[mapserver-users] MapServer seems to always use GDAL driver with cascaded WMS (instead of AGG)

[Rahkonen Jukka]

Hi,

It would help if you could send:
- The WMS GetMap request you are using to reach the WMS server number one (the one with refs.map)
- The image you are getting with bad aliasing
- Corresponding GetMap request that the first WMS is making for the second WMS with roads.map. You will find it from the access.log file
- Image captured with the above GetMap from the second WMS.


-Jukka Rahkonen-


________________________________
Lähettäjä: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] Puolesta SAEZ Laurent - SG/SPSSI/CPII/DOM/ETER/PNE IG
Lähetetty: 26. tammikuuta 2012 15:18
Vastaanottaja: mapserver-users at lists.osgeo.org
Aihe: [mapserver-users] MapServer seems to always use GDAL driver with cascaded WMS (instead of AGG)


Hi,

I have some troubles using AGG with cascaded WMS.

I have my first mapfile that exposes WMS layers (MapServer<http://trac.osgeo.org/mapserver/wiki/MapServer> is used as a WMS server and a WMS client): refs.map
I have a second mapfile that contains a Postgis layer (this mapfile uses only MapServer<http://trac.osgeo.org/mapserver/wiki/MapServer> as WMS server): roads.map
I'm using MapServer<http://trac.osgeo.org/mapserver/wiki/MapServer> 5.6.0 beta 3 on Debian (to avoid WFS requests issues with the following versions cf. http://trac.osgeo.org/mapserver/ticket/4073).
I advertise raster formats with "wms_getmap_formatlist". I define image/png to use AGG driver.
I can get nice PNG with AGG when I request directly my second mapfile roads.map (using mapserver only as WMS server).
But if I request my first mapfile refs.map (that requests my second mapfile using MapServer<http://trac.osgeo.org/mapserver/wiki/MapServer> as WMS client. This is the WMS cascade), I get PNG with bad aliasing (AGG does not seem to be used!).
I looked at the mapserv.log (for the WMS/GetMap that requests the cascaded WMS) and I saw : "msDrawGDAL(): red,green,blue,alpha bands = 1,2,3,4"
Does "msDrawGDAL" meen that DGAL driver is used instead of AGG driver ?

Thanks for your reply.
Laurent

An extract of my first mapfile (refs.map): "MAP ...

OUTPUTFORMAT
    NAME "PNG"
    DRIVER "AGG/PNG"
    MIMETYPE "image/png"
    IMAGEMODE RGBA
    TRANSPARENT ON
END
...
WEB
    ...
    METADATA
    ...
    "wms_getmap_formatlist" "image/png,image/jpg,image/jpeg"
    END
END
LAYER
    NAME "my_layer" ... CONNECTIONTYPE WMS " http://my_domain/cgi-bin/mapserv?map=/my_path/roads.map<http://my_domain/cgi-bin/mapserv?map=/my_path/roads.map>"
    ...
    METADATA
       "wms_name" "my_roads"
       "wms_server_version" "1.1.1"
       "wms_format" "image/png"
       ...
    END
END ...

An extract of my second mapfile (roads.map) : MAP ...

OUTPUTFORMAT
    NAME "PNG"
    DRIVER "AGG/PNG"
    MIMETYPE "image/png"
    IMAGEMODE RGBA
    TRANSPARENT ON
END...
WEB
    METADATA
    ...
    "wms_getmap_formatlist" "image/png,image/jpg,image/jpeg"
    END
END
LAYER
    NAME "my_roads" ... CONNECTIONTYPE postgis
    ...
END

I'm not sure that this behavior should be different with mapserver 6.0...

NB: I've already post this message on Tue, 27 Apr 2010 in the mailing list, but no reply... ;-(
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