[gdal-dev] How robust is OGRSpatialReference::GetAuthorityCode?

[Even Rouault]

Le vendredi 07 juin 2013 06:50:26, David Strip a écrit :
> How well does OGRSpatialReference::GetAuthorityCode perform in the wild
> when handed a WKT? In particular, if I have satellite imagery from
> someplace in the world that was ortho-rectified in a "sane" manner to a
> national or state projection with an conforming WKT, will this function
> return an EPSG value?  (I realize "robust" is somewhat ill-defined, but
> this is the best I could come up with in terms of my question. Sorry).

David,

OGRSpatialReference::GetAuthorityCode() should be pretty robust, in the sense 
that it will return the authority code if an AUTHORITY[] node exists in the 
WKT. Otherwise it will return NULL.

The key is to have a WKT with AUTHORITY in it, which is for example NOT the 
case with the .prj files accompagning shapefiles.

You can also have a look at OGRSpatialReference::AutoIdentifyEPSG(), but don't 
expect too much of it... See its doc.

Even


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