Hi Eric,
I appreciate the link to documentation, and have tried to apply the
information it contains. The best I can do with it is below. It
looks ok, until you start to pan the map, at which point the WMS layer
slides right off.
<html>
<head>
<title>OpenLayers Example</title>
<script
src='http://dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=6.1'></script>
<script src="http://openlayers.org/api/OpenLayers.js";></script>
</head>
<body>
<div style="width:80%; height:80%" id="map"></div>
<script defer='defer' type='text/javascript'>
// Code goes here
var options = {
projection: new OpenLayers.Projection("EPSG:900913"),
units: "m",
maxResolution: 156543.0339,
maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34,
20037508.34, 20037508.34)
};
map = new OpenLayers.Map('map', options);
// create Virtual Earth layer
var vemap = new OpenLayers.Layer.VirtualEarth("Virtual Earth",
{
sphericalMercator: true,
maxExtent: new
OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34)
});
// create WMS layer
var wms = new OpenLayers.Layer.WMS(
"World Map",
"http://labs.metacarta.com/wms/vmap0";,
{'layers': 'basic', 'transparent': true}
);
map.addLayers([vemap, wms]);
map.zoomToMaxExtent();
</script>
</body>
</html>
---------------------------------
On Sat, Mar 13, 2010 at 12:07 AM, Eric Lemoine
<[email protected]> wrote:
>
> On Saturday, March 13, 2010, Roger André <[email protected]> wrote:
> > Hi All,I'm trying to resolve some strange behavior in my OpenLayers map. I
> > am using a BING maps base layer, and a GeoJson feature collection layer.
> > Both layers display in the map, but the GeoJson layer "acts funny". For
> > one thing, it is slightly offset from where it should be located, and for
> > another, it doesn't move with the BING base layer when I pan the map.
> > I am trying to follow the instructions at
> > http://docs.openlayers.org/library/spherical_mercator.html#spherical-mercator,
> > which seem to be very well written, but may be slightly out of date? For
> > example, the doc says to instantiate a new VirtualEarth layer by doing this:
> >
> > var layer = new OpenLayers.Layer.VirtualEarth("Virtual Earth",
> > { sphericalMercator: true,
> > maxExtent: new
> > OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34)
> > });
> >
> >
> > But the current examples show using this syntax:
> >
> > var roads = new OpenLayers.Layer.VirtualEarth("Road Map",
> > { type: VEMapStyle.Shaded,
> > numZoomLevels: 21 }
> > );
> >
> >
> > In any case, I can't seem to figure out how to apply the projection
> > instructions that are on the doc. Also, I'm not sure if a projection
> > mismatch is causing the problem I'm seeing, but I figure it's a place to
> > start.
> >
> > Would appreciate some advice regarding how to troubleshoot this.
>
> Hi
>
> <http://trac.openlayers.org/wiki/FrequentlyAskedQuestions#WhydontmyvectorfeaturesworkoverGoogleYahooVirtualEarthetc.>
>
> (this a link to the old FAQ, as the new one is currently out of order.)
>
> You should use the EPSG:900913 projection in your map and set
> "sphericalMercator" to true in your VirtualEarch layer. See the
> spherical-mercator.html example. Also, the vector data (GeoJSON)
> should be in EPSG:900913, unless you reproject it client side. If you
> use either the fixed or BBOX strategy set "projection" to the your
> data projection (e.g. new OpenLayers.Projection("EPSG:4326")) in the
> layer to havr OpenLayers reproject the data to the map projection
> before adding it to the layer.
>
> Cheers,
>
> --
> Eric Lemoine
>
> Camptocamp France SAS
> Savoie Technolac, BP 352
> 73377 Le Bourget du Lac, Cedex
>
> Tel : 00 33 4 79 44 44 96
> Mail : [email protected]
> http://www.camptocamp.com
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