WMS client/cascading wms bounding box problem

[Robert William Jones]

Hi,


I am trying to use MapServer as a WMS client to another WMS (cascading WMS). 
  The request I make is of the form:
http://localhost/cgi-bin/mapserv_44.exe?map=midas.map&version=1.1.1&request=getmap&layers=gs_lay&width=500&height=250&srs=epsg:4326&bbox=0,45,40,65&format=image/png

However, MapServer seems to do something strange to the bounding box as the 
box that is submitted by MapServer (as part of the getmap request) is the 
following:
0.039999999999997732,45.019999999999996,39.960000000000001,64.980000000000004

My map file is set up as follows:

MAP
   STATUS ON
   SIZE 500 250
   EXTENT 0 45 40 65
   SHAPEPATH "./data"
   IMAGECOLOR 0 0 255
   PROJECTION
       "init=EPSG:4326"
   END
     WEB
       IMAGEPATH "/ms4w/tmp/ms_tmp/"
       IMAGEURL "/ms_tmp/"
   END
     OUTPUTFORMAT
       NAME png
       DRIVER "GD/PNG"
       MIMETYPE "image/png"
       IMAGEMODE RGBA
       EXTENSION "png"
   END
     LAYER
       NAME "gs_lay"
       TYPE RASTER
       STATUS ON
       CONNECTION "http://localhost:8080/geoserver/wms?"
       CONNECTIONTYPE WMS
       METADATA
           "wms_srs"             "EPSG:4326"
           "wms_name"            "topp:gfs"
           "wms_server_version"  "1.1.1"
           "wms_format"          "image/png"
           "wms_latlonboundingbox" "0 45 40 65"
       END
   END
END


Does anyone know why the bounding box is being changed, instead of being 
submitted as is?

Many thanks for any help
Robert Jones


Robert William Jones
Software Engineer

ComSine Limited
Telephone:  + 44 (0) 1483 457121
Fax:  + 44 (0) 1483 304836
Mobile: +44 (0) 7939 295868
www.comsine.com

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