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5586352a13
Like the vector zonal stats algorithm, but this one works with the zones defined in another raster. Iterates over the input rasters in blocks to be nice and memory efficient. From the algorithm help: "This algorithm calculates statistics for a raster layer's values, categorized by zones defined in another raster layer. If the reference layer parameter is set to "Input layer", then zones are determined by sampling the zone raster layer value at the centroid of each pixel from the source raster layer. If the reference layer parameter is set to "Zones layer", then the input raster layer will be sampled at the centroid of each pixel from the zones raster layer. If either the source raster layer or the zone raster layer value is NODATA for a pixel, that pixel's value will be skipped and not including in the calculated statistics."