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

Tue Oct 18 01:36:25 PDT 2011

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

-Jukka Rahkonen-

________________________________
Lähettäjä: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta John Cartwright
Lähetetty: 17. lokakuuta 2011 8:33
Vastaanottaja: Matt McClelland
Kopio: mapserver-users at lists.osgeo.org
Aihe: Re: [mapserver-users] WMS GetMap request - incorrect layer ordering

Thanks for your reply Matt.  The GROUP idea works and, if I name the GROUP the same as the layer I'm attempting to mask, seems to prevent the unmasked layers from displaying.  However, since it appears that a layer can only be in one GROUP, this means that I have to duplicate my inline mask layer for each image layer I'm attempting to mask.

--john

On Oct 16, 2011, at 5:18 PM, Matt McClelland wrote:

My understanding is that the order you list the WMS layers is the order in which they will be layed down

Try adding
   GROUP "default"
to the layers you want displayed

then use &layers=default in you WMS call.

Hope that helps.

Matt  :)

On Mon, Oct 17, 2011 at 7:28 AM, Rahkonen Jukka <Jukka.Rahkonen at mmmtike.fi<mailto:Jukka.Rahkonen at mmmtike.fi>> 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<mailto:mapserver-users-bounces at lists.osgeo.org> [mapserver-users-bounces at lists.osgeo.org<mailto:mapserver-users-bounces at lists.osgeo.org>] käyttäjän John Cartwright [john.c.cartwright at comcast.net<mailto:john.c.cartwright at comcast.net>] puolesta
> Lähetetty: 15. lokakuuta 2011 19:02
> Vastaanottaja: mapserver-users at lists.osgeo.org<mailto: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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