[OSRS-PROJ] PROJ 4.4.6 Release

Frank Warmerdam warmerdam at pobox.com
Tue Mar 4 13:45:36 EST 2003

Daniel Morissette wrote:
> Frank Warmerdam wrote:
>>  o Updated 'espg' translation file for EPSG 6.2.2 with better support for
>>    prime meridians.
> ...
>>  o Added 'esri' pseudo-epsg coordinate system file.
> Frank,
> Do you know the difference between the contents of the epsg file and the
> esri file?  It seems to me that the esri file contains most if not all
> of the epsg codes, plus about a dozen ESRI-specific codes.
> Can you, or someone else confirm that the esri file is just an older
> version of the epsg file to which these 12 ESRI-specific codes have been
> added at the end?  If that's the case then should we update the esri
> file in the distribution to be based on the latest epsg file?


I think it was the guys at Refractions who contributed the esri file.  I
thought it had more than 12 extra coordinate systems but I think that was
due to my not realizing that most of the ESRI coordinate system difference
were due to ESRI using a more recent epsg database than I used to.

I don't know how Refractions derived the 'esri' file ... it may have been
generated from the actual ESRI .prj files for each system in which case it
may differ in meaningful ways from the values derived directly from EPSG.

I am hesitant to change the esri file myself.

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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