Hi Carlos, Thank you for your great tip!
I was thinking... creating masks to separate the negative valuesfrom the positive valuesof the raster 'Hight', I can get the excavation and landfill volumes, right? Thanks! Pedro ----- Original Message ----- From: Carlos Cerdán <[email protected]> To: [email protected] Cc: Sent: Tuesday, March 5, 2013 11:16 PM Subject: Re: [Qgis-user] Volume between two surfaces One idea: Use calculator on GRASS and do: Surface 1 - Surface 2 = Hight We have the heigth value on each cell, so now use r.sum: Volume = r.sum (of Hight) * side of pixel ^2 (if cells are squares) Of course, you must use a mask to boundary your area of interest Carlos Cerdán El 05/03/13 17:49, Pedro Venâncio escribió: > Hi all, > > Is there any way to calculate the volume between two surfaces (two DEM > rasters)? > > There are ways to calculate the volume between a surface and a particular > height value (GRASS r.volume or SAGA Grid Volume) but I can not find how to > calculate the volumes (landfill / excavation) between two DEM. > > Any tips? > > Thank you very much! > > Best regards, > Pedro Venâncio > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
