[mapguide-internals] MAP Spatial Filter

[Traian Stanev]

Hi Haris,
 
MapGuide is supposed to transform the query region from the map's coord sys to the layer's coord sys before doing the FDO query. The relevant code is at 
MgStylizationUtil::ExecuteFeatureQuery
in StylizationUtil.cpp. Not sure why it is not working for you, but that code was changed recently so it is possible it could be a bug. 
 
Traian
 
P.S. I am not surprised Map is doing a query for an area larger than the limits of LatLon since it does not validate the query rectangle against the limits of the coordinate system (at least as far as I know about that) -- it simply uses 2D math to compute the currently visible region, so if you zoom out on the world map, the query region will be larger than -180,-90,180,90.
 

	-----Original Message----- 
	From: mapguide-internals-bounces at lists.osgeo.org on behalf of Haris Kurtagic 
	Sent: Fri 6/8/2007 3:27 AM 
	To: MapGuide Internals Mail List 
	Cc: 
	Subject: [mapguide-internals] MAP Spatial Filter
	
	

	Hi,
	
	
	
	I have a question what is way that MG will set spatial filter when in
	Map there are layers with different coordinate system's.
	
	I have in test Map layer with Lat/Lon and layers with projected cs.
	
	
	
	MG when querying is sending same extents of Map for both layers geodetic
	and projected.
	
	So when querying against Lat/lon layer MG is setting spatial filter to
	extend in projected coordinates.
	
	
	
	I suppose this is not how it should work ?
	
	
	
	P.S.
	
	Another issue I had is that if for example in Map There is just one
	layer with geoditc cs, Map will set filter bigger than (
	-180,-90,180,90).
	
	
	
	Thanks,
	
	Haris
	
	
	
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