[GRASS-user] slope calculation under lat long

Giuseppe Amatulli giuseppe.amatulli at gmail.com
Thu Mar 19 08:37:28 PDT 2020

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 Amatulli, Ph.D.

Research scientist at
School of Forestry & Environmental Studies
Center for Research Computing
Yale University
New Haven, CT, USA
Teaching: http://spatial-ecology.net
Work:  https://environment.yale.edu/profile/giuseppe-amatulli/
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