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HTML 

              
                <html>
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
    <title>Geoprocessing - viewshed analysis | Sample | ArcGIS API for JavaScript 4.18</title>
    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
      }

      #paneDiv {
        position: absolute;
        top: 18px;
        right: 18px;
        padding: 12px;
        background-color: rgba(0, 0, 0, 0.5);
        color: white;
        width: 200px;
      }
    </style>

    <link rel="stylesheet" href="https://js.arcgis.com/4.19/esri/themes/light/main.css" />
    <script src="https://js.arcgis.com/4.19/"></script>

    <script>
      require([
        "esri/Map",
        "esri/views/SceneView",
        "esri/layers/GraphicsLayer",
        "esri/Graphic",
        "esri/geometry/Point",
        "esri/tasks/Geoprocessor",
        "esri/tasks/support/LinearUnit",
        "esri/tasks/support/FeatureSet"
      ], function(Map, SceneView, GraphicsLayer, Graphic, Point, Geoprocessor, LinearUnit, FeatureSet) {
        var gpUrl = "https://elevation.arcgis.com/arcgis/rest/services/Tools/Elevation/GPServer/Viewshed";

        var map = new Map({
          basemap: "hybrid",
          ground: "world-elevation"
        });

        var view = new SceneView({
          container: "viewDiv",
          map: map,
          camera: {
            // autocasts as new Camera()
            position: [7.59564, 46.06595, 5184],
            tilt: 70
          }
        });

        var graphicsLayer = new GraphicsLayer();
        map.add(graphicsLayer);

        var markerSymbol = {
          type: "simple-marker", // autocasts as new SimpleMarkerSymbol()
          color: [255, 0, 0],
          outline: {
            // autocasts as new SimpleLineSymbol()
            color: [255, 255, 255],
            width: 2
          }
        };

        var fillSymbol = {
          type: "simple-fill", // autocasts as new SimpleFillSymbol()
          color: [226, 119, 40, 0.75],
          outline: {
            // autocasts as new SimpleLineSymbol()
            color: [255, 255, 255],
            width: 1
          }
        };

        var gp = new Geoprocessor(gpUrl);
        gp.outSpatialReference = {
          // autocasts as new SpatialReference()
          wkid: 102100
        };
        view.on("click", computeViewshed);

        function computeViewshed(event) {
          graphicsLayer.removeAll();

          var point = new Point({            
            longitude: event.mapPoint.longitude,
            latitude: event.mapPoint.latitude
          });

          var inputGraphic = new Graphic({
            geometry: point,            
            symbol: markerSymbol
          });

          graphicsLayer.add(inputGraphic);
          
          var featureSet = new FeatureSet({
            features: [inputGraphic]
          });          
          
          var params = {
            InputPoints: featureSet,
            MaximumDistance: 5.0,
            MaximumDistanceUnits: 'Kilometers',
            ObserverHeight: 15.0,
            ObserverHeightUnits:'Meters'
          };
          
          // SUBMIT JOB //
          //console.info('Job Params: ', params);          
          gp.submitJob(params).then((jobSubmitInfo)=>{   
            // JOB ID //
            const jobId = jobSubmitInfo.jobId;
            console.info('Submit Job: ', jobId);            
            gp.waitForJobCompletion(jobId).then((jobCompletedInfo)=>{
              console.info('Job Completed: ', jobCompletedInfo.jobStatus);            
              gp.getResultData(jobId,'OutputViewshed').then(({value})=>{                                              drawResultData(value);
              });
            });            
          });
        }

        function drawResultData(value) {
          var resultFeatures = value.features;

          // Assign each resulting graphic a symbol
          var viewshedGraphics = resultFeatures.map(function(feature) {
            feature.symbol = fillSymbol;
            return feature;
          });

          // Add the resulting graphics to the graphics layer
          graphicsLayer.addMany(viewshedGraphics);
         
          view.goTo({
            target: viewshedGraphics,
            tilt: 0
          })
          .catch(function(error) {
            if (error.name != "AbortError") {
              console.error(error);
            }
          });
        }
      });
    </script>
  </head>

  <body>
    <div id="viewDiv"></div>
    <div id="paneDiv" class="esri-widget">Click on map to execute ViewShed GP Task</div>
  </body>
</html>
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