[OpenLayers-Users] Getting up and running with OpenLayers

Fri Nov 9 14:45:43 EST 2007

In addition to what Richard said you will also need to call
map.setCenter() or map.zoomToMaxExtent() to actually see something on
the map. Take a look at the wms example
(<http://www.openlayers.org/dev/examples/wms.html>). Good luck.

--
Eric

On Nov 9, 2007 6:13 PM, Richard Duivenvoorde <rdmailings at duif.net> wrote:
> Hi David,
>
> the error you see is because openlayers is asking for a layer in the
> epsg:4326 (default latlon) projection.
>
> You can do two things:
> - either add EPSG:4326 to your WMS_SRS "EPSG:32616" line in the WEB part
> of your mapserver map file
> if your mapserver and proj lib are ok, this will make mapserver project
> your 32616 data to 4326 and you will see latlon projected maps in OL.
>
> But probably you want to see 32616 projected maps, you can do that by
> telling OL that the Map's projection is 32616: something like this:
>
> map = new OpenLayers.Map('map',  {
>    'projection':'EPSG:32616',
>    'units':'m',
>    'maxExtent':new OpenLayers.Bounds(582919,4182989,610195,4207241),
>    });
>
> hope this helps something.
>
> grtz,
> Richard Duivenvoorde
>
> ps have also a look at
> http://www.openlayers.org/dev/examples/projected-map.html
>
>
>
>
>
> drk mattr wrote:
> > I've been reading about OpenLayers on James Fee's blog and I'm really
> > interested in working with it.  I'm a long time ArcIMS developer so the
> > concepts here are close to what I'm used to using (well I'm not used to
> > using JavaScript which is my problem).
> >
> > I've got a mapfile up and running.
> >
> > MAP
> >     NAME Installation
> >     SIZE 800 500
> >     IMAGECOLOR 240 240 240
> >     EXTENT 582919.88200 4182989.235900 610195.822000 4207241.321900
> >     UNITS METERS
> >     PROJECTION
> >       "init=EPSG:32616"
> >     END
> >     WEB
> >         IMAGEPATH "/ms4w/tmp/ms_tmp/"
> >         IMAGEURL "/ms_tmp/"
> >         METADATA
> >           WMS_TITLE "WMS Test"
> >           WMS_ABSTRACT "My attempt at actually moving from ArcIMS to WMS"
> >           WMS_ACCESSCONSTRAINTS "none"
> >
> >          WMS_ONLINERESOURCE "http://localhost:8080/test/test.html"
> >          WMS_SRS "EPSG:32616"
> >        END
> >     END
> >
> >  LAYER
> >   NAME "Installation"
> >   TYPE POLYGON
> >   STATUS DEFAULT
> >   DATA "Installation_Area.shp"
> >
> >   CLASS
> >    NAME 'Installation'
> >    OUTLINECOLOR 60 60 60
> >    COLOR 255 255 0
> >    SYMBOL 0
> >   END
> >  END
> > END
> >
> > Which returns a simple map when I test it:
> > _http://localhost:8080/cgi-bin/mapserv.exe?MAP=/ms4w/apache/htdocs/test/test.map&mode=map_
>
> > <http://localhost:8080/cgi-bin/mapserv.exe?MAP=/ms4w/apache/htdocs/test/test.map&mode=map>
> >
> > Now, I've decided to try OpenLayers and this is my code which I borrowed
> > from one of the examples:
> >
> > <html xmlns="http://www.w3.org/1999/xhtml">
> >   <head>
> >     <style type="text/css">
> >         #map {
> >             width: 800px;
> >             height: 475px;
> >             border: 1px solid black;
> >         }
> >     </style>
> >     <script src="OpenLayers.js"></script>
> >     <script type="text/javascript">
> >         function init(){
> >             map = new OpenLayers.Map( 'map' );
> >             layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
> >
> > "http://localhost:8080/cgi-bin/mapserv.exe?MAP=/ms4w/apache/htdocs/test/test.map",
> > {layers: 'Installation'} );
> >             map.addLayer(layer);
> >         }
> >     </script>
> >   </head>
> >   <body onload="init()">
> >     <div id="map"></div>
> >   </body>
> > </html>
> >
> > When I run it, I get a tiles which say:
> >
> > msWMSLoadGetMapParams():  WMS server error. Invalid SRS given : SRS must
> > be valid for all requested layers.
> >
> > Now I looked at the doc and it seems like you can set the projection
> > which I tried, but it still returned the same error.  I'm sure I'm
> > close, but I'm just a little out of my league right now with openlayers.
> >
> > Any help would be greatly appreciated.
> >
> > David.
> >
> >
> >
> >
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