[Gdal-dev] GetProjectionRef() returns an empty string.

Gillian Walter gillian.walter at atlantis-scientific.com
Wed Mar 16 09:06:33 EST 2005


If an image is geocoded with ground control points rather than an affine 
transform (geotransform), you use GetGCPProjection() rather than 
GetProjectionRef() to get the projection string.  The ottawa patch 
probably uses gcps.


Michele Sanges wrote:

> Hi all,
> I'm testing my program by means the example map files available at 
> ftp://ftp.remotesensing.org/gdal/data/.
> I'm comparing the result string returned by the 
> GDALDataset::GetProjectionRef() method, with the same information 
> printed out by the OpenEV program, for any of these files.
> I notice that for some file, for example "/aaigrid/095b_dem_90m.asc", 
> the string printed out is the same; for other files, for example 
> "/ceos/ottawa_patch.img", the OpenEV program prints the projetion 
> string while my call to GetProjectionRef() method return an empty 
> string (not NULL). Does someone can give me some suggestions?
> Thanks.
> Michele Sanges
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