[GRASS-user] calculate the volume of a DEM with r.volume

[Markus Neteler]

Hello Marion,

On Wed, Jul 11, 2018 at 10:32 AM,  <marion-brunet at sfr.fr> wrote:
> Hello,
>
> I tried using r.volume as you suggested.  According to the documentation
it
> is suitable for what I am trying to do.
>
> However, when I use it, I don't have the "Total volume" line at the end of
> the report, like it is shown in the documentation. I just have the total
> volume of each clump, but not of all the clumps... Has it ever happened to
> you when using this command?

That's weird! Which version/operating system do you use?

> in the command line
>
> I simply wroter.volume input=difference clump=clump in the command line


Here on command line:

GRASS 7.4.1svn (nc_spm_08_grass7):~ > g.region raster=elevation
GRASS 7.4.1svn (nc_spm_08_grass7):~ > r.volume input=elevation
clump=geology_30m
 100%

Volume report on data from <elevation> using clumps on <geology_30m> raster
map

Category   Average   Data   # Cells        Centroid             Total
Number     in clump  Total  in clump   Easting     Northing     Volume
-----------------------------------------------------------------------------
     217    118.93  86288828  725562   635325.00   221535.00
 8628882798.63
     262    108.97  21650560  198684   638935.00   222495.00
 2165056037.02
     270     92.23  63578874  689373   642405.00   221485.00
 6357887443.53
     405    132.96  33732662  253710   631835.00   224095.00
 3373266208.59
     583    139.35   3011288   21609   630205.00   224665.00
301128821.55
     720    124.30    599618    4824   634075.00   227995.00
 59961816.06
     766    132.43    936791    7074   631425.00   227845.00
 93679120.08
     862    118.31   7302317   61722   630505.00   218885.00
730231746.74
     910     94.20   4235816   44964   639215.00   216365.00
423581613.11
     921    135.22   1693985   12528   630755.00   215445.00
169398523.05
     945    127.24      1145       9   630015.00   215015.00
 114512.03
     946     89.91    365748    4068   639085.00   215255.00
 36574833.85
     948    129.02    112632     873   630185.00   215115.00
 11263181.57
-----------------------------------------------------------------------------
                                                Total Volume =
22351026655.81

... which looks ok.

Can you say a bit more about your system?

Markus
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