[GRASS-user] GRASS raster curvature analysis type

[Helmut Kudrnovsky]

georges wrote
> Hello,
> 
> I would like to know whether raster curvature analysis in GRASS
> is Gaussianor Mean curvature analysis?
> https://en.wikipedia.org/wiki/Gaussian_curvature
> https://en.wikipedia.org/wiki/Mean_curvature
> 
> This GRASS 7.2 manuals page mentions that raster curvature analysis can be
> conducted in direction of steepest slope and in the direction of the
> contour tangent, therefor distinguishing two curvature options: profile
> and tangential.
> 
> Still are these two Gaussian or Mean curvatures?
> 
> Thank you for the reply.

I can't tell you directly which algorithm is used.

fortunately GRASS GIS is open source; so maybe have a look at the source
code to check:

r.slope.aspect:

https://trac.osgeo.org/grass/browser/grass/trunk/raster/r.slope.aspect/main.c

or

r.resamp.rst

https://trac.osgeo.org/grass/browser/grass/trunk/raster/r.resamp.rst/main.c

HTH



-----
best regards
Helmut
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