Integrate the IGNF register and the shift grid RGF93-NTF in grass

[landam]

Reported by lemaitret on 18 Nov 2010 21:54 UTC The IGNF registry and the shift grid are well integrated in proj, but not in grass.

More information on the way I found to well use these on the wiki : http://grass.osgeo.org/wiki/IGNF_Register

GRASS GIS version and provenance

svn-releasebranch70

Migrated-From: https://trac.osgeo.org/grass/ticket/1219

[landam]

Comment by lemaitret on 18 Nov 2010 22:00 UTC Excuse me, a better link is : http://grass.osgeo.org/wiki/IGNF_register_and_shift_grid_NTF/RGF93

Concerning the milestone, I think it affects every version.

[landam]

Comment by lemaitret on 8 Jan 2011 10:15 UTC People need maybe more description. I try to give them here.

First of all, I update the link I gave before : http://grass.osgeo.org/wiki/IGNF_register_and_shift_grid_NTF-RGF93 in English] and [http://grass.osgeo.org/wiki/IGNF_register_and_shift_grid_NTF-RGF93/fr in French

The IGNF registry is a document such as the EPSG specifications : it describes many projection parameters and give them an ID. The EPSG ID can be used in GRASS to create a location, but not the IGNF ID. On a Linux system the IGNF and the EPSG are in the folder: /usr/share/proj/ and they seem to be both well used by proj. GRASS manage to use the EPSG file, but not the IGNF.

'''It should be good to have the possibility to select and use the IGNF registry to define a location. It's currently not possible to well parse the IGNF registry with the location wizard.'''

A subproblem : the IGNF registry mentions the shift grid ntf_r93.gsb. To be used, this grid should be in the etc/nad/ folder of GRASS (on Linux and grass 6.4 : /usr/lib/grass64/etc/nad/).

'''It should be good to have a copy of the ntf_r93.gsb shift grid in the etc/nad/ folder of grass to use it.'''

Other links : IGNF registry : http://lambert93.ign.fr/fileadmin/files/IGNF ntf_r93.gsb shift grid : http://lambert93.ign.fr/fileadmin/files/ntf_r93.gsb

[landam]

Comment by neteler on 21 Aug 2012 19:10 UTC Indeed, GRASS 6.4 offers only:

alaska conus FL hawaii MD ntv1_can.dat nzgd2kgrid0005.gsb prvi stgeorge stlrnc stpaul TN WI WO

while proj-nad-4.7.0 offers:

alaska conus epsg esri esri.extra FL GL27 hawaii IGNF MD nad27 nad83 nad.lst ntf_r93.gsb ntv1_can.dat null nzgd2kgrid0005.gsb other.extra pj_out27.dist pj_out83.dist proj_def.dat prvi stgeorge stlrnc stpaul td_out.dist test27 test83 testvarious* TN WI WO world

Time to populate lib/proj/ with more nad files?

[landam]

Comment by neteler on 12 Jan 2014 23:07 UTC I don't know how to solved this issue. Just add more files to GRASS?

[landam]

Comment by vincent on 13 Jan 2014 07:49 UTC Replying to [comment:4 neteler]:

I don't know how to solved this issue. Just add more files to GRASS?

We evoked this issue here for the last time : http://lists.osgeo.org/pipermail/grass-user/2013-August/068804.html You mentioned a possible new mechanism for grass to use these files (registers and grids) directly from proj directories (/usr/share/proj) instead of copies.

In the case of french projections, proj4 integrated IGNF and ntf_r93.gsb since version 4.6 or so.

[landam]

Modified by neteler on 12 May 2016 08:26 UTC

[landam]

Comment by neteler on 15 May 2016 21:47 UTC lib/proj/ got an overhaul, see https://trac.osgeo.org/grass/ticket/2456.

Yet lacking is the use of PROJ's datum shift grid files directly rather than GRASS' local copy.

[landam]

Comment by neteler on 9 Jun 2016 09:05 UTC added ntf_r93.gsb and null.lla unless trac https://trac.osgeo.org/grass/ticket/2456 is solved in https://trac.osgeo.org/grass/changeset/68654

[landam]

Comment by neteler on 9 Jun 2016 10:00 UTC Replying to [comment:8 neteler]:

added ntf_r93.gsb and null.lla unless trac https://trac.osgeo.org/grass/ticket/2456 is solved in https://trac.osgeo.org/grass/changeset/68654

and Makefile updated in https://trac.osgeo.org/grass/changeset/68655

[landam]

Comment by neteler on 22 Aug 2016 14:32 UTC 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.

[landam]

Comment by neteler on 28 Dec 2016 15:04 UTC Ticket retargeted after milestone closed

[landam]

Modified by @landam on 5 May 2017 20:40 UTC

[landam]

Comment by @landam on 1 Sep 2017 20:28 UTC All enhancement tickets should be assigned to 7.4 milestone.

[landam]

Comment by neteler on 26 Jan 2018 11:40 UTC Ticket retargeted after milestone closed

[landam]

Modified by neteler on 12 Jun 2018 20:48 UTC

[landam]

Comment by @landam on 25 Sep 2018 16:51 UTC All enhancement tickets should be assigned to 7.6 milestone.

[landam]

Comment by @landam on 25 Jan 2019 21:07 UTC Ticket retargeted after milestone closed