#2935: r.watershed returns bogus flow direction without warning when using large
"virtual" terrain
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Reporter: mankoff | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone: 7.0.4
Component: Raster | Version: 7.0.3
Resolution: | Keywords:
CPU: Unspecified | Platform: MacOSX
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Changes (by mankoff):
* cc: mankoff (added)
* version: 6.4.4 => 7.0.3
Comment:
I've upgrade to {{{grass 7.0.3}}} and this bug still exists. Here is an
MWE to recreate it:
{{{
grass70 -text ./nc_spm_08_grass7/PERMANENT
r.rescale input=elev_srtm_30m output=HUGE_elev to=-30000,30000000
r.rescale input=elev_srtm_30m output=OK_elev to=-30,30000
r.watershed elevation=HUGE_elev accumulation=HUGE.acc drainage=HUGE.fdir
r.watershed elevation=OK_elev accumulation=OK.acc drainage=OK.fdir
g.gui.mapswipe first=HUGE.acc second=OK.acc
g.gui.mapswipe first=HUGE.fdir second=OK.fdir
}}}
Now that grass supports other planets
https://grasswiki.osgeo.org/wiki/Planetary_mapping it is likely others
will run into similar issues when flow routing over terrain with values
significantly larger than Earth topography.
--
Ticket URL: <https://trac.osgeo.org/grass/ticket/2935#comment:2>
GRASS GIS <https://grass.osgeo.org>
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