[Proj] EPSG:28992 to EPSG:23031 conversion

Frank Warmerdam warmerdam at pobox.com
Wed Oct 8 12:51:15 EDT 2008

Bart van den Eijnden (OSGIS) wrote:
> Hi Jean-Claude,
> I am using PROJ 4.4.9 so that should not be necessary or am I mistaken?


It is necessary if ED50 is non-trivially different from WGS84 though my
understanding was that the differences were small.  I personally suspect
the problem is either the sterea projection method (there are several
variations of this I believe) or your towgs84 parameters are not ideal.

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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