this segment. The current project ellipsoid setting will be used when calculating this breakpoint.

If the input geometry contains M or Z values, these will be linearly interpolated for the new vertices created at the antimeridian.

23.1.15.34.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Split	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output line vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.34.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Split	LIVELLO IN USCITA	[vector: line]	The output line vector layer split at the antimeridian.

23.1.15.34.3. Python code

Algorithm ID: qgis:antimeridiansplit

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.35. Geometry by expression

Updates existing geometries (or creates new geometries) for input features by use of a QGIS expression.

This allows complex geometry modifications which can utilize all the flexibility of the QGIS expression engine to manipulate and create geometries for output features.

For help with QGIS expression functions, see the inbuilt help available in the expression builder.

23.1.15.35.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Output geometry type	OUTPUT_GEOMETRY	[numero] Predefinito: 0	The output geometry strongly depends on the expression: for instance, if you create a buffer the geometry type has to be polygon. One of: 0 — Polygon 1 — Line 2 — Point
Output geometry has z values	WITH_Z	[boolean] Default: False	Choose if the output geometry should include the Z dimension
Output geometry has m values	WITH_M	[boolean] Default: False	Choose if the output geometry should include the M dimension
Geometry expression	EXPRESSION	[expression] Default: “$geometry”	Add the geometry expression you want to use. You can use the button to open the Expression Dialog. The dialog lists all the relevant expressions, together with their help and guide.
Modified geometry	LIVELLO IN USCITA	[vettore: qualsiasi] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.35.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Modified geometry	LIVELLO IN USCITA	[vettore: qualsiasi]	Livello vettoriale in uscita

23.1.15.35.3. Python code

Algorithm ID: qgis:geometrybyexpression

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.36. Interpolate point on line

Creates a point geometry interpolated at a set distance along line or curve geometries.

Z and M values are linearly interpolated from existing values.

If a multipart geometry is encountered, only the first part is considered when calculating the substring.

If the specified distance is greater than the input feature’s length, the resultant feature will have a null geometry.

Fig. 23.48 Interpolated point at 500m of the beginning of the line

Vedi anche

Points along geometry

23.1.15.36.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Distance	DISTANCE	[number ] Default: 0.0	Distance from the beginning of the line
Interpolated points	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.36.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Interpolated points	LIVELLO IN USCITA	[vettore: punto]	The output point vector layer with features at a set distance along the line or polygon boundary

23.1.15.36.3. Python code

Algorithm ID: qgis:interpolatepoint

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.37. Keep N biggest parts

Takes a layer with polygons or multipolygons and returns a new layer in which only the n largest polygons of each multipolygon feature are kept. If a feature has n or fewer parts, the feature will just be copied.

Fig. 23.49 Clockwise from top left: original multipart feature, one, two and three biggest parts kept

23.1.15.37.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Polygons	IN INGRESSO	[vector: polygon]	Input polygon vector layer
Parts to keep	PARTS	[numero] Default: 1	Number of parts to keep. If 1, only the biggest part of the feature will be kept.
Parts	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.37.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Parts	LIVELLO IN USCITA	[vector: polygon]	The output polygon vector layer with the N biggest parts of each feature

23.1.15.37.3. Python code

Algorithm ID: qgis:keepnbiggestparts

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.38. Line substring

Returns the portion of a line (or curve) which falls between the specified start and end distances (measured from the beginning of the line).

Z and M values are linearly interpolated from existing values.

If a multipart geometry is encountered, only the first part is considered when calculating the substring.

Fig. 23.50 Substring line with starting distance set at 0 meters and the ending distance at 250 meters.

Permette features in-place modification 1

Vedi anche

Extend lines

23.1.15.38.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Start distance	START_DISTANCE	[number ]	Distance along the input line to the start point of the output feature
End distance	END_DISTANCE	[number ]	Distance along the input line to the end point of the output feature
Substring	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output line vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.38.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Substring	LIVELLO IN USCITA	[vector: line]	The output line vector layer.

23.1.15.38.3. Python code

Algorithm ID: qgis:linesubstring

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.39. Lines to polygons

Generates a polygon layer using as polygon rings the lines from an input line layer.

The attribute table of the output layer is the same as the one from of the input line layer.

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Polygons to lines, Polygonize

23.1.15.39.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Polygons	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.39.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Polygons	LIVELLO IN USCITA	[vector: polygon]	The output polygon vector layer.

23.1.15.39.3. Python code

Algorithm ID: qgis:linestopolygons

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.40. Merge lines

Joins all connected parts of MultiLineString geometries into single LineString geometries.

If any parts of the input MultiLineString geometries are not connected, the resultant geometry will be a MultiLineString containing any lines which could be merged and any non-connected line parts.

Permette features in-place modification 1

23.1.15.40.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Merged	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output line vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.40.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Merged	LIVELLO IN USCITA	[vector: line]	The output (merged) line vector layer.

23.1.15.40.3. Python code

Algorithm ID: qgis:mergelines

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.41. Minimum bounding geometry

Creates geometries which enclose the features from an input layer. The features can be grouped by a field. The output layer will then contain one feature per group value with a geometry (MBB) that covers the geometries of the features with matching value.

