[OpenLayers-Users] WFS reprojection on Google Maps

Wed May 4 09:51:01 EDT 2011

Hi Luis

I remember having trouble getting this right when I first started using openlayers. Once I figured it out, I kept using the same basic setup so I don't remember the details, but this is what I use for my map options. Perhaps give them a try.

var options = {
                // the "community" epsg code for spherical mercator
                projection: "EPSG:900913",
                displayProjection: new OpenLayers.Projection("EPSG:4326"),

                // map horizontal units are meters
                units: "m",

                // this resolution displays the globe in one 256x256 pixel tile
                maxResolution: 78271.51695,

                // these are the bounds of the globe in sperical mercator
                maxExtent: new OpenLayers.Bounds(-20037508, -20037508,
                                                 20037508, 20037508)
            };
hth
charles

On May 4, 2011, at 5:51 AM, Luís de Sousa wrote:

> Dear all,
> 
> I've been trying to reproject WFS layers on Google Maps without
> success. After reading several threads here and elsewhere it became
> apparent that WFS 1.1.0 takes care of reprojections by itself, without any
> processing needed client side. Hence I tried simply to reproject the
> Tazmania shapes from Geoserver on a Google Maps base layer; while the
> WFS layers are indeed there, they do not seem to have been reprojected:
> 
> http://www.flickr.com/photos/46630302@N04/5686739802/in/set-72157626519940667/
> 
> Below goes the code, note that I'm using a local version of Geoserver
> on port 8090. I'd thank if anyone could hint at what I'm missing.
> 
> Thanks,
> 
> Luís
> 
> -----
> 
> <html xmlns="http://www.w3.org/1999/xhtml">
>   <head>
>       <style type="text/css">
>           #map {
>               width: 560px;
>               height: 460px;
>               border: 1px solid black;
>           }
>       </style>
> 
>       <script src="http://localhost:8090/geoserver/www/OpenLayers-2.9/OpenLayers.js"
> type="text/javascript"></script>
> 
>       <!-- Google API-->
>       <script src='http://maps.google.com/maps?file=api&amp;v=2&amp;key=ABQIAAAAjpkAC9ePGem0lIq5XcMiuhR_wWLPFku8Ix9i2SXYRVK3e45q1BQUd_beF8dtzKET_EteAjPdGDwqpQ'></script>
> 
>       <script defer="defer" type="text/javascript">
> 
>       function init(){
> 
>           var map = new OpenLayers.Map("map", {
>               projection: new OpenLayers.Projection("EPSG:900913")
>           });
> 
>           var gphy = new OpenLayers.Layer.Google(
>               "Google Physical",
>               {type: G_PHYSICAL_MAP}
>           );
> 
>           var roads = new OpenLayers.Layer.WFS(
>               "Roads",
>               "http://localhost:8090/geoserver/wfs",
>               {typename: 'topp:tasmania_roads'},
>               {
>                   typename: 'tasmania_roads',
>                   featureNS: 'http://www.openplans.org/topp',
>                   extractAttributes: false,
>                   version: "1.1.0",
>                   srsName: "EPSG:900913"
>               }
>           );
>           roads.style = OpenLayers.Util.applyDefaults(
>               {strokeWidth: 2, strokeColor: "#ff0000"},
>               OpenLayers.Feature.Vector.style["default"]);
> 
>           var states = new OpenLayers.Layer.WFS(
>               "States",
>               "http://localhost:8090/geoserver/wfs",
>               {typename: 'topp:tasmania_state_boundaries'},
>               {
>                   typename: 'tasmania_state_boundaries',
>                   featureNS: 'http://www.openplans.org/topp',
>                   extractAttributes: false,
>                   version: "1.1.0",
>                   srsName: "EPSG:900913"
>               }
>           );
>           states.style = OpenLayers.Util.applyDefaults(
>               {strokeWidth: 3, strokeColor: "#333333"},
>               OpenLayers.Feature.Vector.style["default"]);
> 
>           map.addLayers([gphy, roads, states]);
> 
>           map.addControl(new OpenLayers.Control.Navigation());
>           map.addControl(new OpenLayers.Control.LayerSwitcher());
> 
>           map.setCenter(new OpenLayers.LonLat(147, -42), 7);
> 
>       }
>       </script>
> 
>   </head>
>   <body onload="init()">
>       <h5>This is a reprojection test on Google Maps.</h5>
>       <div id="map"> </div>
>   </body>
> </html>
> _______________________________________________
> Users mailing list
> Users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/openlayers-users