[GRASS-dev] [GRASS GIS] #1219: Integrate the IGNF register and the shift grid RGF93-NTF in grass

#1219: Integrate the IGNF register and the shift grid RGF93-NTF in grass
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  Reporter: lemaitret | Owner: grass-dev@…
      Type: | Status: new
  enhancement |
  Priority: normal | Milestone: 7.2.0
Component: | Version: svn-releasebranch70
  Projections/Datums | Keywords: nad, g.proj, IGNF register shift
Resolution: | grid NTF RGF93
       CPU: All | Platform: All
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Comment (by neteler):

Here how to test which files are used (expected: via GDAL/PROJ):

{{{
PROJ_DEBUG=ON CPL_DEBUG=ON m.proj proj_in="+init=epsg:4326"
proj_out="+proj=longlat +datum=NAD27" coordinates=-100,40 -d
}}}

The debug messages contain the datum shift file usage information.

TODO: find test case for ntf_r93. Could be done by using the values from
  https://github.com/OSGeo/proj.4/blob/master/nad/testIGNF
within m.proj.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/1219#comment:10&gt;
GRASS GIS <https://grass.osgeo.org>