The following enclosing geometry types are supported:

• bounding box (envelope)

• oriented rectangle

• circle

• convex hull

Fig. 23.51 Clockwise from top left: envelope, oriented rectangle, circle, convex hull

Vedi anche

Minimum enclosing circles

23.1.15.41.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Field Optional	FIELD	[tablefield: any]	Features can be grouped by a field. If set, this causes the output layer to contain one feature per grouped value with a minimal geometry covering only the features with matching values.
Geometry type	TYPE	[numero] Predefinito: 0	Enclosing geometry types. One of: 0 — Envelope (Bounding Box) 1 — Minimum Oriented Rectangle 2 — Minimum Enclosing Circle 3 — Convex Hull
Bounding geometry	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.41.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Bounding geometry	LIVELLO IN USCITA	[vector: polygon]	The output (bounding) polygon vector layer.

23.1.15.41.3. Python code

Algorithm ID: qgis:minimumboundinggeometry

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.42. Minimum enclosing circles

Calculates the minimum enclosing circles of the features in the input layer.

Fig. 23.52 Enclosing circles for each feature

Permette features in-place modification 1

Vedi anche

Minimum bounding geometry

23.1.15.42.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Number of segment in circles	SEGMENTS	[numero] Default: 72	The number of segment used to approximate a circle. Minimum 8, maximum 100000.
Minimum enclosing circles	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.42.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Minimum enclosing circles	LIVELLO IN USCITA	[vector: polygon]	The output polygon vector layer.

23.1.15.42.3. Python code

Algorithm ID: qgis:minimumenclosingcircle

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.43. Multi-ring buffer (constant distance)

Computes multi-ring (donut) buffer for the features of the input layer, using a fixed or dynamic distance and number of rings.

Fig. 23.53 Multi-ring buffer for a line, point and polygon layer

Permette features in-place modification 1

Vedi anche

Buffer, Variable distance buffer, Rectangles, ovals, diamonds (fixed), Rectangles, ovals, diamonds (variable), Single sided buffer

23.1.15.43.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Number of rings	RINGS	[number ] Default: 1	The number of rings. It can be a unique value (same number of rings for all the features) or it can be taken from features data (the number of rings depends on feature values).
Distance between rings	DISTANCE	[number ] Default: 1.0	Distance between the rings. It can be a unique value (same distance for all the features) or it can be taken from features data (the distance depends on feature values).
Multi-ring buffer (constant distance)	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.43.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Multi-ring buffer (constant distance)	LIVELLO IN USCITA	[vector: polygon]	The output polygon vector layer.

23.1.15.43.3. Python code

Algorithm ID: qgis:multiringconstantbuffer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.44. Multipart to singleparts

Splits multipart features in the input layer into singlepart features.

The attributes of the output layer are the same as the original ones but divided into single features.

Fig. 23.54 Left the multipart source layer and right the single part output result

Permette features in-place modification 1

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Collect geometries, Promote to multipart

23.1.15.44.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Single parts	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.44.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Single parts	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer.

23.1.15.44.3. Python code

Algorithm ID: qgis:multiparttosingleparts

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.45. Offset lines

Offsets lines by a specified distance. Positive distances will offset lines to the left, and negative distances will offset them to the right.

Fig. 23.55 In blue the source layer, in red the offset one

Permette features in-place modification 1

Vedi anche

Array of offset (parallel) lines, Translate

23.1.15.45.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Distance	DISTANCE	[number ] Default: 10.0	Offset distance. You can use the Data Defined button on the right to choose a field from which the radius will be calculated. This way you can have different radius for each feature (see Variable distance buffer).
Segments	SEGMENTS	[numero] Default: 8	Controlla il numero di segmenti di linea da usare per approssimare un quarto di cerchio quando si creano offset arrotondati.
Join style	JOIN_STYLE	[numero] Predefinito: 0	Specifica se devono essere utilizzati stile di unione di tipo arrotondato, seghettato o smussato quando si esegue l’offset degli angoli in una linea. Le opzioni sono: 0 — Arrotondato 1 — Seghettato 2 — Smussato
Miter limit	MITER_LIMIT	[numero] Default: 2.0	Controls the maximum distance from the offset curve to use when creating a mitered join (only applicable for miter join styles). Minimum: 1.
Offset	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output (offset) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.45.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Offset	LIVELLO IN USCITA	[vector: line]	Output (offset) line layer

23.1.15.45.3. Python code

Algorithm ID: qgis:offsetline

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.46. Oriented minimum bounding box

Calculates the minimum area rotated rectangle for each feature in the input layer.

Fig. 23.56 Oriented minimum bounding box

Permette features in-place modification 1

Vedi anche

Minimum bounding geometry

23.1.15.46.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Bounding boxes	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.46.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Bounding boxes	LIVELLO IN USCITA	[vector: polygon]	The output polygon vector layer.

23.1.15.46.3. Python code

Algorithm ID: qgis:orientedminimumboundingbox

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.47. Orthogonalize

Attempts to orthogonalize the geometries of the input line or polygon layer. This process shifts the vertices in the geometries to try to make every angle in the geometry either a right angle or a straight line.

