[FWTools] PROJ.dll 4.4.6 vs. 4.5.0

Frank Warmerdam warmerdam at pobox.com
Sun Sep 30 02:16:56 EDT 2007

On 9/27/07, Martin Fix <Martin.Fix at ptv.de> wrote:
> Frank,
> thanks for that info.
> We're still wondering why it worked in proj-4.4.6 very well with the WKT and does not in proj-4.5.0. Was there a major change about the shift processing?
> Also this problem is not related only to sphere mercator but for all coordinate systems we use (for example DHDN_GaussKruger_zone1 to zone5 etc.).
> It seems that there has changed something in general which we did not notice.
> Now we're using GDAL 1.4.2 with proj-4.4.6 and it works as it should. But for the future we would like to know how to change to any newer version of proj to be on the safe side.


I believe the ellipsoid to ellipsoid conversion was either
broken, or not yet implemented in some earlier versions of
PROJ.4.  But I too am not too clear on when the change took

I am also coming to the conclusion that this behavior is broken,
and likely needs to be backed out at some point.

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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