WMS without Projection

This example uses OpenLayers v4.0.1. The latest is v.

#### WMS without Projection

Example of two WMS layers using the projection EPSG:21781, which is unknown to the client.

As long as no coordinate transformations are required, OpenLayers works fine with projections that are only configured with a `code` and `units`.

Related API documentation:

- ol.Map
,
- ol.View
,
- ol.layer.Image
,
- ol.layer.Tile
,
- ol.proj.Projection
,
- ol.source.ImageWMS
,
- ol.source.TileWMS

Copy Edit
WMS without Projection Example of two WMS layers using the projection EPSG:21781, which is unknown to the client. var layers = [ new ol.layer.Tile({ source: new ol.source.TileWMS({ attributions: '© <a href="http://www.geo.admin.ch/internet/geoportal/' + 'en/home.html">Pixelmap 1:1000000 / geo.admin.ch</a>', crossOrigin: 'anonymous', params: { 'LAYERS': 'ch.swisstopo.pixelkarte-farbe-pk1000.noscale', 'FORMAT': 'image/jpeg' }, url: 'https://wms.geo.admin.ch/' }) }), new ol.layer.Image({ source: new ol.source.ImageWMS({ attributions: '© <a href="http://www.geo.admin.ch/internet/geoportal/' + 'en/home.html">National parks / geo.admin.ch</a>', crossOrigin: 'anonymous', params: {'LAYERS': 'ch.bafu.schutzgebiete-paerke_nationaler_bedeutung'}, serverType: 'mapserver', url: 'https://wms.geo.admin.ch/' }) }) ]; // A minimal projection object is configured with only the SRS code and the map // units. No client-side coordinate transforms are possible with such a // projection object. Requesting tiles only needs the code together with a // tile grid of Cartesian coordinates; it does not matter how those // coordinates relate to latitude or longitude. var projection = new ol.proj.Projection({ code: 'EPSG:21781', units: 'm' }); var map = new ol.Map({ layers: layers, target: 'map', view: new ol.View({ center: [660000, 190000], projection: projection, zoom: 9 }) }); <div id="map" class="map"></div>

    <!DOCTYPE html>
    <html>
      <head>
        <title>WMS without Projection</title>
        <link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css">
        <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
        <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
        <script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script>
      </head>
      <body>
        <div id="map" class="map"></div>
        <script>
          var layers = [
            new ol.layer.Tile({
              source: new ol.source.TileWMS({
                attributions: '© <a href="http://www.geo.admin.ch/internet/geoportal/' +
                    'en/home.html">Pixelmap 1:1000000 / geo.admin.ch</a>',
                crossOrigin: 'anonymous',
                params: {
                  'LAYERS': 'ch.swisstopo.pixelkarte-farbe-pk1000.noscale',
                  'FORMAT': 'image/jpeg'
                },
                url: 'https://wms.geo.admin.ch/'
              })
            }),
            new ol.layer.Image({
              source: new ol.source.ImageWMS({
                attributions: '© <a href="http://www.geo.admin.ch/internet/geoportal/' +
                    'en/home.html">National parks / geo.admin.ch</a>',
                crossOrigin: 'anonymous',
                params: {'LAYERS': 'ch.bafu.schutzgebiete-paerke_nationaler_bedeutung'},
                serverType: 'mapserver',
                url: 'https://wms.geo.admin.ch/'
              })
            })
          ];

          // A minimal projection object is configured with only the SRS code and the map
          // units. No client-side coordinate transforms are possible with such a
          // projection object. Requesting tiles only needs the code together with a
          // tile grid of Cartesian coordinates; it does not matter how those
          // coordinates relate to latitude or longitude.
          var projection = new ol.proj.Projection({
            code: 'EPSG:21781',
            units: 'm'
          });

          var map = new ol.Map({
            layers: layers,
            target: 'map',
            view: new ol.View({
              center: [660000, 190000],
              projection: projection,
              zoom: 9
            })
          });
        </script>
      </body>
    </html>