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

[GRASS GIS]

#3860: GRASS GIS producing different slope than GDAL
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  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
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Comment (by 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 programs.
 >
 > 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
 using?

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3860#comment:6>
GRASS GIS <https://grass.osgeo.org>