OpenLayers 3 Beginner’s Guide

Creating a vector layer

<!doctype html>
<html>
  <head>
    <title>Vector Examples</title>
    <link rel="stylesheet" href="../assets/ol3/css/ol.css" type="text/css" />
    <link rel="stylesheet" href="../assets/css/samples.css" type="text/css" />
  </head>
  <body>
    <div id="map" class="map"></div>
    <script src="../assets/ol3/js/ol.js"></script>
    <script>
      // create a vector source that loads a GeoJSON file
      var vectorSource = new ol.source.GeoJSON({
        projection: 'EPSG:3857',
        url: '../assets/data/countries.geojson'
      });

      // a vector layer to render the source
      var vectorLayer = new ol.layer.Vector({
        source: vectorSource
      });

      var center = ol.proj.transform([0, 0], 'EPSG:4326', 'EPSG:3857');

      var view = new ol.View({
        center: center,
        zoom: 1
      });

      // the vector layer gets added like a raster layer
      var map = new ol.Map({
        target: 'map',
        layers: [vectorLayer],
        view: view
      });
    </script>
  </body>
</html>