Merge several layers into a single multi-layer GetMap request

[Yewondwossen Assefa]

Hi There,

  I am nopt sure why would this happen. Cheking the code, the criteria 
for merging is the following (mapwmlalayer.c around line 927) :

   if (!bForceSeparateRequest &&
         lastconnectiontype == MS_WMS &&
         psLastWMSParams != NULL &&
         sThisWMSParams.numparams == psLastWMSParams->numparams &&
         strcmp(sThisWMSParams.onlineresource,
                psLastWMSParams->onlineresource) == 0)

    which translates into :

       - no metadata set force_separate_request
       - number of parameters are the same between 2 requests 
(parameters being all the manadatory and non manadory request parameters)
       - the onlineresource should be the same.

  Adding a wmss_sld_body would only end up adding one paramater. If all 
your consececutive layers follow these criterias, It shoudl merge.

  Thinking about It and reading the doc, I am not sure why the number of 
parameters is added into the test.

Later,


J. Parapar wrote:
> Hi all
> 
> We have several wms layers with the same wms server in our mapfile
> client and MapServer is making one GetMap request for each of the
> layers. All the layers have the parameter wms_sld_body set to AUTO. In
> some tests with layers without SLD MapServer do merges several layers
> into a single multi-layer GetMap request. Does this optimization only
> works with non SLD layers?
> 
> Thanks in advance,
> Jorge
> 
> 

-- 
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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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