[FWTools] PROJ.dll 4.4.6 vs. 4.5.0

[Frank Warmerdam]

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.

Martin,

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
place.

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

Best regards,
-- 
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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