On Saturday, March 13, 2010, Roger André <ran...@gmail.com> 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 which seem to be very well written, but may be slightly out of date?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 : eric.lemo...@camptocamp.com http://www.camptocamp.com _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users