Fig. 23.57 In blue the source layer and in the red orthogonalized result

Permette features in-place modification 1

23.1.15.47.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Maximum angle tolerance (degrees)	ANGLE_TOLERANCE	[numero] Default: 15	Specify the maximum deviation from a right angle or straight line a vertex can have for it to be adjusted. Smaller tolerances mean that only vertices which are already closer to right angles will be adjusted, and larger tolerances mean that vertices which deviate further from right angles will also be adjusted.
Maximum algorithm iterations	MAX_ITERATIONS	[numero] Default: 1000	Setting a larger number for the maximum number of iterations will result in a more orthogonal geometry at the cost of extra processing time.
Orthogonalized	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.47.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Orthogonalized	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output polygon vector layer with adjusted angles.

23.1.15.47.3. Python code

Algorithm ID: qgis:orthogonalize

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.48. Point on Surface

For each feature of the input layer, returns a point that is guaranteed to lie on the surface of the feature geometry.

Permette features in-place modification 1

Vedi anche

Centroidi

23.1.15.48.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Create point on surface for each part	ANGLE_TOLERANCE	[boolean ]	If checked, a point will be created for each part of the geometry.
Point	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output point vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.48.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Point	LIVELLO IN USCITA	[vettore: punto]	The output point vector layer.

23.1.15.48.3. Python code

Algorithm ID: qgis:pointonsurface

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.49. Points along geometry

Creates points at regular intervals along line or polygon geometries. Created points will have new attributes added for the distance along the geometry and the angle of the line at the point.

An optional start and end offset can be specified, which controls how far from the start and end of the geometry the points should be created.

Fig. 23.58 Points created along the source line layer

Vedi anche

Interpolate point on line

23.1.15.49.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Distance	DISTANCE	[number ] Default: 1.0	Distance between two consecutive points along the line
Start offset	START_OFFSET	[number ] Default: 0.0	Distance from the beginning of the input line, representing the position of the first point.
End offset	END_OFFSET	[number ] Default: 0.0	Distance from the end of the input line, representing the position beyond which no point feature shoud be created.
Interpolated points	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.49.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Interpolated points	LIVELLO IN USCITA	[vettore: punto]	Point vector layer with features placed along lines or polygon boundaries of the input layer.

23.1.15.49.3. Python code

Algorithm ID: qgis:pointsalonglines

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.50. Points displacement

Given a distance of proximity, identifies nearby point features and radially distributes them over a circle whose center represents their barycenter. A convenient tool to scatter overlaid features.

23.1.15.50.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: punto]	Input point vector layer
Minimum distance to other points	PROXIMITY	[numero] Default: 1.0	Distance below which point features are considered close. Close features are distributed altogether.
Displacement distance	DISTANCE	[numero] Default: 1.0	Radius of the circle on which close features are placed
Horizontal distribution for two point case	HORIZONTAL	[boolean] Default: False	When only two points are identified as close, aligns them horizontally on the circle instead of vertically.
Displaced	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.50.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Displaced	LIVELLO IN USCITA	[vettore: punto]	Output point vector layer

23.1.15.50.3. Python code

Algorithm ID: qgis:pointsdisplacement

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.51. Pole of inaccessibility

Calculates the pole of inaccessibility for a polygon layer, which is the most distant internal point from the boundary of the surface.

This algorithm uses the “polylabel” algorithm (Vladimir Agafonkin, 2016), which is an iterative approach guaranteed to find the true pole of inaccessibility within a specified tolerance. A more precise tolerance (lower value) requires more iterations and will take longer to calculate.

The distance from the calculated pole to the polygon boundary will be stored as a new attribute in the output layer.

Fig. 23.59 Pole of inaccessibility

23.1.15.51.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: polygon]	Livello vettoriale in ingresso
Tolerance	TOLERANCE	[numero] Default: 1.0	Set the tolerance for the calculation
Point	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.51.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Point	LIVELLO IN USCITA	[vettore: punto]	The output point vector layer

23.1.15.51.3. Python code

Algorithm ID: qgis:poleofinaccessibility

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.52. Polygonize

Creates a polygon layer whose features boundaries are generated from a line layer of closed features.

Fig. 23.60 The yellow polygons generated from the closed lines

Nota

The line layer must have closed shapes in order to be transformed into a polygon.

Vedi anche

Polygons to lines

23.1.15.52.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Keep table structure of line layer Optional	KEEP_FIELDS	[boolean] Default: False	Check to copy the original attributes of the input layer
Polygons from lines	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output polygon vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.52.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Polygons from lines	LIVELLO IN USCITA	[vector: polygon]	The output polygon vector layer from lines

23.1.15.52.3. Python code

Algorithm ID: qgis:polygonize

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.53. Polygons to lines

Takes a polygon layer and creates a line layer, with lines representing the boundaries of the polygons in the input layer.

Fig. 23.61 Black lines as the result of the algorithm

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Polygonize

23.1.15.53.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: polygon]	Input polygon vector layer
Lines	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output line vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.53.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Lines	LIVELLO IN USCITA	[vector: line]	The output line vector layer from polygons

23.1.15.53.3. Python code

Algorithm ID: qgis:polygonstolines

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.54. Project points (Cartesian)

Projects point geometries by a specified distance and bearing (azimuth).

