[OpenLayers-Users] WMS overlay onto google maps

[Armin Wäspy]

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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> 
> 

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