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Interpolointiliitännäinen

The Interplation plugin can be used to generate a TIN or IDW interpolation of a point vector layer. It is very simple to handle and provides an intuitive graphical user interface for creating interpolated raster layers (see Figure_interpolation_1). The plugin requires the following parameters to be specified before running:

  • Input Vector layers: Specify the input point vector layer(s) from a list of loaded point layers. If several layers are specified, then data from all layers is used for interpolation. Note: It is possible to insert lines or polygons as constraints for the triangulation, by specifying either “points”, “structure lines” or “break lines” in the Type selectstring combo box.
  • Interpolation attribute: Select the attribute column to be used for interpolation or enable the checkbox Use Z-Coordinate checkbox to use the layer’s stored Z values.
  • Interpolation Method: Select the interpolation method. This can be either ‘Triangulated Irregular Network (TIN)’ or ‘Inverse Distance Weighted (IDW)’.
  • Number of columns/rows: Specify the number of rows and columns for the output raster file.

  • Tulostiedosto: Anna tulostiedoston nimi.

  • checkbox :guilabel: Lisää tulos projektiin lisää tulostason kartalle.

Figure Interpolation 1:

../../../_images/interpolate_dialog.png

Interpolointiliitännäinen nix

Liitännäisen käyttö

  1. Käynnistä QGIS ja lataa pistemäinen vektoriaineisto (esim. elevp.csv).

  2. Load the Interpolation plugin in the Plugin Manager (see The Plugins Dialog) and click on the Raster ‣ Interpolation ‣ raster-interpolate Interpolation , which appears in the QGIS menu bar. The Interpolation plugin dialog appears as shown in Figure_interpolation_1.

  3. Valitse lähtöaineisto (esim. elevp selectstring) ja sarake (esim. ELEV)

  4. Select an interpolation method (e.g., ‘Triangulated Irregular Network (TIN)’), and specify a cell size of 5000 as well as the raster output filename (e.g., elevation_tin).

  5. Paina [OK].