[mapguide-internals] [mapguide-users] Adding a Coordinate System to MGE/MGOS

[Maksim Sestic]

Does anyody know if future MG Mentor-based API will get implemented as a
fully "separate" engine, or is it going to get tightly integrated with
MgGeometryFactory? Sort of JTS way of dealing with it - if I create a CRS
definition object, will it be possible to pass it directly to
MgGeometryFactory to have resulting MgGeometryFactory.CreateSomeGeometry()
transformed into given CRS?

Another thing - what about underlying FDO, shouldn't it have Mentor
libraries implemented in first place? I haven't seen any 3.3.0 RFC related
to it. Will Mentor implementation affect existing FDO providers?

Regards,
Maksim Sestic



Bruce Dechant wrote:
> 
> The current thinking is that we will still support both PROJ4 and Mentor.
> Perhaps a compile time flag to control which you want to use - details
> have not been worked out.
> The intention is to still release Mentor under LGPL.
> 
> For the modifying/creating/deleting coordinate systems this is much easier
> with Mentor because the Mentor API supports it and we (Autodesk) are
> familiar with using it to do these tasks (ie: Map can already do this).
> The CS API in 2.0 currently has APIs for updating the coordinate system
> dictionaries, but the PROJ4 implementation currently throws "not
> implemented exceptions" when you try to use these APIs. We wanted to get
> the updated CSAPI framework in place so that when Mentor is open sourced
> users will be able to benefit right away. For PROJ4 it would be nice if
> someone in the open source community more familiar with PROJ4 would update
> these to actually do what is needed.
> 
> Bruce
> 
> -----Original Message-----
> From: mapguide-internals-bounces at lists.osgeo.org
> [mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Jason
> Birch
> Sent: Friday, December 14, 2007 1:34 PM
> To: MapGuide Internals Mail List
> Subject: [mapguide-internals] RE: [mapguide-users] Adding a Coordinate
> System to MGE/MGOS
> 
> Is the current thinking that we pull PROJ.4 entirely out of MapGuide, or
> that we continue to support both projection engines through some kind of
> configuration?
> 
> I see that making Mentor the default projection engine would solve a lot
> of headaches for users of Studio and Map 3D, I wonder if there may be
> users who will want to continue using PROJ.4 in MapGuide to match the CS
> transforms used in their other open source applications.
> 
> The press releases have indicated that Mentor will be released under
> LGPL.  Is that still the intention?
> 
> Frank, (anyone?) do you have any thoughts on how PROJ.4 and Mentor will
> be co-existing in the future?
> 
> Jason
> 
> -----Original Message-----
> From: Bruce Dechant
> Subject: RE: [mapguide-users] Adding a Coordinate System to MGE/MGOS
> 
> Once Mentor is open sourced you will be able to use the MapGuide API
> directly to add/modify/delete coordinate system definitions.
> The API is already in open source 2.0 right now it is just not hooked up
> to PROJ4.
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