Permette features in-place modification 1

23.1.15.54.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: punto]	Input point vector layer
Bearing (degrees from North)	BEARING	[number ] Default: 0.0	Clockwise angle starting from North, in degree (°) unit
Distance	DISTANCE	[number ] Default: 1.0	Distance to offset geometries, in layer units
Projected	LIVELLO IN USCITA	[vettore: punto] Predefinito: [Crea livello temporaneo]	Specify the output point vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.54.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Projected	LIVELLO IN USCITA	[vettore: punto]	The output (projected) point vector layer

23.1.15.54.3. Python code

Algorithm ID: qgis:projectpointcartesian

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.55. Promote to multipart

Takes a vector layer with singlepart geometries and generates a new one in which all geometries are multipart.

Input features which are already multipart features will remain unchanged.

This algorithm can be used to force geometries to multipart types in order to be compatible with data providers that require multipart features.

Permette features in-place modification 1

Vedi anche

Raggruppa geometrie, Collect geometries

23.1.15.55.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Multiparts	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output multipart vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.55.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Multiparts	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output multipart vector layer

23.1.15.55.3. Python code

Algorithm ID: qgis:promotetomulti

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.56. Rectangles, ovals, diamonds (fixed)

Creates a buffer area for all the features in an input layer with different shape choice.

Parameters can vary depending on the shape chosen.

Fig. 23.62 Different buffer shapes

Vedi anche

Rectangles, ovals, diamonds (variable)

23.1.15.56.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: punto]	Input point vector layer
Buffer shape	SHAPE	[numero]	The shape to use. One of: 0 — Rectangles 1 — Ovals 2 — Diamonds
Width	LARGHEZZA	[numero] Default: 1.0	Width of the buffer shape
Height	ALTEZZA	[numero] Default: 1.0	Height of the buffer shape
Rotation Optional	ROTATION	[numero] Default: None	Rotation of the buffer shape
Number of segment	SEGMENTS	[numero] Default: 36	Number of segments for a full circle (Ovals shape)
Output	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.56.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Output	LIVELLO IN USCITA	[vector: polygon]	The output vector layer (with the buffer shapes)

23.1.15.56.3. Python code

Algorithm ID: qgis:rectanglesovalsdiamonds

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.57. Rectangles, ovals, diamonds (variable)

Creates a buffer area for all the features in an input layer with different shape choice.

Buffer shape parameters are specified through attribute of the input layer.

Fig. 23.63 Different buffer shapes with different parameters

Vedi anche

Rectangles, ovals, diamonds (fixed)

23.1.15.57.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: punto]	Input point vector layer
Buffer shape	SHAPE	[numero] Predefinito: 0	The shape to use. One of: 0 — Rectangles 1 — Ovals 2 — Diamonds
Width field	LARGHEZZA	[tablefield: numeric] Default: First	Width of the buffer shape
Height field	ALTEZZA	[tablefield: numeric] Default: First	Height of the buffer shape
Rotation field Optional	ROTATION	[tablefield: numeric]	Rotation of the buffer shape
Number of segment	SEGMENTS	[numero] Default: 36	Number of segments for a full circle (Ovals shape)
Output	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.57.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Output	LIVELLO IN USCITA	[vector: polygon]	The output vector layer (with the buffer shapes)

23.1.15.58. Remove duplicate vertices

Removes duplicate vertices from features, wherever removing the vertices does not result in a degenerate geometry.

The tolerance parameter specifies the tolerance for coordinates when determining whether vertices are identical.

By default, Z values are not considered when detecting duplicate vertices. E.g. two vertices with the same X and Y coordinate but different Z values will still be considered duplicate and one will be removed. If the Use Z Value parameter is true, then the Z values are also tested and vertices with the same X and Y but different Z will be maintained.

Nota

Duplicate vertices are not tested between different parts of a multipart geometry, e.g. a multipoint geometry with overlapping points will not be changed by this method.

Permette features in-place modification 1

Vedi anche

Extract vertices, Extract specific vertices, Delete duplicate geometries

23.1.15.58.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Tolerance	TOLERANCE	[number ] Default: 0.000001	Vertices closer than the specified distance are considered duplicates
Use Z value	USE_Z_VALUE	[boolean ] Default: False	If the Use Z Value parameter is true, then the Z values are also tested and vertices with the same X and Y but different Z will be maintained.
Cleaned	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.58.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Cleaned	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer (without duplicate vertices)

23.1.15.58.3. Python code

Algorithm ID: qgis:removeduplicatevertices

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.59. Remove null geometries

Removes any features which do not have a geometry from a vector layer.

All other features will be copied unchanged.

The features with null geometries can be saved to a separate layer.

Vedi anche

Delete duplicate geometries

23.1.15.59.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Input vector layer (with non-NULL geometries)
Non null geometries	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer for the non-NULL geometries. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.
Null geometries	NULL_OUTPUT	[lo stesso del livello in ingresso] Default: [Skip output]	Specify the output vector layer for the NULL geometries. One of: Skip Output Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.59.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Null geometries	NULL_OUTPUT	[lo stesso del livello in ingresso]	The output vector layer (only NULL geometries)
Non null geometries	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer (without NULL geometries)

23.1.15.59.3. Python code

Algorithm ID: qgis:removenullgeometries

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.60. Reverse line direction

Inverts the direction of a line layer.

