[gdal-dev] Unsupported SRS but available in epsg file

[Guillaume Sueur]

Le mardi 17 novembre 2009 à 14:48 +0100, Even Rouault a écrit :
> Selon Guillaume Sueur <no-reply at neogeo-online.net>:
> 
> Guillaume,
> 
> I agree that understanding what is the OGR responsibility and what is proj.4
> responsability is not always obvious ;-)
> 
> When you use "EPSG:xxxx" or "+init=EPSG:xxxxx" as a SRS definition, OGR will try
> to resolve the EPSG code from its own CSV data files, and thus will not use
> /usr/share/epsg/proj for this. This is normally done with the
> $(gdal_data)/gcs.csv or $(gdal_data)/pcs.csv files derived from the EPSG
> database. But the simplest way is to add the following line
> to $(gdal_data)/cubewerx_extra.wkt

I had the feeling that there was something funny here !
> 
> 900913,PROJCS["Google Maps Global Mercator",GEOGCS["WGS
> 84",DATUM["WGS_1984",SPHEROID["WGS
> 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Mercator_2SP"],PARAMETER["standard_parallel_1",0],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",0],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1],EXTENSION["PROJ4","+proj=merc
> +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m
> +nadgrids=@null +wktext  +no_defs"]]
> 
> Well, at least, that's the way it works for trunk. No guarantee this works with
> GDAL 1.5.X (I think it should be OK though)

I'm gonna try it right away. Thanks a lot Even !

> 
> Hum, actually while reviewing SVN history, this should be done in 1.5.3
> according to http://trac.osgeo.org/gdal/browser/tags/1.5.3/gdal/data. So check
> if the GDAL_DATA environnement variable is well defined.
> 
> If it still not works, one workaround is to quote the full PROJ4 string
> "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0
> +units=m +nadgrids=@null +no_defs" on the ogr2ogr command line.
> 
> Even
> 
> > I know it's the official one,  but since it has been introduced in proj
> > 4.7 (the server is running 4.5) and OpenLayers still defines it as
> > 900913, no chance to get it work with 3857 !
> >
> >
> >
> > Le mardi 17 novembre 2009 à 11:33 +0100, Jean-Claude REPETTO a écrit :
> > > Guillaume Sueur a écrit :
> > > > I have added to that file the famous 900913 definition
> > > >
> > > > When I try to create a SpatialReference with 900913 code, I run into a
> > > > SRSException: Unsupported SRS
> > > >
> > > > Any hint would be appreciated !
> > > >
> > >
> > > Hi Guillaume,
> > >
> > > Have you tried EPSG:3857, which is the official EPSG number for this
> > > projection ?
> > >
> > > Jean-Claude
> > >
> > >
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> 
> 
>