[mapserver-users] Cascading WMS layer requests in MapServer

[Yewondwossen Assefa]

Hi There,

  MapServer by default should try to merge WMS requests for adjacent 
layers unless specifically asked not to using the metedata 
wms_force_separate_request (http://mapserver.org/ogc/wms_client.html).

  Do you have an example of the full URL of the GetMap request for 2 
adjacent layers that should be merged?  Note that all parameters of the 
2 request should be the same except parameters such as LAYERS, 
QUERY_LAYERS, STYLES that could be different.

Best Regards,

Rob wrote:
> Hi
> 
> I was wondering if anybody knew whether it is possible to combine
> multiple requests to a cascaded WMS service.
> 
> For example, my WMS service has lots of layers in it.  Amongst them
> are six cascaded layers from a 3rd party service.  If a user requests
> all six of those layers in one request currently, it makes six
> individual requests to the 3rd party service in order to draw those
> layers.
> 
> Whilst this makes sense if the layers= parameter has different layers
> in between the 3rd party layers, when 2 or more layers are together,
> surely it would make more sense to make fewer requests where possible.
> 
> Is this something that Mapserver already does and I havent spotted
> it(in the WMS_METADATA for example?) , or is this a future requirement
> ;o) ?
> 
> MTIA
> 
> Rob
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> 


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Assefa Yewondwossen
Software Analyst

Email: assefa at dmsolutions.ca
http://www.dmsolutions.ca/

Phone: (613) 565-5056 (ext 14)
Fax:   (613) 565-0925
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