[mapserver-users] Question on the layer order impact in a Getmap(WMS) call

[Barend Köbben]

The WMS GetMap interface standard requires layers to be drawn in order
(bottom to top) they appear in the LAYERS= statement in the request. So that
overrides the order in the MAP file...


-- 
Barend Köbben
International Institute for Geo-Information
Sciences and Earth Observation (ITC)
PO Box 6, 7500AA Enschede, The Netherlands
+31 (0)53 4874253



On 03-12-09 21:59, "Martin Ouellet" <geomartino at gmail.com> wrote:

> The mapserver doc specified that the layer are drawn in their order of
> appearance in the MapFile (first layer is at the bottom, last is on top).
> Extract from: http://umn.mapserver.ch/MapServer/en/layer.htm
> 
> So I wonder why the map is different if I change the order of the layers
> (CEHQ_STATION_CEHQ_NIVEAU_NIV2 = point layer and CEHQ_BASSIN_N1_NIVEAU =
> polygon layer) in the call?
> Should Mapserver generate the map considering the layer order in the mapfile
> (bottom to top) and not with the order in the URL call?
> 
> With this call, the polygon are on top:
> http://spssoww5d.sso.msp.gouv.qc.ca/cgi-wms/adnIntranet?LAYERS=CEHQ_STATION_CE
> HQ_NIVEAU_NIV2,CEHQ_BASSIN_N1_NIVEAU&TRANSPARENT=true&FORMAT=image/png&SERVICE
> =WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application/vnd.ogc.se_in
> image&SRS=EPSG:900913&BBOX=-8397907.6360637,5657903.782736,-7510015.1156621,61
> 29367.3731146&WIDTH=1452&HEIGHT=771
> 
> With this call, the point are on top (which I would like to have always)
> http://spssoww5d.sso.msp.gouv.qc.ca/cgi-wms/adnIntranet?LAYERS=CEHQ_BASSIN_N1_
> NIVEAU,CEHQ_STATION_CEHQ_NIVEAU_NIV2&TRANSPARENT=true&FORMAT=image/png&SERVICE
> =WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=application/vnd.ogc.se_in
> image&SRS=EPSG:900913&BBOX=-8397907.6360637,5657903.782736,-7510015.1156621,61
> 29367.3731146&WIDTH=1452&HEIGHT=771
> 
> Do I forgot something?
> 
> MartinO
> 
> 
> 
> 
> 

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