[OpenLayers-Users] WMS overlay onto google maps

[Richard Duivenvoorde]

Hi Armin,

besides off course install mapserver (and thus proj) and serve those 
overlay layers from there :-)
you can try to learn ArcIms about this projection? I found something 
about defining projection info here:
http://www.spatiallyadjusted.com/2006/12/10/esri-instructional-podcast-on-defining-projection-information-for-arcims-map-services/

You'll probably need information from:
http://www.spatialreference.org/ref/user/google-projection/

But that's all help I can give...

Good luck,

Richard



Armin Wäspy wrote:
> Hi,
>  
> I'm trying to overlay some wms-layers (with arcims) onto google maps and 
> it's not possible to add a new epsg to the ArcIms, so i can't work with 
> epsg900913 like in http://trac.openlayers.org/wiki/SphericalMercator
>  
> is there any other possibility?
>  
> Is there a way to do this?
> 
> 
>  >>> Richard Duivenvoorde <rdmailings at duif.net> 10/25/07 11:44 >>>
> 
> Ok FIXED.... I can confirm myself now. Stuff lines up ok.
> 
> Old mistake: epsg:900913 was ok, but the string for the source
> projection was wrong on the server (old dutch 28992 problem :-( )
> 
> Lining up beautifull now!
> 
> Richard D
> 
> Richard Duivenvoorde wrote:
>  > Hi List,
>  >
>  > I'm trying to overlay a google map with data from postgis database
>  > (roads). On larger scale things seem to be ok, but when zoomed in at
>  > 'meters' scale, roads do not match:
>  > http://www.duif.net/900913-mismatch.jpg
>  >
>  > Question: has somebody experienced this? Or does somebody have an
>  > example of perfect matching of two layers?
>  >
>  > When I look at the multimap mercator example:
>  > http://www.openlayers.org/dev/examples/multimap-mercator.html
>  > zooming in at for example Amsterdam, The Netherlands, I see about the
>  > same mismatch??
>  >
>  > my code:
>  >
>  >   var options = {
>  >        projection: "EPSG:900913",
>  >        units: "m",
>  >        maxResolution: 156543.0339,
>  >        maxExtent: new OpenLayers.Bounds(-20037508, -20037508,
>  >                                            20037508, 20037508.34)
>  >    };
>  >    map = new OpenLayers.Map('map', options);
>  >    var layer = new OpenLayers.Layer.Google( "Google Hybrid", {type:
>  > G_HYBRID_MAP, 'sphericalMercator': true});
>  >    map.addLayer(layer);
>  >
>  >    layer = new OpenLayers.Layer.WMS( "roads",
>  > 'http://localhost/cgi-bin/mapserv.exe?map=test.map&', {layers: 'roads',
>  > 'format':'image/gif', TRANSPARENT:true}, {'buffer': 0, isBaseLayer:
>  > false, singleTile: true} );
>  >
>  > Tried both reprojecting the data in postgis, using
>  > +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0
>  > +k=1.0 +units=m +nadgrids=@null +no_defs
>  > OR
>  > let mapserver reproject the data. Both give about the same shifts...
>  >
>  > TIA
>  >
>  > Richard Duivenvoorde
>  >
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