r.volume
r.volume - Calculates the volume of data "clumps".
Raster (r.*)
ParameterRaster|data|Existing raster map representing data that will be summed within clumps|False
ParameterRaster|clump|Existing raster map, preferably the output of r.clump|False
ParameterBoolean|-f|Generate unformatted report|False
OutputVector|centroids|Vector points map to contain clump centroids