Advanced Mapbox vector tiles example

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.

mapbox, vector, tiles, mobile
<!DOCTYPE html>
<html>
<head>
<title>Advanced Mapbox vector tiles 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/v3.11.2/css/ol.css" type="text/css">
<script src="http://openlayers.org/en/v3.11.2/build/ol.js"></script>
<script src="http://openlayers.org/en/v3.11.2/examples/resources/mapbox-streets-v6-style.js"></script>
<style>
.map {
  background: #f8f4f0;
}

</style>
</head>
<body>
<div class="container-fluid">

<div class="row-fluid">
  <div class="span12">
    <div id="map" class="map"></div>
  </div>
</div>

</div>
<script>
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 ('http://{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({
      preload: Infinity,
      source: new ol.source.VectorTile({
        attributions: [new ol.Attribution({
          html: '© <a href="https://www.mapbox.com/map-feedback/">Mapbox</a> ' +
              '© <a href="http://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>