[GRASS-user] Re-projected Data Position Mismatch

[Markus Neteler]

On Wed, Aug 30, 2017 at 10:46 PM, Markus Metz
<markus.metz.giswork at gmail.com> wrote:
...
> Considering this particular CRS (EPSG:3857), it is strange than gdalwarp
> works while GRASS reprojection does not work because GRASS uses GDAL to
> convert WKT to proj4, then to GRASS terminology. Some debugging is needed to
> figure out why within GRASS, the conversion from WKT to proj4 (using GDAL)
> produces wrong results.

For whom is interested to do so, here explanations on how to debug all
this (we crafted this part of the README at the FOSS4G 2016 in Bonn
during the code sprint):
https://trac.osgeo.org/grass/browser/grass/trunk/lib/proj/README.txt

markusN