on: 0
      });

      var raster &#x3D; new ol.source.Raster({
        sources: [elevation],
        operationType: &#x27;image&#x27;,
        operation: shade
      });

      var map &#x3D; new ol.Map({
        target: &#x27;map&#x27;,
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          }),
          new ol.layer.Image({
            opacity: 0.3,
            source: raster
          })
        ],
        view: new ol.View({
          extent: [-13675026, 44396