Fig. 23.64 Before and after the direction inversion

Permette features in-place modification 1

23.1.15.60.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Reversed	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output line vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.60.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Reversed	LIVELLO IN USCITA	[vector: line]	The output line vector layer (with reversed lines)

23.1.15.60.3. Python code

Algorithm ID: qgis:reverselinedirection

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.61. Rotate

Rotates feature geometries by the specified angle clockwise. The rotation occurs around each feature’s centroid, or optionally around a unique preset point.

Permette features in-place modification 1

Vedi anche

Translate, Swap X and Y coordinates

23.1.15.61.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Rotation (degrees clockwise)	ANGLE	[number ] Default: 0.0	Angle of the rotation in degrees
Rotation anchor point (x, y) Optional	ANCHOR	[point] Default: None	X,Y coordinates of the point to rotate the features around. If not set the rotation occurs around each feature’s centroid.
Rotated	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer (with rotated geometries). One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.61.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Rotated	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer with rotated geometries

23.1.15.61.3. Python code

Algorithm ID: qgis:rotatefeatures

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.62. Segmentize by maximum angle

Segmentizes a geometry by converting curved sections to linear sections.

The segmentization is performed by specifying the maximum allowed radius angle between vertices on the straightened geometry (e.g the angle of the arc created from the original arc center to consecutive output vertices on the linearized geometry). Non-curved geometries will be retained without change.

Vedi anche

Segmentize by maximum distance, Simplify, Smooth

23.1.15.62.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Maximum angle between vertices (degrees)	ANGLE	[number ] Default: 5.0	Maximum allowed radius angle between vertices on the straightened geometry
Segmentized	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer (with segmentized geometries). One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.62.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Segmentized	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer with segmentized geometries

23.1.15.62.3. Python code

Algorithm ID: qgis:segmentizebymaxangle

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.63. Segmentize by maximum distance

Segmentizes a geometry by converting curved sections to linear sections.

The segmentization is performed by specifying the maximum allowed offset distance between the original curve and the segmentized representation. Non-curved geometries will be retained without change.

Vedi anche

Segmentize by maximum angle, Simplify, Smooth

23.1.15.63.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Maximum offset distance	DISTANCE	[number ] Default: 1.0	Maximum allowed offset distance between the original curve and the segmentized representation, in the layer units.
Segmentized	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer (with segmentized geometries). One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.63.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Segmentized	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer with segmentized geometries

23.1.15.63.3. Python code

Algorithm ID: qgis:segmentizebymaxdistance

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.64. Set M value

Sets the M value for geometries in a layer.

If M values already exist in the layer, they will be overwritten with the new value. If no M values exist, the geometry will be upgraded to include M values and the specified value used as the initial M value for all geometries.

Suggerimento

Use the ^{Identify Features} button to check the added M value: the results are available in the Identify Results dialog.

Vedi anche

Set M value from raster, Set Z value, Drop M/Z values

23.1.15.64.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
M Value	M_VALUE	[number ] Default: 0.0	M value to assign to the feature geometries
M Added	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.64.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
M Added	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer (with M values assigned to the geometries)

23.1.15.64.3. Python code

Algorithm ID: qgis:setmvalue

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.65. Set M value from raster

Uses values sampled from a band within a raster layer to set the M value for every overlapping vertex in the feature geometry. The raster values can optionally be scaled by a preset amount.

If M values already exist in the layer, they will be overwritten with the new value. If no M values exist, the geometry will be upgraded to include M values.

Vedi anche

Drape (set Z value from raster), Set M value

23.1.15.65.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Raster layer	RASTER	[raster]	Raster layer with M values
Band number	BAND	[raster band] Default: 1	The raster band from which the M values are taken
Value for nodata or non-intersecting vertices	NODATA	[number ] Default: 0.0	Value to use in case the vertex does not intersect (a valid pixel of) the raster
Scale factor	SCALE	[number ] Default: 1.0	Scaling value: the band values are multiplied by this value.
Updated	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer (with updated M values). One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.65.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Updated	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer (with updated M values)

23.1.15.65.3. Python code

Algorithm ID: qgis:setmfromraster

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.66. Set Z value

Sets the Z value for geometries in a layer.

If Z values already exist in the layer, they will be overwritten with the new value. If no Z values exist, the geometry will be upgraded to include Z values and the specified value used as the initial Z value for all geometries.

Suggerimento

Use the ^{Identify Features} button to check the added Z value: the results are available in the Identify Results dialog.

Vedi anche

Drape (set Z value from raster), Set M value, Drop M/Z values

23.1.15.66.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Z Value	Z_VALUE	[number ] Default: 0.0	Z value to assign to the feature geometries
Z Added	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.66.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Z Added	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output vector layer (with Z values assigned)

23.1.15.66.3. Python code

Algorithm ID: qgis:setzvalue

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.67. Simplify

Simplifies the geometries in a line or polygon layer. It creates a new layer with the same features as the ones in the input layer, but with geometries containing a lower number of vertices.

The algorithm gives a choice of simplification methods, including distance based (the «Douglas-Peucker» algorithm), area based («Visvalingam» algorithm) and snapping geometries to grid.

