[Proj] datum does not change?

[Frank Warmerdam]

On Mon, 21 Mar 2005 21:03:40 +0100, Robert Jaeschke <robert-j at gmx.de> wrote:
> Hello,
> 
> Why do I always get the same result? Changing the datum doesn't seem to
> have an effect on the output? I expect something that is much nearer to
> "12d10'27.403"E  51d41'38.33"N" than the result below.
> 
> Thank you for your help!
> 
> Robert Jaeschke

Robert,

The proj and invproj commands do not utilize datum information. If
you want to convert locations between two datums you will need
to use the cs2cs commandline program.  The proj and invproj
programs stick strictly to the projection<->lat/long conversion on the
stated ellipsoid. 

Best regards,
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