[mapguide-users] Coordinate Conversion from Oracle (King) Failing

[Kenneth, GEOGRAF A/S]

Studio uses the Mentor library, and MGOS uses the PROJ.4.
For me this usually means that I have to manually edit the resources to 
set the projection.
I have no problem using the "Arbitrary XY-M" coordinate system.

AFAIK there is no way to add a coordinate system to PROJ.4, but you may 
construct a WKT for your projection and use that.

Regards, Kenneth, GEOGRAF A/S



Crispin @ 1Spatial skrev:
> Hi (again),
>
> I have Oracle data with a CRSID of 81989 (British National Grid) and
> querying with King 0.7.3 in Studio 2008 - when I build maps I always use an
> arbitrary X-Y (metres) coordinate system because in the UK there is really
> little need to do coordinate conversion.  I "expect" that unknown
> coordinates will be passed straight through (as per MapGuide 6.5) but MGOS
> seems to be more failsafe.
>
> I have added the following lines to my 
> C:\Program Files\Common Files\Autodesk Shared\Gis\CoordSys\11g\mapping.txt
> but to no avail:
> "British National Grid" = "GB_ORD1-MOD"
> "Ordnance Survey Great Brit" = "GB_ORD1-MOD"
>
>
> This is the server error: 
> ERROR 6: Failed to initialize PROJ.4 with `+ellps=airy +units=m +no_defs '.
> projection not named
>
> If I try and preview the data in Studio with the layer I see the WKT of the
> coordinate system and the messaage says "The coordinate system is invalid
> PROJCS <[WKT defn]>"
> Could not create coordinate system forward transformation with specified
> coordinate systems. Exception occurred in method
> MgCoordinateSystem.MgCoordinateSystem at line 77 in file
> c:\build_bond_area\mapguide_open_source_v1.2\build_18.1\mgdev\common\geometry\CoordinateSystem/CoordinateSystem.cpp 
>
> Is Studio erroring based on the Mentor 11g libs it installs and Server
> erroring on PROJ libs?
> Is there a way to add a CS to PROJ?
> It would be nice to define a coordinate system override in the Layer
> definition also...
>
> Any help greatly appreciated,
>
>  Crispin
>
>