Hi, On Tue, Jul 10, 2018 at 6:04 AM, <marion-brunet at sfr.fr> wrote: ... > I had two DEMS and I used r.mapcalc to get > the difference between them. I want to calculate the total volume of this > last raster. I wonder if https://grass.osgeo.org/grass74/manuals/r.volume.html could be of any use here? Markus