OpenLayers 3 Google Maps API by ThomasG77

Use OL3 and Google Maps together

This GIST provides an example of a Google Maps map with an OL3 map as control, to give users a Google base map with OL3 content on top.

Open the corresponding bl.ock to view the example in your browser.

Warning!

This integration between Google Maps and OL3 is rough. Do not use it in production!

Why doesn’t OL3 include a Google Maps source?

This question very often comes up on the OL3 mailing list. The short answer is because Google doesn’t allow us to directly access their tiles. See Paul Spencer’s post on the OL3 mailing list for a more complete explanation.

index.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="chrome=1">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <link rel="stylesheet" href="https://openlayers.org/en/v4.6.5/css/ol.css" type="text/css">
    <style type="text/css">
    body {
      width: 960px;
      height: 500px;
      position: relative;
    }
    #map {
      width: 100%;
      height: 100%;
    }
    div.fill {
      width: 100%;
      height: 100%;
    }
    </style>
    <script src="//maps.google.com/maps/api/js?v=3&amp;sensor=false"></script>
    <title>Google Maps integration example</title>
  </head>
  <body>
    <div id="map" class="map">
      <div id="gmap" class="fill"></div>
      <div id="olmap" class="fill"></div>
    </div>
    <script src="https://openlayers.org/en/v4.6.5/build/ol.js" type="text/javascript"></script>
    <script type="text/javascript">
    var gmap = new google.maps.Map(document.getElementById('gmap'), {
      disableDefaultUI: true,
      keyboardShortcuts: false,
      draggable: false,
      disableDoubleClickZoom: true,
      scrollwheel: false,
      streetViewControl: false
    });

    var view = new ol.View({
      // make sure the view doesn't go beyond the 22 zoom levels of Google Maps
      maxZoom: 21
    });
    view.on('change:center', function() {
      var center = ol.proj.transform(view.getCenter(), 'EPSG:3857', 'EPSG:4326');
      gmap.setCenter(new google.maps.LatLng(center[1], center[0]));
    });
    view.on('change:resolution', function() {
      gmap.setZoom(view.getZoom());
    });

    var vector = new ol.layer.Vector({
      source: new ol.source.Vector({
        url: 'countries.json',
        format: new ol.format.GeoJSON()
      }),
      style: new ol.style.Style({
        fill: new ol.style.Fill({
          color: 'rgba(255, 255, 255, 0.6)'
        }),
        stroke: new ol.style.Stroke({
          color: '#319FD3',
          width: 1
        })
      })
    });

    var olMapDiv = document.getElementById('olmap');
    var map = new ol.Map({
      layers: [vector],
      interactions: ol.interaction.defaults({
        altShiftDragRotate: false,
        dragPan: false,
        rotate: false
      }).extend([new ol.interaction.DragPan({kinetic: null})]),
      target: olMapDiv,
      view: view
    });
    view.setCenter([0, 0]);
    view.setZoom(1);

    olMapDiv.parentNode.removeChild(olMapDiv);
    gmap.controls[google.maps.ControlPosition.TOP_LEFT].push(olMapDiv);
    </script>
  </body>
</html>