[mapserver-users] WMS GetMap request - incorrect layer ordering

[John Cartwright]

Thank you both for your suggestions, but I can't seem to get this to work either w/ shp2img or a WMS request.  I've configured the layers as:

LAYER
  NAME countries
  TYPE POLYGON
  STATUS on
  ...  
END

LAYER
  NAME mask
  TYPE POLYGON
  STATUS on
  REQUIRES "[countries]"
...
END

Then requesting 

http://localhost/cgi-bin/basicworld?request=getmap&service=wms&width=500&height=250&bbox=-180,-90,180,90&srs=EPSG:4326&version=1.1.1&layers=countries&format=png

shows the countries layer unmasked.  Explicitly adding the mask to the request as below displays the countries layer masked, but is not a solution for me as I have to enforce the mask.

http://localhost/cgi-bin/basicworld?request=getmap&service=wms&width=500&height=250&bbox=-180,-90,180,90&srs=EPSG:4326&version=1.1.1&layers=countries,mask&format=png


The debugging log suggests that only the countries layer is being requested:

[Tue Oct 18 21:00:20 2011].525713 msDrawMap(): rendering using outputformat named png (AGG/PNG).
[Tue Oct 18 21:00:20 2011].525903 msDrawMap(): WMS/WFS set-up and query, 0.000s
[Tue Oct 18 21:00:20 2011].537968 msDrawMap(): Layer 1 (countries), 0.012s
[Tue Oct 18 21:00:20 2011].537982 msDrawMap(): Drawing Label Cache, 0.000s
[Tue Oct 18 21:00:20 2011].537989 msDrawMap() total time: 0.013s
[Tue Oct 18 21:00:20 2011].555843 msSaveImage(stdout) total time: 0.018s
[Tue Oct 18 21:00:20 2011].555881 mapserv request processing time (msLoadMap not incl.): 0.031s
[Tue Oct 18 21:00:20 2011].555888 msFreeMap(): freeing map at 0x100832600.

Did I misunderstand what you intended?

Thanks again!

--john




On Oct 18, 2011, at 8:06 AM, Daniel Morissette wrote:

> On 11-10-18 04:36 AM, Rahkonen Jukka wrote:
>> Hi,
>> It is also possible to create a mask layer with REQUIRES keywork. The
>> snippet below will make the "mask" layer to draw always when the
>> "countries" layer is drawn. However, it is not automatically drawn if
>> you ask for any other layer. One minory drawback is that the mask layer
>> is also listed in the GetCapabilities as a normal WMS layer.
>> LAYER
>> NAME "mask"
>> ....
>> REQUIRES "[countries]"
>> ...
>> END
> 
> Great suggestion. And with MapServer 6.x you can hide the mask layer from the GetCapabilities using the "ows_enable_request" metadata:
> 
> LAYER
>  NAME "mask"
>  ....
>  REQUIRES "[countries]"
>  METADATA
>    "ows_enable_request" "!GetCapabilities"
>    ...
>  END
>  ...
>  END
> 
> -- 
> Daniel Morissette
> http://www.mapgears.com/
> Provider of Professional MapServer Support since 2000
> 
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