[mapguide-users] Studio projection interaction with MGOS

[Paul Spencer]

Max,

the feature source support in Web Studio does not include the ability  
to set projections currently, although we just discovered (yesterday  
in fact) that it is possible to add a small block of xml to the  
FeatureSource in the repository to provide a coordinate system for  
feature sources that do not have a projection.  We are investigating  
the possibility of adding this to WebStudio.

See http://mapguide.osgeo.org/trac/mapguide/wiki/MapGuideRfc6 for a  
description of a new capability that will be added to MapGuide.  This  
describes extending the current behaviour to force the coordinate  
system on feature sources that think they already have one.

For now, if you really need to do this, you can use the mapagent  
(http://localhost:8008/mapguide/mapagent) interface to  
getresourcecontent on your feature source, add a block like this:

   <SupplementalSpatialContextInfo>
     <Name>LL84</Name>
     <CoordinateSystem>PROJCS["CANA83-3TM114",GEOGCS 
["CANA83-3TM114",DATUM["NAD 83",SPHEROID["GRS 80", 
6378137,298.25722210089],TOWGS84[0,0,0,0,0,0,0]],PRIMEM["Greenwich", 
0],UNIT["Degrees", 0.0174532925199433]],PROJECTION["Transverse  
Mercator"],PARAMETER["central_meridian", -114],PARAMETER 
["latitude_of_origin", 0],PARAMETER["scale_factor", 0.9999],PARAMETER 
["false_easting", 0],PARAMETER["false_northing", 0],UNIT["Meter", 1]] 
</CoordinateSystem>
   </SupplementalSpatialContextInfo>

and then use setresource to push the full xml back into the  
repository.  This will only work to provide a coordinate system for  
feature sources that don't have a coordinate system until RFC 6 is in  
place, then it will actually override the coordinate system.


Cheers

Paul




On 7-Feb-07, at 9:40 AM, Clever, Max wrote:

> Hi All,
>
>
>
> I have not been able to get Mapguide Studio or Web Studio to  
> recognize the coordinate system of the “.prj” file when uploading  
> shapefiles to sdf.  After investigating further I have come up with  
> the following comments/conclusisons/questions:
>
>
>
> I don’t think Mapguide Studio assign its Autodesk coordinate  
> systems to MGOS
> or if it does
> How does it interact with the projections.xml file or other  
> projection files needed for MGOS?
>
> The allprojections.xml file does not include all the projections  
> listed in the EPSG file (ie. Michigan State Plane Coordinates  
> listed in meters only).  Are the projections in this file somehow  
> converted to other units when specified?
>
> Where does the data detailed in the kml line in projections.xml  
> come from?  Is there a rigid structure to what can be put in the  
> parameters of this line?
>
>
> Any help on any of the items discussed here would be helpful.  Thanks.
>
>
>
> Max Clever, L.S.I.T.
> maxc at spicergroup.com
>
>
>
>
>
>
>
> _______________________________________________
> mapguide-users mailing list
> mapguide-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapguide-users

+-----------------------------------------------------------------+
|Paul Spencer                          pspencer at dmsolutions.ca    |
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|Chief Technology Officer                                         |
|DM Solutions Group Inc                http://www.dmsolutions.ca/ |
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