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

[John Cartwright]

Thanks Jukka.  Unfortunately, setting "STATUS DEFAULT" forces the mask
layer to the bottom of the draw order so it can't do it's job.

Approaching the problem from a different perspective - are you aware of
any raster processing directive which would clip a layer on the fly?

Thanks again for all your help on this.

--john

On 10/19/2011 03:37 AM, Rahkonen Jukka wrote:
> Hi,
>
> I spent several hours with blind eyes before having a coffee break and now I really hope that it is this easy: Change the mask layer to STATUS DEFAULT.
>
> Logic is: Draw the mask layer always (STATUS DEFAULT) but because of REQUIRES only if the condition is fulfilled. Mask should not appear with your other layers.
>
> -Jukka Rahkonen-
>
>
> John Cartwright wrote:
>> Lähetetty: 19. lokakuuta 2011 6:12
>> Vastaanottaja: mapserver-users at lists.osgeo.org
>> Aihe: Re: [mapserver-users] WMS GetMap request - incorrect 
>> layer ordering
>>
>> 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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>>> mapserver-users at lists.osgeo.org
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