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

[Andy Morsell]

If anyone has  any insight into how this might be done using MGOS with the
PROJ4 libraries, I would be interested in any details.  I had a recent
inquiry from someone needing to build a coordinate system definition on the
fly and then use that as the basis for a coordinate transformation.  This
would be a regular operation in their application.  

And, once the Mentor libraries are officially open source as Autodesk has
announced they will be and slated for inclusion in MGOS 2.1, how will new
definitions be added?  Obviously the constraint of  having to use Autodesk
Map and the old update procedure is not going to be viable.  Perhaps we will
need RFC's for API methods for adding, changing and deleting coordinate
system definitions.

Thanks.


Andy Morsell, P.E.
Spatial Integrators, Inc.
http://www.SpatialGIS.com

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Maksim Sestic
Sent: Friday, December 14, 2007 1:24 AM
To: mapguide-users at lists.osgeo.org
Subject: RE: [mapguide-users] Adding a Coordinate System to MGE/MGOS


Hi Bruce,

I was hoping that MG had some mistery :-) mechanism of adding new CRSs to
it's common definitions. So, I guess the only procedure to add new CRS to MG
goes like:

1) On a client machine, run Map 3D and add new CRS (Map -> Tools -> Define
Global Coordinate System...)
2) Open folder ...\Program Files\Common Files\Autodesk Shared\GIS\CoordSys
to see definition files
3) On MG server machine, open folder ...\Program
Files\Autodesk\MapGuideEnterprise2008\Server
4) Run csupdate.exe
5) Source folder = the one described in step 2)
6) Destination folder = ...\Program Files\Common Files\Autodesk
Shared\GIS\CoordSys on MG server

I just need to check out if MG Studio shares common CRS definitions with Map
(I guess it does), and if it sees a newly added one when creating a new
MapDefinition. That's how it should work for the MGE. I don't know if Mentor
and Proj4 share common CRS/Datum/etc. definition files (for this to work on
MGOS).

BTW, I have no idea why Map and some other GIS applications use obscure
formats for persisting coordinate system related data. Isn't XML on OGC
standards enough? Is there something to hide? :-) I guess not (
http://www.epsg.org/CurrentDB.html EPSG Geodetic Parameter Dataset ).

Regards,
Maksim Sestic



Bruce Dechant wrote:
> 
> MGE keeps the coordinate system definitions inside the installed 
> Mentor dictionary files which is not stored as OGC WKT.
> Map is typically the tool used to add new coordinate systems to Mentor 
> dictionary files.
> 
> MGOS uses PROJ4 and I'm not familiar with adding new coordinate 
> systems to it. However, it is open source so you have full access to 
> it for modifying.
> 
> MapGuide Studio cannot add new coordinate systems to either MGOS or MGE.
> 
> Bruce
> 
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