[mapguide-users] WMS featuresource + projection problem

[Kenneth Skovhede, GEOGRAF A/S]

I don't have a solution, but here is what I do know:

MapGuide does not support raster reprojection yet, but its in the making.
If you create a new map and insert your raster, you will get the message 
below.
The error message explains that the map does not have a coordinate 
system, so you can't
convert the raster to the other projection (which is empty).

You could send in a enhancement request and ask that an empty coordinate 
system
should skip the re-projection (an obvious default IMO).

Apparently MapGuide makes a map on-the-fly for the WMS request, and
for some reason, it will not set the projection for the map.

Have you tried to set the projection override on the raster to
something like "XY-M" and see if you get another error message?

Beware that currently MapGuide Studio uses the Mentor projection library,
where as MGOS uses the PROJ.4 library, so if you pick a coordinate system
in Studio, it might not work in MGOS.

This will change as Autodesk has purchased the Mentor library, and 
released it
as open source, and it will be included in the next version of MapGuide.

For now you can try to set the coordinate system override using Maestro,
as it uses the actual server coordinate systems:
http://trac.osgeo.org/mapguide/wiki/maestro

Regards, Kenneth Skovhede, GEOGRAF A/S



web skrev:
>
> Hi all,
> I have a wms feature source which natively outputs datas whith the 
> fellowing projection:
> EPSG:21781 (swiss grid)
>
> My Map projection is also set as CH1903.LV03/01 (CH1903.LV03/01) 
> (swiss grid)
> so the feature source should be compatible. By accessing this layer I 
> got the fellowing error:
>
>
>   - MgMappingUtil.StylizeLayers line 786 file 
> d:\build\mapguide_open_source_v2.0\build_30.11\mgdev\server\src\services\mapping\MappingUtil.cpp 
> Failed to stylize layer: orthophoto
> Raster transformation is not supported.
> The coordinate system (EPSG:21781) of layer orthophoto cannot be 
> different than the coordinate system () of the map.
>
> It seems that mapguide did not recognize the projection used in the 
> map, if we look at the message: "cannot be different than the 
> coordinate system () of the map". The parenthese is empty...
>
> - Is raster reprojection really impossible, like the stack trace tells?
> - Do I have to set something for the proj4 library?
>
> any hint about adding a WMS feature source with another native 
> projection than WGS84 would be appreciated :-)
>
> Rémy
>
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>
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