[GRASS-user] slope calculation under lat long

Moritz Lennert mlennert at club.worldonline.be
Thu Mar 19 09:06:57 PDT 2020

On 19/03/20 16:37, Giuseppe Amatulli wrote:
> 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)?

AFAIK, r.slope.aspect uses the G_distance() function which calculates 
geodetic distance if in a Lat-Long location, so yes it takes into 
account latitudinal change.

If it doesn't, I would consider this a bug.


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