[mapguide-internals] MapGuide RFC 55 - Switch from PROJ4 to CS-Map coordinate system library

[Jason Birch]

Hi Hugues!
 
Wow, that was quick; maybe GDAL won't beat MapGuide in using CS-Map after all :)
 
I guess the original intention of having a compile-time switch so that users can choose one or the other has gone out the window?  I'm not necessarily against this--it's more overhead to maintain both--just surprised at the change.
 
Will this affect sites that are running MapGuide alongside other open source PROJ.4-based applications that do on-the-fly projections on the same data; is it possible that users see large differences from one application to the next?
 
What are the implications for existing installs?  Is there a potential that spatial contexts have been recorded to the repository (in SC overrides, native map projections, etc) or FDO data stores that are incompatible with CS-Map?  If so, how will we support users running into this problem?  Is there a potential for a utility application that scans the repository and tests whether CS-Map can recognize the WKT so that users can identify and resolve any problems before upgrading?
 
Jason


________________________________

From: Hugues Wisniewski
Subject: [mapguide-internals] MapGuide RFC 55 - Switch from PROJ4 to CS-Map coordinate system library

Hi,

I would like to submit "MapGuide RFC 55 - Switch from PROJ4 to CS-Map coordinate system library" for review and comment.



http://trac.osgeo.org/mapguide/wiki/MapGuideRfc55



Thanks,



Hugues

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