[GRASS-user] Interpreting r.watershed accumulation map

Rich Shepard rshepard at appl-ecosys.com
Mon Oct 17 14:29:34 PDT 2016


On Sun, 16 Oct 2016, Sören Gebbert wrote:

> I don't know why this happens.

   I sent Laurant the DEM and the Itzi simulation run worked for him using
grass-7.0.5, but it fails here with grass-7.0.6, 7.2.svn, and 7.3.svn. There
must be something different here on this particular host; I've no idea where
to start looking for differences.

   Also, there are differences in the elevation maps produced by different
grass versions when the same source DEM is re-projected. The same command
was used in each version:

r.proj --o loc=Oregon-Dayton-feet map=topography in=be_cropped out=be_cropped
meth=bilinear

   The output from 7.0.x is smaller, and shows greater elevation differencs,
that those of 7.2.svn and 7.3.svn (the latter two appear the same); copies
attached.

   If anyone has suggestions on identifying what's different on this host
that prevents Itzi from running, please share your expertise with me.

Rich

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