turf-intersect

Find the intersection of two Polygon Features.

<!doctype html>
<html lang="en">
  <head>
    <link rel="stylesheet" href="https://rawcdn.githack.com/openlayers/openlayers.github.io/master/en/v5.3.0/css/ol.css" type="text/css">
    <link rel="stylesheet" href="assets/css/styles.css" type="text/css">
    <script src="//cdn.jsdelivr.net/npm/@turf/turf@5/turf.min.js"></script>
    <script src="https://rawcdn.githack.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js" type="text/javascript"></script>
    <title>Turf and OpenLayers 3 - difference</title>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script type="text/javascript">

      var coordinates1 = [[[-3.6474609374999996,48.1367666796927],[1.9335937499999998,50.51342652633956],[7.4267578125,48.777912755501845],[6.1962890625,46.437856895024204],[7.250976562499999,43.644025847699496],[5.9326171875,43.16512263158296],[3.955078125,43.48481212891603],[2.8125,42.74701217318067],[0.5712890625,42.779275360241904],[-1.6259765625,43.389081939117496],[-1.0986328125,45.55252525134013],[-2.1533203125,47.100044694025215],[-3.515625,47.78363463526376],[-3.6474609374999996,48.1367666796927]]];
      var polygon1 = turf.polygon(coordinates1);

      var coordinates2 = [[[-0.52734375,47.040182144806664],[2.28515625,48.28319289548349],[3.1640625,46.830133640447386],[1.845703125,45.706179285330855],[-0.52734375,47.040182144806664]]];
      var polygon2 = turf.polygon(coordinates2);

      var intersect1 = turf.intersect(polygon1, polygon2);

      var coordinates3 = [[[-2.021484375,34.66935854524543],[-1.142578125,32.175612478499325],[-8.876953125,27.761329874505233],[-8.96484375,26.27371402440643],[-11.865234375,25.48295117535531],[-13.0078125,21.69826549685252],[-17.314453125,21.12549763660628],[-13.623046875,27.449790329784214],[-10.1953125,29.305561325527698],[-9.4921875,31.728167146023935],[-8.349609375,33.358061612778876],[-5.80078125,35.67514743608467],[-2.021484375,34.66935854524543]]];
      var polygon3 = turf.polygon(coordinates3);

      var coordinates4 = [[[-7.998046875,27.137368359795584],[-11.77734375,27.449790329784214],[-15.380859374999998,22.43134015636061],[-15.380859374999998,19.31114335506464],[-11.953125,18.646245142670608],[-8.26171875,22.836945920943855],[-7.998046875,27.137368359795584]]];
      var polygon4 = turf.polygon(coordinates4);

      var intersect2 = turf.intersect(polygon3, polygon4);

      // Declare a formatter to read GeoJSON
      var format = new ol.format.GeoJSON();

      // Declare a source
      var vectorSource = new ol.source.Vector();

      // When reading feature, reproject to EPSG 3857
      var feature1 = format.readFeature(intersect1, {
        featureProjection: 'EPSG:3857'
      });
      // Add a feature
      vectorSource.addFeature(feature1);

      // When reading feature, reproject to EPSG 3857
      var feature2 = format.readFeature(intersect2, {
        featureProjection: 'EPSG:3857'
      });

      // Add a feature
      vectorSource.addFeature(feature2);

      // Declare a vector layer with the already
      // created source containing added feature
      var vectorLayer = new ol.layer.Vector({
        source: vectorSource,
        style: [
          new ol.style.Style({
            stroke: new ol.style.Stroke({
              color: [0, 121, 88, 1],
              width: 2
            }),
            fill: new ol.style.Fill({
              color: [0, 0, 88, 0.6]
            })
          })
        ]
      });

      // Instanciate a map and add layers
      var map = new ol.Map({
        target: 'map',
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          }),
          vectorLayer
        ],
        view: new ol.View({
          center: ol.proj.fromLonLat([-3, 35]),
          zoom: 3
        })
      });
    </script>
  </body>
</html>

results matching ""

    No results matching ""