[MetaCRS] IGNF Projection catalog?

[Richard didier]

Le Mercredi 17 Décembre 2008 13:45, Christopher Schmidt a écrit :
> Hi,
>
> I see that proj4js has a catalog for the IGNF projections:
>
>   http://trac.osgeo.org/proj4js/browser/trunk/tools/catalogues/IGNF
>
> I've googled, and found a couple places where these codes appear to
> possibly come from:
>
>   http://www.geoportail.fr/partage/Professionnel/RIG/RIG.xml
>  
> http://svn.osgeo.org/gdal/trunk/gdal/ogr/ogrsf_frmts/geoconcept/geoconcept_
>syscoord.c
>
> and the code mentions that:
>
>  " The following information came from GEO CONCEPT PROJECTION files"
>
> There is also:
>   http://lambert93.ign.fr/index.php?id=28
>
> Which is in French, but mentions "+init=IGNF:LAMBE +to
> +init=IGNF:LAMB93", which makes me think it might be related.
>
> Can anyone point to the canonical source for this data? is it the
> RIG.xml, and is there a process used to convert these to WKT? (Or is
> proj4 the canonical string format?)
>

Hi Christopher,

The IGNF catalogue for PROJ4 has been integrated by me in the 1.6.1 release 
(the last one).
It is produced from our internal DB that allows others catalogues like 
ignf-spatial_ref_syst.sql, qgis.sql, RIG.xml for different software.
Basically, the idea was that on PROJ.4 based software using our catalogue 
could directly benefits from our interpolation grid for NTF to RGF93.
I have also sent to PROJ4JS project python script to convert EPSG and IGNF 
files format of PROJ.4 into JavaScript for PROJ4JS.

In the coming month, the canonical source will be RIG.xml that will be hosted 
under http://librairies.ign.fr/geoportail/resources/RIG.xml (there is already 
a file there, it is not the final one). All other links you mentionned will 
be redirected to it.


The lambert93.ign.fr web site is an information web site for the French users 
as there is a regulation in France to change the legal projection to LAMB93 
(end date in march 2009). It gives also information to experts about what we 
have done in OpenSource projects (follow Outils pour experts -> 
Téléchargement).

> Regards,

All the best,

didier
-- 
Didier RICHARD, chef du pôle technique Géoportail pour l'IGN
Institut Geographique National           tel: +33/0 1.43.98.83.23
2/4 Avenue Pasteur                       fax: +33/0 1.43.98.80.88
F-94165 St-Mande Cedex                e-mail: Didier.Richard at ign.fr