[GRASS-web] Algorithm

Helmut Kudrnovsky hellik at web.de
Tue Feb 21 12:08:59 PST 2017

Miriam Mziray Dalseg wrote
> Hei! I was wondering if there is any documentation on how GRASS/GDAL
> calculates slope in QGIS? I'm looking for algorithms, but I can't find it.
> Looking for something similar to what ArcMap has:
> http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/how-slope-works.htm.
> I'm looking for more documentation than what I can find on
> https://grass.osgeo.org/grass70/manuals/r.slope.aspect.html and
> documentation on algorithms.

as GRASS GIS is open source software, the source code of r.slope.aspect is
accessible at:


best regards
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