Fig. 23.65 Clockwise from top left: source layer and increasing simplification tolerances

Permette features in-place modification 1

Menu predefinito: Vettore ▶ Strumenti di Geometria

Vedi anche

Smooth, Densify by count, Densify by interval

23.1.15.67.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Simplification method	METHOD	[numero] Predefinito: 0	Simplification method. One of: 0 — Distance (Douglas-Peucker) 1 — Snap to grid 2 — Area (Visvalingam)
Tolerance	TOLERANCE	[number ] Default: 1.0	Threshold tolerance (in units of the layer): if the distance between two nodes is smaller than the tolerance value, the segment will be simplified and vertices will be removed.
Simplified	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output (simplified) vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.67.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Simplified	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	The output (simplified) vector layer

23.1.15.67.3. Python code

Algorithm ID: qgis:simplifygeometries

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.68. Single sided buffer

Computes a buffer on lines by a specified distance on one side of the line only.

Buffer always results in a polygon layer.

Fig. 23.66 Left versus right side buffer on the same vector line layer

Vedi anche

Buffer

23.1.15.68.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Distance	DISTANCE	[numero] Default: 10.0	Buffer distance.
Side	SIDE	[numero]	Which side to create the buffer on. One of: 0 – Left 1 – Right
Segments	SEGMENTS	[numero] Default: 8	Controlla il numero di segmenti di linea da usare per approssimare un quarto di cerchio quando si creano offset arrotondati.
Join style	JOIN_STYLE	[numero]	Specifica se devono essere utilizzati stile di unione di tipo arrotondato, seghettato o smussato quando si esegue l’offset degli angoli in una linea. Le opzioni sono: 0 — Arrotondato 1 — Seghettato 2 — Smussato
Miter limit	MITER_LIMIT	[numero] Default: 2.0	Controls the maximum distance from the offset curve to use when creating a mitered join (only applicable for miter join styles). Minimum: 1.0
Buffer	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output (buffer) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.68.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Buffer	LIVELLO IN USCITA	[vector: polygon]	Output (buffer) polygon layer

23.1.15.68.3. Python code

Algorithm ID: qgis:singlesidedbuffer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.69. Smooth

Smooths the geometries in a line or polygon layer by adding more vertices and corners to the feature geometries.

The iterations parameter dictates how many smoothing iterations will be applied to each geometry. A higher number of iterations results in smoother geometries with the cost of greater number of nodes in the geometries.

Fig. 23.67 Increasing number of iterations causes smoother geometries

The offset parameter controls how «tightly» the smoothed geometries follow the original geometries. Smaller values results in a tighter fit, and larger values will create a looser fit.

Fig. 23.68 Blue: the input layer. Offset 0.25 gives the red line, while offset 0.50 gives the green line.

The maximum angle parameter can be used to prevent smoothing of nodes with large angles. Any node where the angle of the segments to either side is larger than this will not be smoothed. For example, setting the maximum angle to 90 degrees or lower would preserve right angles in the geometry.

Permette features in-place modification 1

Vedi anche

Simplify, Densify by count, Densify by interval

23.1.15.69.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line, polygon]	Input line or polygon vector layer
Iterations	ITERATIONS	[number ] Default: 1	Increasing the number of iterations will give smoother geometries (and more vertices).
Offset	OFFSET	[number ] Default: 0.25	Increasing values will move the smoothed lines / boundaries further away from the input lines / boundaries.
Maximum node angle to smooth	MAX_ANGLE	[number ] Default: 180.0	Every node below this value will be smoothed
Smoothed	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output (smoothed) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.69.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Smoothed	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Output (smoothed) vector layer

23.1.15.69.3. Python code

Algorithm ID: qgis:smoothgeometry

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.70. Aggancia geometrie al vettore

Aggancia le geometrie in un vettore con quelle con quelle di un altro o con quelle all’interno dello stesso vettore.

Matching is done based on a tolerance distance, and vertices will be inserted or removed as required to make the geometries match the reference geometries.

Vedi anche

Aggancia punti alla griglia

23.1.15.70.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Reference layer	REFERENCE_LAYER	[vettore: qualsiasi]	Vector layer to snap to
Tolerance	TOLERANCE	[numero] Default: 10.0	Control how close input vertices need to be to the reference layer geometries before they are snapped.
Behavior*	BEHAVIOR	[numero] Predefinito: 0	Snapping can be done to an existing node or a segment (its closest point to the vertex to move). Available snapping options: 0 — Preferenza per allineamento di nodi, inserisci vertici dove richiesti 1 — Preferisci punto più vicino, inserisci vertici addizionali dove richiesti 2 — Preferisci nodi allineati, non aggiungere nuovi vertici 3 — Preferisci punto più vicino, non aggiungere nuovi vertici 4 — Sposta solo i punti finali, preferisci allineare i nodi 5 — Sposta solo i punti finali, preferisci il punto più vicino 6 — Aggancia i punti finali solo a punti finali 7 — Aggancia ai nodi di ancoraggio (solo singolo vettore)
Snapped geometry	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output (snapped) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.70.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Snapped geometry	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Output (snapped) vector layer

23.1.15.70.3. Python code

Algorithm ID: qgis:snapgeometries

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.71. Aggancia punti alla griglia

Modifica le coordinate delle geometrie in un vettore, così che tutti i punti o vertici siano agganciati al più vicino punto di una griglia.

Se una geometria agganciata non può essere calcolata (o è totalmente collassata) la geometria dell’elemento sarà eliminata.

Snapping can be performed on the X, Y, Z or M axis. A grid spacing of 0 for any axis will disable snapping for that axis.

