[mapserver-users] MapServer as WMS

[Rahkonen Jukka]

Hi,
 
Let's hope this is correct information. MAP-WEB-METADATA-"wms_srs" is listing the projections which are supported for the whole service. Individual layers may give more projections if they are given in LAYER-METADATA. 
 
If there is not wms_extent set on LAYER metadata Mapserver is trying to calculate it for you on-the-fly. At least older versions did not do that for tileindex layers, and with some database sources querying the extents may be slow and especially with Oracle very slow, so giving extents in the metadata may be a good idea.
 
BBOX in the WMS GetMap is always in the output projection so yes, you need to have some conversion in your planned system.
 
Finally, you will need some code of your own ot to use a ready made client for making WIDTH and HEIGHT proportional to BBOX.  WMS is accepting anything and projects the output to fit the request.
 
-Jukka Rahkonen-
 
 


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	Lähettäjä: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta David Hildebrand
	Lähetetty: 9. marraskuuta 2010 20:09
	Vastaanottaja: mapserver-users at lists.osgeo.org
	Aihe: [mapserver-users] MapServer as WMS 
	
	

	I am trying to configure MapServer as a WMS service and would like some clarity on projection information.  I have several layers in differing projections but would like the final output to be in Transverse Mercator.  For each layer I have defined the "wms_srs" and "wms_extent" tags.  In the top-level map file do I now define the "wms_srs" tag as a list of projections which are defined in the layers or is there a wildcard specification I can use?  Furthermore, I want to be able to specify the bounding box in lat/lon rather than Transverse Mercator coordinates, the desired output projection.  I suppose I need to have a CGI script call a projection utility to return the bounding box coordinates projected to Transverse Mercator and then pass those to mapserv.  On a related note, how do I set the output WIDTH and HEIGHT to be proportional to the BBOX?

	 

	Thanks.

	 

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	David V. Hildebrand
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