[mapserver-users] Cascading Mapserver - WMS client - GetLegendGraphic ?

[Andrew Cowie]

Hello list,

We have a cascading WMS using Mapserver as a client to request maps from another Mapserver. We have it working well, however we are wondering whether it is possible to do a GetLegendGraphic request to this top level Mapserver and have it in turn pass on that request to the underlying mapserver, which would then return the legend graphic.

Here's a snippet of our 'top level' Mapserver mapfile, which sits on our public server:
...
       LEGEND
              STATUS OFF
              KEYSIZE 30 15
              KEYSPACING 10 10
              LABEL
                     COLOR 0 0 0
                     FONT 'arialbd'
                     TYPE truetype
                     SIZE 10
              END
       END
       LAYER
              NAME 'coastpoly'
              TYPE RASTER
              CONNECTIONTYPE WMS
              CONNECTION "http://ourprivateserver/wms?"
              PROCESSING "CLOSE_CONNECTION=DEFER"

              METADATA
                     "wms_name"                  "coastpoly"
                     "wms_title"                 "Topographic Coastline Polygons"
                     "wms_server_version"        "1.1.1"
                     "wms_format"                "image/png"
                     "wms_srs"                   "EPSG:2193 EPSG:27200 EPSG:4326"
              END
       END
...

And a snippet from our underlying Mapserver:
...
       LEGEND
              STATUS OFF
              KEYSIZE 30 15
              KEYSPACING 10 10
              LABEL
                     COLOR 0 0 0
                     FONT 'arialbd'
                     TYPE truetype
                     SIZE 10
              END
       END
       LAYER
              NAME 'coastpoly'
              TYPE POLYGON
              STATUS OFF
              CONNECTIONTYPE postgis
              CONNECTION "dbname='ourdb' host='ourprivateserver' port=5432 user='user' password=pass"
              PROCESSING "CLOSE_CONNECTION=DEFER"
              DATA 'the_geom FROM "data"."coastlinepoly" USING UNIQUE gid USING srid=2193'
              PROJECTION
                     "proj=tmerc" "lat_0=0" "lon_0=173" "k=0.9996" "x_0=1600000" "y_0=10000000" "ellps=GRS80" "towgs84=0,0,0,0,0,0,0" "units=m"
              END
              EXTENT 983515.7211 4728776.8709 2117458.3527 6223676.2306
              METADATA
                     "wms_name"                  "coastpoly"
                     "wms_title"                 "Topographic Coastline Polygons"
                     "wms_version"               "1.1.1"
                     "wms_format"                "image/png"
                     "wms_srs"                   "EPSG:2193 EPSG:27200 EPSG:4326"
                     "wms_abstract"              "Abstract"
              END
              CLASS
                     NAME 'Coast Polygon'
                     STYLE
                            COLOR 225 223 197
                     END
              END
       END
...

I think we may be missing something obvious here, so any ideas greatly appreciated... :)

Andrew


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