Nota

Snapping to grid may generate an invalid geometry in some corner cases.

Permette features in-place modification 1

Vedi anche

Aggancia geometrie al vettore

23.1.15.71.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
X Grid Spacing	HSPACING	[number ] Default: 1.0	Grid spacing on the X axis
Y Grid Spacing	VSPACING	[number ] Default: 1.0	Grid spacing on the Y axis
Z Grid Spacing	ZSPACING	[number ] Default: 0.0	Grid spacing on the Z axis
M Grid Spacing	MSPACING	[number ] Default: 0.0	Grid spacing on the M axis
Snapped	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output (snapped) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.71.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Snapped	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Output (snapped) vector layer

23.1.15.71.3. Python code

Algorithm ID: qgis:snappointstogrid

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.72. Split lines by maximum length

Takes a line (or curve) layer and splits each feature into multiple parts, where each part is of a specified maximum length. Z and M values at the start and end of the new line substrings are linearly interpolated from existing values.

23.1.15.72.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	The input line vector layer
Maximum line length	LENGTH	[number ] Default: 10.0	The maximum length of a line in the output.
Split	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output line vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.72.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Split	LIVELLO IN USCITA	[vector: line]	The new line vector layer - the length of the feature geometries is less than or equal to the length specified in the LENGTH parameter.

23.1.15.72.3. Python code

Algorithm ID: qgis:splitlinesbylength

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.73. Subdivide

Subdivides the geometry. The returned geometry will be a collection containing subdivided parts from the original geometry, where no part has more than the specified maximum number of nodes.

This is useful for dividing a complex geometry into less complex parts, easier to spatially index and faster to perform spatial operations. Curved geometries will be segmentized before subdivision.

Fig. 23.69 Left the input layer, middle maximum nodes value is 100 and right maximum value is 200

Nota

Subdividing a geometry can generate geometry parts that may not be valid and may contain self-intersections.

Permette features in-place modification 1

Vedi anche

Explode lines, Line substring

23.1.15.73.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	The input vector layer
Maximum nodes in parts	MAX_NODES	[number ] Default: 256	Maximum number of vertices each new geometry part is allowed to have. Fewer sub-parts for higher values.
Subdivided	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output (subdivided) vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.73.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Subdivided	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Output vector layer

23.1.15.73.3. Python code

Algorithm ID: qgis:subdivide

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.74. Swap X and Y coordinates

Switches the X and Y coordinate values in input geometries.

It can be used to repair geometries which have accidentally had their latitude and longitude values reversed.

Permette features in-place modification 1

Vedi anche

Translate, Rotate

23.1.15.74.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	The input vector layer
Swapped	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.74.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Swapped	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Output (swapped) vector layer

23.1.15.74.3. Python code

Algorithm ID: qgis:swapxy

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.75. Tapered buffers

Creates tapered buffer along line geometries, using a specified start and end buffer diameter.

Fig. 23.70 Tapered buffer example

Vedi anche

Variable width buffer (by M value), Buffer, Create wedge buffers

23.1.15.75.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Start width	START_WIDTH	[number ] Default: 0.0	Represents the radius of the buffer applied at the start point of the line feature
End width	END_WIDTH	[number ] Default: 0.0	Represents the radius of the buffer applied at the end point of the line feature.
Segments	SEGMENTS	[number ] Default: 16	Controlla il numero di segmenti di linea da usare per approssimare un quarto di cerchio quando si creano offset arrotondati.
Buffered	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output (buffer) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.75.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Buffered	LIVELLO IN USCITA	[vector: polygon]	Output (buffer) polygon layer

23.1.15.75.3. Python code

Algorithm ID: qgis:taperedbuffer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.76. Mosaicatura

Tassella un vettore poligonale, dividendo le geometrie in triangoli.

Il risultato consiste in geometrie multipoligonali per ogni elemento in ingresso, con ogni multi poligono costituito da poligoni triangolari.

Fig. 23.71 Poligono tassellato (destra)

Permette features in-place modification 1

23.1.15.76.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: polygon]	Input polygon vector layer
Tesselated	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.76.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Tesselated	LIVELLO IN USCITA	[vector: polygon]	Output multipolygonZ layer

23.1.15.76.3. Python code

Algorithm ID: qgis:tessellate

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.77. Transetto

Crea transetti sui vertici per (multi)linee.

Un transetto è una linea orientata da un angolo (predefinito: perpendicolare) ad una polilinea in ingresso (ai vertici).

I campi degli elementi sono restituiti nel transetto con questi nuovi campi:

• TR_FID: ID of the original feature

• TR_ID: ID of the transect. Each transect have an unique ID

• TR_SEGMENT: ID of the segment of the linestring

• TR_ANGLE: Angle in degrees from the original line at the vertex

• TR_LENGTH: Lunghezza totale del transetto

• TR_ORIENT: Lato del transetto (solamente a sinistra o a destra della linea, o entrambi i lati)

Fig. 23.72 La linea rossa tratteggiata rappresenta il transetto del vettore lineare in ingresso.

