[OpenLayers-Users] Problems with maxExtent and blank images (Mapserver and Mapnik)

["tschobber tschöbbi"]

Hi,

I have two layers in Openlayers - one is for rendering Mapnik maps and the other for rendering with Mapserver. Both have the same data from a postgis database and I declare maxExtent (in map options) with the following values: 

var mapOptions = {maxExtent: new OpenLayers.Bounds(384619.116883103,467965.222077892,505102.701298797,534231.193506524),
                                maxResolution:1.6,
                                numZoomLevels:21);

The problem is if maxExtent is declared I can only see the Mapnik generated map but the map generated with Mapserver just stays blank. Otherwise when I remove the maxExtent attribute I'm able to see the Mapserver generated map but not the Mapnik map.
For Mapnik I'm using a xml file but there is just this line at the beginning that could change anything:

"<Map bgcolor="steelblue" srs="+proj=latlong +datum=WGS84">"

Here is the beginning of the Mapserver mapfile:

MAP

  NAME "Map Viewer"
  STATUS ON
  SIZE 2400 1200
  EXTENT -180 -90 180 90                                                         
  SHAPEPATH "data/"
  IMAGECOLOR 255 255 255
  UNITS DD
  OUTPUTFORMAT
                NAME png
                DRIVER "GD/PNG"                                                  
                MIMETYPE "image/png"
                IMAGEMODE RGB
                EXTENSION "png"
        END
        PROJECTION
                "init=epsg:4326"
        END

        WEB
 IMAGEPATH "/tmp/ms_tmp/"
        IMAGEURL "/ms_tmp/"
                METADATA
                "wms_title"     "Map Viewer"
                        "wms_onlineresource"    "http://gaia.geo.at/cgi-bin/mapserv?map=/srv/www/cgi-bin/data/wms.map"
                        "wms_srs"       "EPSG:4326"
        END
        END


LAYER
    CONNECTION "user=root password=pg dbname=air host=titan.geo.at"
    CONNECTIONTYPE POSTGIS
    DATA "the_geom from gd_line_007_3"
      METADATA
      END
    NAME "fluss01"
    PROJECTION
      "init=epsg:31297"
    END
    SIZEUNITS PIXELS
    STATUS ON
    TOLERANCEUNITS PIXELS
    TRANSPARENCY 100
    TYPE LINE
    UNITS METERS
    CLASS
      NAME "class0"
      METADATA
      END
        STYLE
        ANGLE 360
        COLOR 107 174 214
        WIDTH 1
#        SYMBOL 1
      END
    END
  END
                                                      



Below are the two layers defined in Openlayers script:

var mapserver_agg = new OpenLayers.Layer.WMS("AGG Mapserver","http://gaia.geo.at/cgi-bin/mapserv?map=/srv/www/cgi-bin/data/wms3.map",{map_imagetype:'AGG',layers: ['land_grenzen01','layer_mapany_080305_3ba6226287c1622', 'bezirk_grenzen_01', 'land_grenzen01','staat01','fluss01', 'stadt01'],format: 'image/png'},{isBaseLayer:false},{singleTile: true});


var mapnikwms = new OpenLayers.Layer.WMS("MapnikWMS","http://gaia.geo.at/cgi-bin/mapnikwms.py?",{
layers:['land_grenzen01','staat01','fluss01','bezirk_grenzen01'],
styles:['land_grenzen01','staat01','fluss01','bezirk_grenzen01'],
format:'image/png'});


Hope you can help me!

thanks + regards

Martin
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