Example of integrating Proj4js for coordinate transforms.
With transparent Proj4js integration, OpenLayers can transform coordinates between arbitrary projections.
<!DOCTYPE html> <html> <head> <title>Single image WMS with Proj4js projection example</title> <script src="https://code.jquery.com/jquery-1.11.2.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> <link rel="stylesheet" href="http://openlayers.org/en/3.8.1/css/ol.css" type="text/css"> <script src="http://openlayers.org/en/3.8.1/build/ol.js"></script> <script src="http://cdnjs.cloudflare.com/ajax/libs/proj4js/2.3.6/proj4.js"></script> <script src="http://epsg.io/21781-1753.js"></script> </head> <body> <div class="container-fluid"> <div class="row-fluid"> <div class="span12"> <div id="map" class="map"></div> </div> </div> </div> <script> // Transparent Proj4js support: // // EPSG:21781 is known to Proj4js because its definition was loaded in the html. // Now when we create an ol.proj.Projection instance with the 'EPSG:21781' code, // OpenLayers will pick up parameters like units and transform functions from // Proj4js. // // Note that we are setting the projection's extent here, which is used to // determine the view resolution for zoom level 0. Recommended values for a // projection's validity extent can be found at http://epsg.io/. // // If you use Proj4js only to transform coordinates, you don't even need to // create an ol.proj.Projection instance. ol.proj.get() will take care of it // internally. var projection = new ol.proj.Projection({ code: 'EPSG:21781', extent: [485869.5728, 76443.1884, 837076.5648, 299941.7864] }); var extent = [420000, 30000, 900000, 350000]; var layers = [ new ol.layer.Image({ extent: extent, source: new ol.source.ImageWMS({ url: 'http://wms.geo.admin.ch/', crossOrigin: 'anonymous', attributions: [new ol.Attribution({ html: '© ' + '<a href="http://www.geo.admin.ch/internet/geoportal/' + 'en/home.html">' + 'Pixelmap 1:1000000 / geo.admin.ch</a>' })], params: { 'LAYERS': 'ch.swisstopo.pixelkarte-farbe-pk1000.noscale', 'FORMAT': 'image/jpeg' }, serverType: /** @type {ol.source.wms.ServerType} */ ('mapserver') }) }), new ol.layer.Image({ extent: extent, source: new ol.source.ImageWMS({ url: 'http://wms.geo.admin.ch/', crossOrigin: 'anonymous', attributions: [new ol.Attribution({ html: '© ' + '<a href="http://www.geo.admin.ch/internet/geoportal/' + 'en/home.html">' + 'National parks / geo.admin.ch</a>' })], params: {'LAYERS': 'ch.bafu.schutzgebiete-paerke_nationaler_bedeutung'}, serverType: /** @type {ol.source.wms.ServerType} */ ('mapserver') }) }) ]; var map = new ol.Map({ controls: ol.control.defaults().extend([ new ol.control.ScaleLine() ]), layers: layers, target: 'map', view: new ol.View({ projection: projection, center: ol.proj.fromLonLat([8.23, 46.86], projection), extent: extent, zoom: 2 }) }); </script> </body> </html>