.. only:: html

   |updatedisclaimer|

.. index:: Raster Statistics
   single: Plugins; Zonal statistics
.. _zonal_statistics:

Zonal Statistics Plugin
=======================

With the |rasterStats| :guilabel:`Zonal statistics` plugin, you can analyze
the results of a thematic classification. It allows you to calculate several values
of the pixels of a raster layer with the help of a polygonal vector layer (see
figure_zonal_statistics_). Choosing a color band, the plugin generates output
columns in the vector layer with an user-defined prefix and calculates for each
polygon, statistics on pixels that are within.
The available statistics are :

- **Count**: to count the number of pixels
- **Sum**: to sum the pixel values
- **Mean**: to get the mean of pixel values
- **Median**: to get the median of pixel values
- **StDev**: to get the standard deviation of pixel values
- **Min**: to get the minimum of pixel values
- **Max**: to get the maximum of pixel values
- **Range**: to get the range (max - min) of pixel values
- **Minority**: to get the less represented pixel value
- **Majority**: to get the most represented pixel value
- **Variety**: to count the number of distinct pixel values

.. _figure_zonal_statistics:

.. figure:: /static/user_manual/plugins/zonal_statistics.png
   :align: center

   Zonal statistics dialog