[Qgis-user] Volume between two surfaces

[Carlos Cerdán]

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
>
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