WMS 512x256 Tiles

Example of a WMS layer with 512x256px tiles.

WMS can serve arbitrary tile sizes. This example uses a custom tile grid with non-square tiles.

<!DOCTYPE html>
<html>
  <head>
    <title>WMS 512x256 Tiles</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/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>

  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import {getWidth} from 'ol/extent.js';
      import TileLayer from 'ol/layer/Tile.js';
      import {get as getProjection} from 'ol/proj.js';
      import OSM from 'ol/source/OSM.js';
      import TileWMS from 'ol/source/TileWMS.js';
      import TileGrid from 'ol/tilegrid/TileGrid.js';


      var projExtent = getProjection('EPSG:3857').getExtent();
      var startResolution = getWidth(projExtent) / 256;
      var resolutions = new Array(22);
      for (var i = 0, ii = resolutions.length; i < ii; ++i) {
        resolutions[i] = startResolution / Math.pow(2, i);
      }
      var tileGrid = new TileGrid({
        extent: [-13884991, 2870341, -7455066, 6338219],
        resolutions: resolutions,
        tileSize: [512, 256]
      });

      var layers = [
        new TileLayer({
          source: new OSM()
        }),
        new TileLayer({
          source: new TileWMS({
            url: 'https://ahocevar.com/geoserver/wms',
            params: {'LAYERS': 'topp:states', 'TILED': true},
            serverType: 'geoserver',
            tileGrid: tileGrid
          })
        })
      ];
      var map = new Map({
        layers: layers,
        target: 'map',
        view: new View({
          center: [-10997148, 4569099],
          zoom: 4
        })
      });
    </script>
  </body>
</html>