[OpenLayers-Users] Overlaying WMS layer on Google maps - help

[Alexandre Dubé]

Hi,

   The OpenLayers.Layer.WMS class takes 4 arguments, see the constructor :
http://dev.openlayers.org/releases/OpenLayers-2.12/doc/apidocs/files/OpenLayers/Layer/WMS-js.html

   So, in your case, you're missing the 3rd argument, "params" 
{object}.  Adding this and having the "options" {object} as your last 
argument should do the trick.

HTH,

Alexandre


On 12-08-20 11:43 AM, modala wrote:
> Hi, I am unable to overlay the WMS map on google maps. Can any one help me
> with this code
> 	function init(){
> 		
> 		/* The full extent/bounds to which the Map can be zoomed */
> 		var fullBounds = new OpenLayers.Bounds(-90, 0, 70, 30);
> 		
> 		/* Map variable is assigned a OpenLayers.Map */
> 		map = new OpenLayers.Map("map", {
> 			div: "map",
> 			controls:[
> 					new OpenLayers.Control.Navigation(
> 						{mouseWheelOptions: {interval: 100}}
> 					),
> 					new OpenLayers.Control.PanZoomBar(),
> 					new OpenLayers.Control.Attribution(),
> 					new OpenLayers.Control.LayerSwitcher(),
> 					//new OpenLayers.Control.Permalink(),
> 					//new OpenLayers.Control.OverviewMap()
> 				],
> 			maxExtent: fullBounds,
> 			projection: new OpenLayers.Projection("EPSG:900913"),
> 			displayProjection: new OpenLayers.Projection("EPSG:4326")
> 		});	
>
> 		/* This is the stylemap which styles i.e. colors, borders, etc the
> selected features and clusters */
> 		var fStyle = new OpenLayers.Style({
>                      pointRadius: "${radius}",
>                      fillColor: "#ffcc66",
>                      fillOpacity: 0.8,
>                      strokeColor: "#cc6633",
>                      strokeWidth: 2,
>                      strokeOpacity: 0.8,
> 					label:"${count}",
> 					fontSize: "9px",
> 					fontWeight: "bold",
>                  }, {
>                      context: {
>                          radius: function(feature) {
>                             /* The radius of the cluster is set based on the
> number of features it contains*/
> 						   return Math.min(feature.cluster.length, 7) + 3;
>                          },						
> 						count: function(feature) {
> 							/* This  displays the count of the features on the clusters */
> 							if (feature.cluster.length>1)
> 								return feature.cluster.length;
> 							else
> 								return "";							
> 						}
>                      }
>                  });
> 		
> 		/* the Thesis variable is assigned a OpenLayers.Layer.Vector */		
> 		thesis = new OpenLayers.Layer.Vector("Thesis", {	
> 			projection: map.displayProjection,	
> 			strategies: [
> 					new OpenLayers.Strategy.Fixed(),
> 					/* Using the cluster strategy clusters the features that are too close
> into clusters. */
> 					new OpenLayers.Strategy.Cluster({
> 						//distance:20 //This value can be changed to change the distance which
> defines when to form clusters
> 					})
> 			],
> 			protocol: new OpenLayers.Protocol.HTTP({
> 				/* The path to the KML files*/
> 				url: "kml_final1.kml",
> 				//url: "georeferences_July19_2_modified.kml",
> 				format: new OpenLayers.Format.KML({
> 					extractAttributes: true,
> 					maxDepth: 1,					
> 				})					
> 			}),
> 			/* This style map says that the default style is the fstyle which is
> defined above, and upon selection, the one defined
> 			   infront of 'select' gets activated */
> 			styleMap: new OpenLayers.StyleMap({
> 					"default": fStyle,
> 					"select": {
> 						fillColor: "#8aeeef",
> 						strokeColor: "#32a8a9",
> 					}
> 			})
> 		});
> 		
> 		/* This is an important function where once all the strategies are done
> loading i.e. the features are done loading, the
> 		   set of features is assigned to the all_featuresArray which was
> initialized earlier.
> 		   thesis.strategies[i] can be selected to choose either the clusters or
> the features, as per the order defined in the Vector	*/
> 		thesis.events.register("loadend", this, function(){		
> 			all_featuresArray = thesis.strategies[1].features;
> 		});				
> 		
> 		/* These are the base layers on top of which the Vector will be displayed
> */
> 		var gmap = new OpenLayers.Layer.Google("Google Streets", {numZoomLevels:
> 20, sphericalMercator: true} );
> 		var gmap_phy =  new OpenLayers.Layer.Google("Google Hybrid",  {type:
> google.maps.MapTypeId.HYBRID, numZoomLevels: 20, sphericalMercator: true});
> 		var osm = new OpenLayers.Layer.OSM('Open Street Maps',
> 'http://tile.openstreetmap.org/${z}/${x}/${y}.png', {numZoomLevels: 20,
> sphericalMercator: true} ); 		
> 		var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
> "http://vmap0.tiles.osgeo.org/wms/vmap0", {isBaseLayer:false});
> 		wms.projection = (map.displayProjection, map.getProjectionObject())
> 		/* Add the above layers to the map */
> 		map.addLayers([ gmap, gmap_phy, osm, wms]);
> 		/* Add the vectors to the Map */
> 		map.addLayers([ thesis]);
> 	
>
>
>
> --
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-- 
Alexandre Dubé
Mapgears
www.mapgears.com