[GRASS-web] Algorithm

Markus Neteler neteler at osgeo.org
Wed Feb 22 11:58:28 PST 2017

On Mon, Feb 20, 2017 at 10:00 AM, Miriam Mziray Dalseg
<miriam.mziray.dalseg at krigsskolen.no> 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 mentioned by Helmut, the code is linked on the respective manual pages.

In addition we have documented the mathematics behind r.slope.aspect
in the GRASS GIS book, Appendix A, pages 375-376:

Markus Neteler and Helena Mitasova, 2008,
Open Source GIS: A GRASS GIS Approach. Third Edition
The International Series in Engineering and Computer Science: Volume 773
406 pages, 80 illus., Springer, New York
ISBN: 038735767X | ISBN-13: 978-0-387-35767-6

Maybe your library can get it for you.

Best regards,
Markus Neteler

Markus Neteler, PhD
http://www.mundialis.de - free data with free software

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