Hi HB, Here is one more:
r.shaded.pca - Creates relief shades from various directions and combines them into RGB composition. https://grass.osgeo.org/grass8/manuals/addons/r.shaded.pca.html Best Markus On Fri, Feb 16, 2024 at 11:20 PM B H via grass-user <grass-user@lists.osgeo.org> wrote: > > Hi, > I am trying to create a hillshading effect using DEM rasters similar to ESRI > multidirectional hillshading, but I am unable to get anything in. grass to > perform as good as ESRI (or even gdaldem multidirectional shading). > I am hoping someone in this group has some scripts /addon/tips that I can try. > > So far I have tried the following on a few DEMs ( from 3m to 100 m grid > sizes). > 1) gdaldem multidirectional hillshading : It's not grass based, but so far > has performed better than other grass options : with the parameter zfactor > between 1 and 10. But it does not seem to be quite as good as ESRI. > 2) Following code is based on some old discussion on this email list.(Its > seems to exaggerate the hills and valleys more than I would expect) > https://gist.github.com/amcox/b54d65f08fe4448840462901fd6350d4 > 3) Other variants of hillshading like r.skyview : Tried with several > parameters but it seems to be inferior to gdaldem (It seems to be a 'washed > out' version of the multidirectional. hillshading). > > Thanks, > HB > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/grass-user -- Markus Neteler, PhD https://www.mundialis.de - company https://grass.osgeo.org - FOSS https://neteler.org - freelancing & blog _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
