[GRASS-dev] [GRASS GIS] #3860: GRASS GIS producing different slope than GDAL

GRASS GIS trac at osgeo.org
Mon Jun 10 01:50:29 PDT 2019

#3860: GRASS GIS producing different slope than GDAL
  Reporter:  mazingaro  |      Owner:  grass-dev@…
      Type:  defect     |     Status:  new
  Priority:  major      |  Milestone:  7.6.2
 Component:  Raster     |    Version:  unspecified
Resolution:             |   Keywords:  slope
       CPU:  x86-64     |   Platform:  Linux

Comment (by mlennert):

 Replying to [comment:6 mazingaro]:
 > Replying to [comment:5 mlennert]:
 > > The first difference is between gdaldem and r.slope.aspect results at
 the resolution of the input data.
 > >
 > > The second difference is between two runs of r.slope.aspect, one at
 the resolution of the input data (10m), one at half that resolution (5m).
 It is meant to show that differences because of different region settings
 are probably much more significant than differences between the two
 > >
 > > I personally would not consider an average difference of almost 4
 degrees "normal" if I expected same results...
 > Yes, you are right.
 > Anyway, that means that your slopes are not so different (GRASS-GDAL)
 while i got them way more different (+10 degrees). Which GRASS are you

 Current stable, i.e. 7.6.

 Could you make your data available for testing ?

Ticket URL: <https://trac.osgeo.org/grass/ticket/3860#comment:7>
GRASS GIS <https://grass.osgeo.org>

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