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HTML

              
                <html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
  <!--
  ArcGIS API for JavaScript, https://js.arcgis.com
  For more information about the elevation-query-points sample, read the original sample description at developers.arcgis.com.
  https://developers.arcgis.com/javascript/latest/sample-code/elevation-query-points/index.html
  -->
<title>Query Elevation (points) - 4.10</title>
  <style>
    html,
    body,
    #viewDiv {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
    }

    #paneDiv {
      position: absolute;
      top: 12px;
      left: 62px;
      width: 80%;
      padding: 0 12px 0 12px;
      background-color: rgba(255, 255, 255, 0.85);
      border: 1px solid white;
      color: black;
    }

    #resultsDiv {
      font-size: 1.2em;
      text-align: center;
      border-bottom: 1px solid gray;
      padding: 10px 0px;
    }

    #activeElevationLayerDiv {
      margin: 10px 0;
    }

    ul #red {
      color: rgb(150, 26, 15);
    }

    ul #green {
      color: rgb(21, 150, 15);
    }

    ul span {
      color: black;
    }

    ul {
      margin: 0 0 10px 0;
    }

  </style>

  <link rel="stylesheet" href="https://js.arcgis.com/4.10/esri/css/main.css">
  <script src="https://js.arcgis.com/4.10/"></script>

  <script>
    require([
      "esri/Map",
      "esri/views/SceneView",
      "esri/Graphic",
      "esri/geometry/Polyline",
      "esri/layers/ElevationLayer",
      "esri/core/promiseUtils"
    ], function (
      Map, SceneView, Graphic, Polyline, ElevationLayer,
      promiseUtils
    ) {

      // Create elevation layers
      var beforeLandslideUrl =
        "https://sampleserver6.arcgisonline.com/arcgis/rest/services/OsoLandslide/OsoLandslide_Before_3DTerrain/ImageServer/";
      var afterLandslideUrl =
        "https://sampleserver6.arcgisonline.com/arcgis/rest/services/OsoLandslide/OsoLandslide_After_3DTerrain/ImageServer/";

      var beforeLandslideLayer = new ElevationLayer({
        url: beforeLandslideUrl
      });
      var afterLandslideLayer = new ElevationLayer({
        url: afterLandslideUrl
      });

      // Create Map and View
      var map = new Map({
        basemap: "satellite",
        ground: {
          layers: [beforeLandslideLayer, afterLandslideLayer]
        }
      });

      var view = new SceneView({
        container: "viewDiv",
        map: map,
        camera: {
          // initial view:
          heading: 332.8,
          tilt: 65.5,
          position: {
            x: -13563643,
            y: 6153016,
            z: 577,
            spatialReference: {
              wkid: 3857
            }
          }
        }
      });

      // Initialize symbols
      var afterPointSymbol = {
        type: "point-3d", // autocasts as new PointSymbol3D()
        symbolLayers: [{
          type: "object", // autocasts as new ObjectSymbol3DLayer()
          material: {
            color: [150, 26, 15]
          },
          resources: {
            primitive: "sphere"
          },
          width: 8
        }]
      };

      var beforePointSymbol = {
        type: "point-3d", // autocasts as new PointSymbol3D()
        symbolLayers: [{
          type: "object", // autocasts as new ObjectSymbol3DLayer()
          material: {
            color: [21, 150, 15]
          },
          resources: {
            primitive: "sphere"
          },
          width: 8
        }]
      };

      var lineSymbol = {
        type: "line-3d", // autocasts as new LineSymbol3D()
        symbolLayers: [{
          type: "line", // autocasts as new LineSymbol3DLayer()
          material: {
            color: [150, 26, 15]
          },
          size: 1
        }]
      };

      var resultsContainer = document.getElementById("resultsDiv");

      view.on("click", function (event) {
        resultsContainer.innerHTML = "Querying elevation...";

        // Query both elevation layers for the elevation at the clicked map position
        var position = event.mapPoint;
        var queryBeforeLandslide = beforeLandslideLayer.queryElevation(position);
        var queryAfterLandslide = afterLandslideLayer.queryElevation(position);

        // When both query promises resolve execute the following code
        promiseUtils.eachAlways([queryBeforeLandslide, queryAfterLandslide])
          .then(function (results) {
            var posBeforeLandslide = results[0].value.geometry;
            var posAfterLandslide = results[1].value.geometry;

            // Clear graphics from previous result (if applicable)
            view.graphics.removeAll();

            // Draw a point graphic for position before landslide
            view.graphics.add(new Graphic({
              geometry: posBeforeLandslide,
              symbol: beforePointSymbol
            }));

            // Draw a point graphic for position after landslide
            view.graphics.add(new Graphic({
              geometry: posAfterLandslide,
              symbol: afterPointSymbol
            }));

            // Draw a vertical line that illustrates the elevation difference
            var lineGeometry = new Polyline({
              spatialReference: posBeforeLandslide.spatialReference,
              hasZ: true
            });
            lineGeometry.addPath([posBeforeLandslide, posAfterLandslide]);
            view.graphics.add(new Graphic({
              geometry: lineGeometry,
              symbol: lineSymbol
            }));

            // Compute and display the difference in elevation
            var elevationDifference = Math.abs(posBeforeLandslide.z - posAfterLandslide.z);
            resultsContainer.innerHTML = "Elevation difference: " + elevationDifference.toFixed(
              2) + " m";
          })
          .catch(function (error) {
            resultsContainer.innerHTML = "Elevation query failed (" + error.message + ")";
          });
      });

      // When both elevation layers are set "visible", the surface is defined by the latter layer (afterLandslideLayer).
      // Thus we can toggle between "before" and "after" by toggling the visibility of afterLandslideLayer.
      document.getElementById("elevAfter").addEventListener("change", function (event) {
        afterLandslideLayer.visible = event.target.checked;
        beforeOrAfter = event.target.checked ? "after" : "before";
      });
    });

  </script>
</head>

<body>
  <div id="viewDiv"></div>
  <div id="paneDiv">
    <div id="resultsDiv">Click on the map to see the difference in elevation
      before and after the landslide.</div>
    <div id="activeElevationLayerDiv">
      Legend:
      <ul>
        <li id="green">
          <span>Surface point before landslide</span>
        </li>
        <li id="red">
          <span>Surface point after landslide</span>
        </li>
      </ul>
      <input type="checkbox" id="elevAfter" checked>
      <label for="elevAfter">Show surface after landslide</label>
    </div>
  </div>
</body>

</html>
              
            
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