I have have been trying to modify my map using mapagent. I have exported
the resource content and then edited the coordinate system to use the
WKT representation of the projection. I can not seem to get past an
error in the Metadata tag:
'Parser message: In element Metadata: Can not have element children
within a simple type content. '
If I remove the metadata, I get an exception error when trying to open
the map in Studio. My XML is below:
<MapDefinition xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xsi:noNamespaceSchemaLocation="MapDefinition-1.0.0.xsd">
<Name>New Map</Name>
<CoordinateSystem>
PROJCS["unnamed",GEOGCS["unnamed
ellipse",DATUM["unknown",SPHEROID["unnamed",6378137,0]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["Mercator_2SP"],PARAMETER["standard_parallel_1",0],PARAMETER["central_meridian",0],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1],EXTENSION["PROJ4","+proj=merc
+a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0
+units=m [EMAIL PROTECTED] +wktext +no_defs"]]
</CoordinateSystem>
<Extents>
<MinX>0</MinX>
<MaxX>0</MaxX>
<MinY>0</MinY>
<MaxY>0</MaxY>
</Extents>
<BackgroundColor>FFFFFFFF</BackgroundColor>
<Metadata><MapDescription>GoogleTiles</MapDescription></Metadata>
</MapDefinition>
Is there something obvious that I am missing?
Thanks for the help!
George
Jason Birch wrote:
Specifics of this projection are documented at SpatialReference.org:
http://spatialreference.org/ref/user/google-projection/
And Charlie Savage has a good write-up of why it's not just Mercator:
http://cfis.savagexi.com/articles/2006/05/03/google-maps-deconstructed
Note, I have no idea how to add custom projections like this to Proj.4.
I wonder if you would be able to add the WKT representation directly to
your map?
http://spatialreference.org/ref/user/google-projection/ogcwkt/
Jason
-----Original Message-----
From: Traian Stanev
Subject: RE: [mapguide-users] Generating tiles for google maps
Yes, you have to use Mercator. To make the tiles match perfectly across
the whole world, you will need to use a custom Mercator rather than the
default one in MapGuide (last time I did it, I had to hardcode the
projection into MapGuide). I think that if you restrict yourself to a
small region, you can get away with the Mercator that already exists in
MapGuide and some tiny translation tweaks to make it all align
perfectly.
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