Hi, I wondering if the slope calculation in GRASS (https://grass.osgeo.org/grass78/manuals/r.slope.aspect.html) take in to account the latitudinal change of the meridian distance or just simply treats the raster as square grids also under lat long system (WGS84)?
In case of "treats the WGS84 raster as square grids" the only solution to obtain better results is to resampling the DEM to UTM or to Equi7. Thank you Giuseppe -- Giuseppe Amatulli, Ph.D. Research scientist at School of Forestry & Environmental Studies Center for Research Computing Yale University New Haven, CT, USA 06511 Teaching: http://spatial-ecology.net Work: https://environment.yale.edu/profile/giuseppe-amatulli/
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