23.1.15.77.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Length of the transect	LENGTH	[number ] Default: 5.0	Length in map unit of the transect
Angle in degrees from the original line at the vertices	ANGLE	[number ] Default: 90.0	Change the angle of the transect
Side to create the transect	SIDE	[numero]	Scegli il lato del transetto. Le opzioni disponibili sono: 0 — Sinistro 1 — Destro 2 — Entrambi
Transect	LIVELLO IN USCITA	[vector: line] Predefinito: [Crea livello temporaneo]	Specify the output line layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.77.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Transect	LIVELLO IN USCITA	[vector: line]	Output line layer

23.1.15.77.3. Python code

Algorithm ID: qgis:transect

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.78. Translate

Moves the geometries within a layer, by offsetting with a predefined X and Y displacement.

Z and M values present in the geometry can also be translated.

Fig. 23.73 Dashed lines represent the translated geometry of the input layer

Permette features in-place modification 1

Vedi anche

Array of translated features, Offset lines, Rotate, Swap X and Y coordinates

23.1.15.78.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Offset distance (x-axis)	DELTA_X	[number ] Default: 0.0	Displacement to apply on the X axis
Offset distance (y-axis)	DELTA_Y	[number ] Default: 0.0	Displacement to apply on the Y axis
Offset distance (z-axis)	DELTA_Z	[number ] Default: 0.0	Displacement to apply on the Z axis
Offset distance (m values)	DELTA_M	[number ] Default: 0.0	Displacement to apply on the M axis
Translated	LIVELLO IN USCITA	[lo stesso del livello in ingresso] Predefinito: [Crea livello temporaneo]	Specify the output vector layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.78.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Translated	LIVELLO IN USCITA	[lo stesso del livello in ingresso]	Output vector layer

23.1.15.78.3. Python code

Algorithm ID: qgis:translategeometry

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.79. Variable distance buffer

Computes a buffer area for all the features in an input layer.

The size of the buffer for a given feature is defined by an attribute, so it allows different features to have different buffer sizes.

Nota

This algorithm is only available from the Graphical modeler.

Vedi anche

Buffer

23.1.15.79.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: qualsiasi]	Livello vettoriale in ingresso
Distance field	DISTANCE	[tablefield: numeric]	Attribute for the distance radius of the buffer
Segments	SEGMENTS	[numero] Predefinito: 5	Controlla il numero di segmenti di linea da usare per approssimare un quarto di cerchio quando si creano offset arrotondati.
Dissolve result	DISSOLVE	[boolean] Predefinito: Falso	Choose to dissolve the final buffer, resulting in a single feature covering all input features. Fig. 23.74 Normal and dissolved buffer
End cap style	END_CAP_STYLE	[numero]	Controls how line endings are handled in the buffer. Fig. 23.75 Stile testata arrotondato, piatto e quadrato
Join style	JOIN_STYLE	[numero]	Specifies whether round, miter or beveled joins should be used when offsetting corners in a line.
Miter limit	MITER_LIMIT	[numero] Default: 2.0	Only applicable for mitered join styles, and controls the maximum distance from the offset curve to use when creating a mitered join.

23.1.15.79.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Buffer	LIVELLO IN USCITA	[vector: polygon]	Buffer di vettore poligonale.

23.1.15.79.3. Python code

Algorithm ID: qgis:variabledistancebuffer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.80. Variable width buffer (by M value)

Creates variable width buffers along lines, using the M value of the line geometries as the diameter of the buffer at each vertex.

Fig. 23.76 Variable buffer example

Vedi anche

Tapered buffers, Buffer, Set M value

23.1.15.80.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vector: line]	Input line vector layer
Segments	SEGMENTS	[number ] Default: 16	Number of the buffer segments per quarter circle. It can be a unique value (same value for all the features), or it can be taken from features data (the value can depend on feature attributes).
Buffered	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output (buffer) layer. One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.80.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Buffered	LIVELLO IN USCITA	[vector: polygon]	Variable buffer polygon layer

23.1.15.80.3. Python code

Algorithm ID: qgis:bufferbym

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.

23.1.15.81. Poligoni di Voronoi

Takes a point layer and generates a polygon layer containing the Voronoi polygons (known also as Thiessen polygons) corresponding to those input points.

Ogni posizione all’interno di un poligono di Voronoi è più vicino al punto associato che a qualsiasi altro punto.

Fig. 23.77 Poligoni di Voronoi

Menu predefinito: Vettore ▶ Strumenti di Geometria

23.1.15.81.1. Parametri

Etichetta	Nome	Tipo	Descrizione
Livello in ingresso	IN INGRESSO	[vettore: punto]	Input point vector layer
Buffer region (% of extent)	BUFFER	[numero] Default: 0.0	The extent of the output layer will be this much bigger than the extent of the input layer
Voronoi polygons	LIVELLO IN USCITA	[vector: polygon] Predefinito: [Crea livello temporaneo]	Specify the output layer (with the Voronoi polygons). One of: Crea Layer Temporaneo (TEMPORARY_OUTPUT) Salva su File… Salva come Geopackage… Salva su Tabella PostGIS… La codifica del file può anche essere cambiata qui.

23.1.15.81.2. In uscita:

Etichetta	Nome	Tipo	Descrizione
Voronoi polygons	LIVELLO IN USCITA	[vector: polygon]	Voronoi polygons of the input point vector layer

23.1.15.81.3. Python code

Algorithm ID: qgis:voronoipolygons

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Usare gli algoritmi di Processing dalla console dei comandi for details on how to run processing algorithms from the Python console.