[gdal-dev] Adding Datums to GDAL

[Frank Warmerdam]

Pascoe, S (Stephen) wrote:
> OK I was showing my naivety with thinking GDAL didn't have EPSG:27700 
> pre-configured.  Please ignore the the first half of my query.  However, 
> having reinstalled Proj4 (4.6.0) and gdal-1.5.0, I still have the same 
> problem:
>  
> $ gdalwarp -t_srs EPSG:27700 -te -100000 -100000 600000 600000 -ts 400 
> 400 map.tif trans.tif
> ERROR 6: Failed to initialize PROJ.4 with `+proj=tmerc +lat_0=49 
> +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy 
> +datum=OSB36 +units=m +no_defs '.

Stephen,

I see the OGRSpatialReference:exportToProj4() method has a bug and is
translating this as datum=OSB36 instead of datum=OSGB36 as it ought.  I
have filed a bug and will fix it shortly in trunk and 1.5 branches.

   http://trac.osgeo.org/gdal/ticket/2160

Briefly though, just edit gdal/ogr/ogr_srs_proj4.cpp and change OSB36
to OSGB36 to fix the problem.

Thanks for bringing this to my attention.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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