[OpenLayers-Users] My map is displayed only at zoom level 0

[Alexandre Dube]

amila.maha wrote:
> Hi,
>
> I am trying to display a map from MapServer in OpenLayer. But it is
> displayed only when the zoom level is zero. When the zoom level is some
> other level, only a white image is shown. 
>
> Can somebody help me with this??
>
> This is my javascript code segment for creating the map.
>
> var map_sv = new OpenLayers.Layer.MapServer( "Clouds",
> 	
> "http://localhost:7788/cgi-bin/mapserv.exe?map=C:/ms4w/Apache/htdocs/openlayer/map/wms-test.map",
> 		{layers: "clouds", isBaseLayer: "true"});
>   

Your layer object is wrong, it should looks like this : 
OpenLayers.Layer.MapServer(name, url, params, options).
"layers" is a parameter for mapserver cgi url and "isBaseLayer" is an 
OpenLayers option :

var map_sv = new OpenLayers.Layer.MapServer( 
    "Clouds",	
    "http://localhost:7788/cgi-bin/mapserv.exe?map=C:/ms4w/Apache/htdocs/openlayer/map/wms-test.map",
    {layers: "clouds"},
    {isBaseLayer: "true"});


That might not be enough to resolve your problem but it's another fix at 
least.

See the examples for more easy learning :
http://openlayers.org/dev/examples/
http://openlayers.org/dev/examples/mapserver.html

Regards,

Alexandre

>
> This is my map file.
>
> NAME "WMS-test"
> STATUS ON
> SIZE 512 256
> SYMBOLSET ../etc/symbols.sym
> EXTENT -180 -90 180 90
> UNITS METERS
> IMAGECOLOR 255 255 255
> IMAGETYPE png
> FONTSET ../etc/fonts.txt
> CONFIG "PROJ_LIB" "C:/ms4w/proj/nad/"
>
>
> WEB	
>   IMAGEPATH "C:/ms4w/tmp/"
>   IMAGEURL "/ms_tmp/"
>   METADATA
>     "wms_title"     "WMS Demo Server"  ##required
>     "wms_onlineresource" "http://localhost:7788/cgi-bin/mapserv.exe?"  
> ##required
>     "wms_srs"				"EPSG:42304 EPSG:42101 EPSG:4269 EPSG:4326"    
>   END
> END
>
> PROJECTION
>   "init=epsg:42304"   ##required
> END
>
> #
> # Start of layer definitions
> #
>
> LAYER
>  NAME clouds
>  METADATA
>     "wms_title"    "Clouds"   ##required
>   END
>  TYPE RASTER
>  STATUS ON
>  PROJECTION
>     "init=epsg:42304"   ##recommended
>  END
>  DATA "../data/test/day_clouds.tif"
> END
>
> END # Map File
>
>
>
>
>   


-- 
Alexandre Dubé
Mapgears
www.mapgears.com