WFS layer projection problem

[Martin Weinelt]

Hello list,

we're setting up a mapserver installation to render and
query a scientific data base with global coverage. The 
data base layers are provided as WFS. This WFS has 
DD (epsg:4326) as reference system.
 
The mapserver installation provides for 4 projections which can be
set by the user: DD, Mercator, LAEA (South Pole aspect) and LAEA 
(North Pole aspect). The corresponding values for the resp. keywords 
in the mapfile (eg, PROJECTION) are passed over as CGI-variables 
('&map_projection=...', etc.).

While things run smoothly now with the DD-'projection and the
Mercator, we are facing severe problems with the polar aspect maps.
The points from the WFS-layer get sometimes partly plotted on the 
maps sometimes not at all. In cases, only some of the points you can 
see on the DD- or Mercator-versions show up on the polar aspect maps.
(of course I am talking about the points actually within the scope of
LAEA-covered regions.)

From the logs of the WFS-server we can see, that the mapserver
CGI sometimes sends strange bounding boxes to the WFS, which 
do not really cover the area shown by the map.

Is there anything special with LAEA and mapserver (proj4). Has anyone
encountered s/th similar? Where should we start searching for 
potential solutions to this problem?

Cheers, Martin

PS: You can see the thing by going to "http://www.pangaea.de/PangaVista"
and hitting the 'Show map'-entry in the search form. 
  
Mapfile excerpt:

MAP
  NAME "Pangaea_WMS"
  STATUS ON
  DEBUG ON
  # nb! UNITS passed in by URL
  SIZE 400 400
  IMAGETYPE jpeg
  EXTENT -180 -90 180 90
 
  OUTPUTFORMAT
    NAME jpeg
    DRIVER "GD/JPEG"
    MIMETYPE "image/jpeg"  
    IMAGEMODE RGB
    EXTENSION "jpg"
  END

  FONTSET "/path/to/fonts.list"
  SYMBOLSET "/path/to/symbols.sym"
  # SHAPEPATH "/path/to/data/"
  SHAPEPATH " nb!:passed in by URL"
  
  REFERENCE
    IMAGE "ref/ddindex200.png"
    EXTENT -180 -90 180 90
    SIZE 199 99
    STATUS ON
    COLOR -1 -1 -1
    OUTLINECOLOR 255 0 0
    MAXBOXSIZE 190
  END #  of Reference

  WEB
    METADATA
      "wms_title"                  "pangaea_wms"
      "wms_onlineresource" "http://www.pangaea.de/pvmap/mapserv.cgi?"
      "wms_srs"                    "EPSG:4326"
    END # metadata
    IMAGEPATH "/path/to/tmp/"
    IMAGEURL "/path/to/tmp/"
    LOG "/path/to/pv_ms.log"
    TEMPLATE "/path/to/tmpl.html"  
    EMPTY "/pvmap/nf.html"          # these are URLs
    ERROR "/pvmap/er.html"          # these are URLs
  END #web

  PROJECTION
    # nb!: passed in by URL
  END # projection
....
## then some basic layers, such as coastline, etc
...
## and then the WFS-layer, here the points:
LAYER
    NAME "dataSetPoint"
    METADATA
      "wfs_service"           "WFS"
      "wfs_typename"          "pv:dataSetPoint"
      "wfs_version"           "1.0.0"
      "wfs_request_method"    "GET"
      "wfs_connectiontimeout" "60"
    END
    
    PROJECTION
      "init=epsg:4326"
    END
    DUMP TRUE 
    TYPE POINT
    STATUS on
    CONNECTIONTYPE WFS
    CONNECTION "%wfsurl%"   #this is passed in by a CGI variable
    TOLERANCE 10
 
    CLASS
      NAME "DataSets"
      SYMBOL "circle"
      SIZE 8
      COLOR 220 0 0
      OUTLINECOLOR 120 120 120
      TEMPLATE "/path/to/tmpl.html"
    END # class
  END # Layer