On Tue, Sep 13, 2016 at 4:02 PM, Anna Petrášová <[email protected]> wrote: > On Tue, Sep 13, 2016 at 7:58 AM, Helmut Kudrnovsky <[email protected]> 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/
You find the formulas used for the r.slope.aspect and r.resamp.rst implementations in the GRASS book, 3rd edition, 2008, Springer, Appendix pages 371-376. Best, Markus _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
