Zonal statistics
GRASS GIS offers support for zonal statistics
Single maps
- r.clump: finds all areas of contiguous raster cell category values in the input raster map and assigns a unique category value to each such area ("clump") in the resulting output raster map. This can be used to calculate statistics based on the clumps instead of individual raster cells.
- r.report: report generator in various units
- r.neighbors: makes each cell category value a function of the category values assigned to the cells around it, and stores new cell values in an output raster map layer.
- v.neighbors: makes each cell value a function of the attribute values assigned to the vector points or centroids around it, and stores new cell values in an output raster map layer.
Multiple maps
- r.univar: univariate and zonal raster statistics
- v.rast.stats: calculates univariate statistics from a raster map based on vector polygons and uploads statistics to new attribute columns
- v.vect.stats: count points in areas, calculate statistics from point attributes (needs GRASS 7).