[OpenLayers-Users] WMS Question

[Eric Lemoine]

Hi. You need your WMS to serve images projected in ESPG:900913 for
that layer. OpenLayers won't do the 4326 to 900913 re-projection of
the images. Eric

2008/9/18, Jeff_Hobbs at sjwater.com <Jeff_Hobbs at sjwater.com>:
> Hi,
>
> I've got an application using the Yahoo basemap. It's loosely based on the
> sphericalmercator example. I'd like to make a WMS in SRS 4326 as a third
> basemap/base layer. I can add the WMS, however it doesn't appear on my
> map. I'm guessing it's a projection issue. Is there a way to get it to
> align to my Yahoo basemaps? If so, any code suggestions would be greatly
> appreciated as I'm new to both OL and javascript. My WMS connection info
> is right here:
> --------------------------------------------------------------
>  	            // create 2006 SCLARCO imagery WMS
> 		    var sclarcoImagery = new OpenLayers.Layer.WMS( "2006
> Imagery",
>                 "http://devinside.sjwater.com/ecwp/ecw_wms.dll?",
>                  {layers: "SCLARCO_2006", transparent: "false",
> singleFile: "true", srs: "EPSG:4326", format: "image/jpeg",
> sphericalMercator: "true"}, {isBaseLayer: true}, {tileSize: new
> OpenLayers.Size(256,256), buffer: 1});	
> ---------------------------------------------------------------
>
> All of my code is below:
>
> ----------------------------------------------------------------
>
> Thanks in advance for any feedback!
>
> Jeff
>
>
>
>
> var map;
> 		var blow =
> OpenLayers.Layer.SphericalMercator.forwardMercator(-122.22565, 37.12293);
> // left bottom
>             var bhigh =
> OpenLayers.Layer.SphericalMercator.forwardMercator(-121.68114, 37.50074);
> // right top
> 		 	
>  	        // avoid pink tiles
>  	        OpenLayers.IMAGE_RELOAD_ATTEMPTS = 3;
>  	        OpenLayers.Util.onImageLoadErrorColor = "transparent";
>  	
> 			function init(){
>  	
> 	      // Create a styleMap to style your features for two
> different
>             // render intents.  The style for the 'default' render intent
> will
>             // be applied when the feature is first drawn.  The style for
> the
>             // 'select' render intent will be applied when the feature is
>             // selected.
>             var stationStyles = new OpenLayers.StyleMap({ // This is only
> for stations
>                 "default": new OpenLayers.Style({
>                     fillColor: "#006699",
>                     strokeColor: "#ff9933",
>                     strokeWidth: 2,
> 					fillOpacity: 0.6
>                 }),
>                 "select": new OpenLayers.Style({
>                     fillColor: "#006699",
>                     strokeColor: "#ff9933",
> 					strokeWidth: 2,
> 					fillOpacity: 1
>                 })
>             });
> 				
> 			    var options = {
>  	                projection: new
> OpenLayers.Projection("EPSG:900913"),
>  	                displayProjection: new
> OpenLayers.Projection("EPSG:4326"),
>  	                units: "m",
> 	                //maxResolution: 156543.0339,
> 					'maxResolution': "auto",
>  	                maxExtent: new OpenLayers.Bounds(blow.lon,
> blow.lat, bhigh.lon, bhigh.lat),					
> 					maxScale: 200,
>                     minScale: 50000,
>                     numZoomLevels: 25
>  	            };
>  	            map = new OpenLayers.Map('map', options);
> 				
> 				// Add the pan/zoom toolbar to all of the
> layers on the map
> 				var panel = new
> OpenLayers.Control.NavToolbar();
> 				map.addControl(panel);	 	
>  	            	
>  	            // create Yahoo layers
>  	            var yahoo = new OpenLayers.Layer.Yahoo(
>  	                "Yahoo Street",
>  	                {'sphericalMercator': true}
> 	            );
>  	
>  	            var yahoohyb = new OpenLayers.Layer.Yahoo(
>  	                "Yahoo Hybrid",
>  	                {'type': YAHOO_MAP_HYB, 'sphericalMercator': true}
>  	            );
>  	
>  	            // create 2006 SCLARCO imagery WMS
> 				var sclarcoImagery = new
> OpenLayers.Layer.WMS( "2006 Imagery",
>                 "http://devinside.sjwater.com/ecwp/ecw_wms.dll?",
>                  {layers: "SCLARCO_2006", transparent: "false",
> singleFile: "true", srs: "EPSG:4326", format: "image/jpeg",
> sphericalMercator: "true"}, {isBaseLayer: true}, {tileSize: new
> OpenLayers.Size(256,256), buffer: 1});				
> 				
> 			    // SJWC Stations KML file
> 				stationKML = new
> OpenLayers.Layer.GML("Station", "data/station.kml",
> 		       {
> 			    projection: new OpenLayers.Projection
> ("EPSG:4326"),
> 				format: OpenLayers.Format.KML,
> 				styleMap: stationStyles,
> 				formatOptions: {
> 				   extractStyles: false, //Use the style
> map above
> 				   extractAttributes: true
> 				}
> 			});
> 			
> 				
> 				map.addLayers([yahoo, yahoohyb,
> sclarcoImagery, stationKML]);
>  	            map.addControl(new
> OpenLayers.Control.LayerSwitcher());
> 				map.addControl(new
> OpenLayers.Control.Permalink());
> 	            map.addControl(new
> OpenLayers.Control.MousePosition());
>  	            if (!map.getCenter()) {map.zoomToMaxExtent()}
>  	        }
> 			    // This it the function that can be called to
> "pan" the map from station to station
> 				// NOTE: Need to make sure you translate
> the WGS lat/long to SphericalMercator!				
> 				var locateMe = function(lon, lat, zoom) {
> 				var myTransCoord =
> OpenLayers.Layer.SphericalMercator.forwardMercator(lon, lat)
> 				map.setCenter(new
> OpenLayers.LonLat(myTransCoord.lon, myTransCoord.lat), zoom);
>             }
>  	
>  	    </script>
>
>
>
> --------------------------------
> Jeff Hobbs
> GIS Coordinator
> San Jose Water Company (NYSE:SJW)
> 1265 South Bascom Avenue
> San Jose, CA 95128
> Voice - (408) 279-7833
> Cell - (408) 314-6342
> Fax - (408) 279-7889
> jeff_hobbs at sjwater.com
> http://www.sjwater.com
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