French reprojection use ntf_r93.gsb (IGNF:LAMBE etc ..)

[qgib]

Author Name: Yves ryra6453 (Yves ryra6453)
Original Redmine Issue: 14101
Affected QGIS version: 2.12.2

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ERROR when reproject or save as whith "IGNF:xxx" projection

for example:

PROJ.4:  +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0 +to  +proj=lcc +nadgrids=ntf_r93.gsb,null +a=6378249.2000 +rf=293.4660210000000 +pm=2.337229167 +lat_0=46.800000000 +lon_0=0.000000000 +k_0=0.99987742 +lat_1=46.800000000 +x_0=600000.000 +y_0=2200000.000 +units=m +no_defs
			Erreur: failed to load datum shift file

in python console

>>>import os
>>>os.getenv('PROJ_LIB')
'"C:\\MYPROG~1\\QGIS_L~1.2\\share\\proj"'

path is ok and ntf_r93.gsb exist.

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Related issue(s): #22200 (duplicates)
Redmine related issue(s): 14198

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[qgib]

Author Name: Yves ryra6453 (Yves ryra6453)

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I found a temporary solution.

I change the proj4 definition in the database /path_qgis/apps/qgis/ressources/srs.db
In table tbl_srs

I delete ",null" after "+nadgrids=ntf_r93.gsb" in parameters column

reprojection now operating normally

I test whith national reference software (IGN Circé France) the coordinate convertion is exact.

[qgib]

Author Name: Quan Tum (Quan Tum)

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Hello all,
I have the same bug here and found the same workaround.

For future references, the OP has more detailed information (in french) here : http://georezo.net/forum/viewtopic.php?pid=277328#p277328
Results are the same with 32 an d 64 bit standalone setup, as well as OSGEO4W setup. So it seems to come from QGIS itself.

On my side, with an OSGEO4W setup, other software using gdal seem to work without problem.

The symptoms are the same than in this bug #16809
Although the bug/solution for this one was in OSGEO4W code, there are some interesting debugging information.
I didn't manage to find a solution though and would be glad if more experienced devs could give a hand !

Thanks,
Cev.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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This is a (fixed) OSGeo4W issue with the proj package.

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• resolution was changed from to up/downstream
• status_id was changed from Open to Closed