[GRASS-web] Algorithm

preiaen nils.hempel at gmx.de
Tue Aug 8 08:01:11 PDT 2017

Hey all, 

I am currently looking into the slope calculation myself and stumbled over
something which might be a documentation error. 

The documentation page  
https://grass.osgeo.org/grass72/manuals/r.slope.aspect.html shows a picture
of a test plane and another with the resulting slope values in degree. 

I wasn't able to recalculate those slope values either manually or with the
shown test plane (attached to this message).  

Since the descriptions in the paper from Berthold Horn
(http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1456186) as well as in
the Grass book correspond to the implementation, I assume that the
documentation is wrong or outdated.  
If one wants to check my results, I've attached my testplane settings to
this message  test_plane_lg.txt
<http://osgeo-org.1560.x6.nabble.com/file/n5330817/test_plane_lg.txt>  .

Best regards,
Nils Hempel  

View this message in context: http://osgeo-org.1560.x6.nabble.com/Algorithm-tp5308760p5330817.html
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