[GRASS-user] GRASS raster curvature analysis type

[Anna Petrášová]

On Tue, Sep 13, 2016 at 7:58 AM, Helmut Kudrnovsky <hellik at web.de> wrote:
> 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

also r.param.scale:
https://trac.osgeo.org/grass/browser/grass/trunk/raster/r.param.scale/

>
>
>
> -----
> best regards
> Helmut
> --
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