Advanced Mapbox Vector Tiles

Example of a Mapbox vector tiles map with custom tile grid.

A vector tiles map which reuses the same tiles for subsequent zoom levels to save bandwith on mobile devices. Note: No map will be visible when the access token has expired.

<!DOCTYPE html>
<html>
  <head>
    <title>Advanced Mapbox Vector Tiles</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v3.20.0/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>
    <script src="https://openlayers.org/en/v3.20.0/build/ol.js"></script>
    <script src="https://openlayers.org/en/v3.20.0/examples/resources/mapbox-streets-v6-style.js"></script>
    <style>
      .map {
        background: #f8f4f0;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      /* eslint-disable openlayers-internal/no-unused-requires */
      var key = 'Your Mapbox access token from http://mapbox.com/ here';

      // For how many zoom levels do we want to use the same vector tiles?
      // 1 means "use tiles from all zoom levels". 2 means "use the same tiles for 2
      // subsequent zoom levels".
      var reuseZoomLevels = 2;

      // Offset of loaded tiles from web mercator zoom level 0.
      // 0 means "At map zoom level 0, use tiles from zoom level 0". 1 means "At map
      // zoom level 0, use tiles from zoom level 1".
      var zoomOffset = 1;

      // Calculation of tile urls
      var resolutions = [];
      for (var z = zoomOffset / reuseZoomLevels; z <= 22 / reuseZoomLevels; ++z) {
        resolutions.push(156543.03392804097 / Math.pow(2, z * reuseZoomLevels));
      }
      function tileUrlFunction(tileCoord) {
        return ('https://{a-d}.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/' +
            '{z}/{x}/{y}.vector.pbf?access_token=' + key)
            .replace('{z}', String(tileCoord[0] * reuseZoomLevels + zoomOffset))
            .replace('{x}', String(tileCoord[1]))
            .replace('{y}', String(-tileCoord[2] - 1))
            .replace('{a-d}', 'abcd'.substr(
                ((tileCoord[1] << tileCoord[0]) + tileCoord[2]) % 4, 1));
      }

      var map = new ol.Map({
        layers: [
          new ol.layer.VectorTile({
            renderMode: 'vector',
            preload: Infinity,
            source: new ol.source.VectorTile({
              attributions: '© <a href="https://www.mapbox.com/map-feedback/">Mapbox</a> ' +
                '© <a href="https://www.openstreetmap.org/copyright">' +
                'OpenStreetMap contributors</a>',
              format: new ol.format.MVT(),
              tileGrid: new ol.tilegrid.TileGrid({
                extent: ol.proj.get('EPSG:3857').getExtent(),
                resolutions: resolutions
              }),
              tilePixelRatio: 16,
              tileUrlFunction: tileUrlFunction
            }),
            style: createMapboxStreetsV6Style()
          })
        ],
        target: 'map',
        view: new ol.View({
          center: [0, 0],
          minZoom: 1,
          zoom: 2
        })
      });

      // ol.style.Fill, ol.style.Icon, ol.style.Stroke, ol.style.Style and
      // ol.style.Text are required for createMapboxStreetsV6Style()
    </script>
  </body>
</html>