3.4.6.4. Cross classification

_images/cross_classification_tab.png

Cross classification

This tab allows for the calculation of a cross classification raster and matrix. Classification is compared to a reference raster or reference vector (which is automatically converted to raster). This is useful for calculating the area for every combination between reference classes and classification values. If a vector is selected as reference, it is possible to choose a field describing class values.

The output is a cross raster that is a .tif file where pixel values represent the categories of comparison (i.e. combinations identified by the CrossMatrixCode) between the classification and reference. Also, a text file containing the cross matrix (i.e. a .csv file) is created with the same name defined for the .tif file.

This tool supports virtual raster output; if the output file name ends with .vrt then the output is created as virtual raster composed of as many .tif files as the number of CPU threads defined in System; for large rasters this can speed up the process.

Порада

Information about APIs of this tool in Remotior Sensus at this link .

3.4.6.4.1. Cross classification

Tool symbol and name

Description

Select the classification input_list

select a classification raster (already loaded in QGIS)

reload

refresh layer list

checkbox Use value as NoData input_number optional

if checked, set the value of NoData pixels, ignored during the calculation

Select the reference vector or raster input_list

select a raster or a vector (already loaded in QGIS), used as reference layer

reload

refresh layer list

Vector field input_list optional

if a vector is selected as reference, select a vector field containing numeric class values

checkbox Calculate linear regression optional

if checked, calculate linear regression between the two input layers

Script script_tool

add this function to the Script

RUN run

run this function