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

Sun Oct 16 20:32:55 EDT 2011

Hi Jukka,

I appreciate your interest and understand your point.  However in my case I have an image of global extent, but I want to restrict the portion of it that's available to the WMS request.  I'd hoped that the EXTENT element at the MAP and/or LAYER levels would do this.  Since that doesn't work, I'm trying a workaround of using an inline FEATURE to mask out all but the area I wish to expose.  I'm using the "STATUS default" because  I cannot depend on the user to specify the mask layer w/ each request.

--john

On Oct 16, 2011, at 2:28 PM, Rahkonen Jukka wrote:

> Hi,
> 
> Somehow I feel that using STATUS DEFAULT layers with WMS is against the idea of the standard which has obviously been that user gets exactly those layers which are ordered from the service with &layers=.   Configuring server to always send some layers may be useful sometimes but righ now I cannot imagine when. Can you give a few examples? 
> 
> -Jukka Rahkonen-
> 
> John Cartwright wrote:
> 
>> Thanks for your reply Jukka.  The reason for the single layer in the WMS request is that the other layer has a
>> "STATUS default" which I understood to mean that it was always returned regardless of the value in the WMS
>> layers parameter.  Indeed this has been my experience,  problem is that the default layer is always at the
>> bottom of the draw order.
> 
> --john
> 
> On Oct 15, 2011, at 10:54 AM, Rahkonen Jukka wrote:
> 
>> Hi,
>> 
>> You had only one layer in your WMS request but I suppose it was just an accident. Layers in WMS request should be respected so that the first layer goes to the bottom and next ones above it. Order in the mapfile should not matter. I can't say about your installation but it seems to behave correctly for me with Mapserver 6.0
>> Compare this one with toilets first in the request
>> http://188.64.1.61/cgi-bin/mapserv?map=/usr/map/osm-mapserver_i.map&REQUEST=GetMap&SERVICE=WMS&VERSION=1.1.1&WIDTH=459&HEIGHT=353&LAYERS=POI_toilet%2Cdefault&TRANSPARENT=TRUE&FORMAT=image%2Fpng&BBOX=436293.7193914731,6903411.337404243,436601.3555717845,6903647.929063611&SRS=EPSG:3067&STYLES=
>> and this with toilets last
>> http://188.64.1.61/cgi-bin/mapserv?map=/usr/map/osm-mapserver_i.map&REQUEST=GetMap&SERVICE=WMS&VERSION=1.1.1&WIDTH=459&HEIGHT=353&LAYERS=default%2CPOI_toilet&TRANSPARENT=TRUE&FORMAT=image%2Fpng&BBOX=436293.7193914731,6903411.337404243,436601.3555717845,6903647.929063611&SRS=EPSG:3067&STYLES=
>> 
>> -Jukka Rahkonen-
>> ________________________________________
>> Lähettäjä: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org] k&#228;ytt&#228;j&#228;n John Cartwright [john.c.cartwright at comcast.net] puolesta
>> Lähetetty: 15. lokakuuta 2011 19:02
>> Vastaanottaja: mapserver-users at lists.osgeo.org
>> Aihe: [mapserver-users] WMS GetMap request - incorrect layer ordering
>> 
>> Hello All,
>> 
>> I'm finding a difference between the image produced by shp2img and a WMS GetMap request.  The image produced by shp2img looks as I expect honoring the order in which LAYERS are defined in the map file and the STATUS value.  However, the WMS request does not seem to respect the order of the LAYERs, always drawing the polygons first regardless of the order defined in the map file or that of the WMS LAYERS request parameter.
>> 
>> Here's a representative WMS request:
>> 
>> 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
>> 
>> Both the cities and countries layers display as you'd expect, but the countries draw on top of the cities contrary to what I'd expect and different that in the shp2img output.
>> 
>> I'm using mapserver version 6.0.1 and I've tried various versions of WMS.  Can someone please examine the map file below and point out what I'm doing wrong?
>> 
>> Thanks!
>> 
>> --john
>> 
>> 
>> MAP
>>  NAME basicworld
>>  SIZE 720 360
>>  EXTENT -180 -90 180 90
>>  UNITS DD
>>  SHAPEPATH "/Users/jcc/shapefiles"
>>  IMAGETYPE PNG
>> 
>>       WEB
>>     IMAGEPATH "/Library/WebServer/Documents/output"
>>     IMAGEURL "/output/"
>> 
>>     METADATA
>>        "ows_title" "BasicWorld Server"
>>        "ows_onlineresource" "http://localhost/cgi-bin/basicworld?"   ##required
>>        "ows_srs" "EPSG:4326"
>>        "ows_onlineresource"   "http://localhost/cgi-bin/basicworld?"  ## Recommended
>>       "ows_enable_request" "*"
>>     END
>>  END
>> 
>>  PROJECTION
>>     "init=epsg:4326"   ##required
>>  END
>> 
>>  SYMBOL
>>     NAME 'circle'
>>     TYPE ELLIPSE
>>     POINTS 1 1 END
>>     FILLED TRUE
>>  END
>> 
>> LAYER
>>       NAME countries
>>       TYPE POLYGON
>>       STATUS on
>>       DATA "country"
>>       CLASS
>>               OUTLINECOLOR 0 0 0
>>               COLOR 167 167 167
>>       END
>> END  # layer
>> 
>> LAYER
>>       NAME cities
>>       TYPE POINT
>>       STATUS default
>>       DATA "cities"
>>       CLASS
>>               SYMBOL 'circle'
>>               SIZE 6
>>               COLOR 204 153 255
>>       END
>> END  # layer
>> 
>> END # Map File_______________________________________________
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> 