3.4.5.10. Land cover change

_images/land_cover_change_tab.jpg

land_cover_change Land cover change

The tab Land cover change allows for the comparison between two classifications in order to assess land cover changes.

Output is a land cover change raster (i.e. a file .tif showing the changes in the map, where each pixel represents a category of comparison (i.e. combinations) between the two classifications, which is the ChangeCode in the land cover change statistics) and a text file containing the land cover change statistics (i.e. a file .csv separated by tab, 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.

3.4.5.10.1. Input

  • Select the reference classification input_list: select a reference classification raster (already loaded in QGIS);
  • reload: refresh layer list;
  • Select the new classification input_list: select a new classification raster (already loaded in QGIS), to be compared with the reference classification;
  • reload: refresh layer list;
  • checkbox Report unchanged pixels: if checked, report also unchanged pixels (having the same value in both classifications);
  • BATCH batch_tool: add this function to the Batch;
  • RUN run: choose the output destination and start the calculation; the land cover change statistics are displayed in the tab Output (and saved in a text file) and the land cover change raster is loaded in QGIS;