mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-06 00:05:02 -05:00
52 lines
1.1 KiB
ReStructuredText
52 lines
1.1 KiB
ReStructuredText
ZONAL STATISTICS
|
|
================
|
|
|
|
Description
|
|
-----------
|
|
|
|
This algorithm calculates some statistics values for pixels of input raster
|
|
inside certain zones, defined as polygon layer.
|
|
|
|
Following values calculated for each zone:
|
|
|
|
* minimum
|
|
* maximum
|
|
* sum
|
|
* count
|
|
* mean
|
|
* standard deviation
|
|
* number of unique values
|
|
* range
|
|
* variance
|
|
|
|
All results stored in output vector layer in columns with user-defined prefix.
|
|
|
|
|
|
Parameters
|
|
----------
|
|
|
|
- ``Raster layer``: The raster layer to use.
|
|
- ``Raster band``: The band number.
|
|
- ``Vector layer containing zones``: The vector layer with zones.
|
|
- ``Output column prefix``: User-defined prefix for output columns.
|
|
- ``Load whole raster in memory``: Determines if raster band will be loaded in
|
|
memory or readed by chunks. Useful only when disk IO or raster scanning
|
|
inefficiencies are your limiting factor.
|
|
|
|
Outputs
|
|
-------
|
|
|
|
- ``Output layer``: The resulting layer with new columns added.
|
|
|
|
See also
|
|
--------
|
|
|
|
|
|
Console usage
|
|
-------------
|
|
|
|
|
|
::
|
|
|
|
processing.runalg("qgis:zonalstatistics", input_raster, band_number, input_vector, column_prefix, load_flag, output_layer)
|