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Find the elevations of multiple points | CesiumJS

Learn how to find elevation values of points along a path in New Zealand's South Island with the Elevation service.

Find the elevations of multiple points using API key authentication Find the elevations of multiple points using user authentication

The Elevation service is a location service that returns elevation values for a single location or multiple locations. Elevation coverage is provided for both topography (land elevations) and bathymetry (water depths) and takes location inputs as longitude and latitude coordinates.

In this tutorial, you use the Elevation service to return elevation values for points along a path in New Zealand's South Island. The values will be returned as measures above mean sea level in meters.

Mapping and location services guide

To learn more about the service, go to Elevation service.

Prerequisites

An ArcGIS Location Platform account.

Steps Get the starter app

Select a type of authentication below and follow the steps to create a new application.

You can choose one of the following to create a new CodePen:

  1. Go to the Display a scene tutorial and download the solution.
  2. Unzip the folder and open it in a text editor of your choice, such as Visual Studio Code. The starter app includes the following:
Set up authentication

Create developer credentials in your portal for the type of authentication you selected.

Create a new API key credential with the correct privileges to access the resources used in this tutorial.

  1. Go to the Create an API key tutorial and create an API key with the following privilege(s):
  2. Copy the API key access token to your clipboard when prompted.

Create a new OAuth credential to register the application.

  1. Go to the Create OAuth credentials for user authentication tutorial to create an OAuth credential.
  2. Copy the Client ID and Redirect URL from your OAuth credentials item and paste them to a safe location. They will be used in a later step.
Note

To use this application, users must have an ArcGIS account with the necessary privileges to access all resources and services.

Set developer credentials

Use the API key or OAuth developer credentials created in the previous step in your application.

  1. Add <script> elements in the HTML <body> and create an accessToken variable to store your access token. Set YOUR_ACCESS_TOKEN with the access token you previously copied from your API key credentials.

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  <script>

    /* Use for API key authentication */
    const accessToken = "YOUR_ACCESS_TOKEN";

  </script>

  2. Set the defaultAccessToken included with Cesium to authenticate requests to the ArcGIS services used in this tutorial.

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  <script>

    /* Use for API key authentication */
    const accessToken = "YOUR_ACCESS_TOKEN";

    Cesium.ArcGisMapService.defaultAccessToken = accessToken;

  </script>

  1. In both the index.html and callback.html files, set the properties of clientId and redirectUri with the client ID and redirect URL of your OAuth credentials.

    index.html

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    /* Use for user authentication */
    const clientId = "YOUR_CLIENT_ID"; // Your client ID from OAuth credentials
    const redirectUri = "YOUR_REDIRECT_URI"; // The redirect URL registered in your OAuth credentials
    const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
      clientId,
      redirectUri,
      portal: "https://www.arcgis.com/sharing/rest" // Your portal URL
    })

    const accessToken = session.token;

    callback.html

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    arcgisRest.ArcGISIdentityManager.completeOAuth2({
      clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
      redirectUri: "YOUR_REDIRECT_URI", // The redirect URL registered in your OAuth credentials
      portal: "https://www.arcgis.com/sharing/rest" // Your portal URL
    })

  2. Run the app and ensure you can sign in successfully.

    If you are unable to sign in, make sure you have the correct redirect URL and port. This URL varies based on your application and typically takes the format of https://<server>[:port]/callback.html or http://my-arcgis-app:/auth. For example, if you are running an application on http://127.0.0.1:5500/, set http://127.0.0.1:5500/callback.html as your redirect URL in the index.html and callback.html file and your developer credential. They all have to match!

  3. Set the defaultAccessToken included with Cesium to authenticate requests to the ArcGIS services used in this tutorial.

    index.html

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    Cesium.ArcGisMapService.defaultAccessToken = accessToken;
Add script references

Reference the ArcGIS REST JS request and elevation packages to access the Elevation service.

  1. Reference the request and elevation packages from ArcGIS REST JS.

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  <script src="https://cesium.com/downloads/cesiumjs/releases/1.132/Build/Cesium/Cesium.js"></script>
  <link href="https://cesium.com/downloads/cesiumjs/releases/1.132/Build/Cesium/Widgets/widgets.css" rel="stylesheet">

  <!--  ArcGIS REST JS  -->
  <script src="https://unpkg.com/@esri/arcgis-rest-request@4/dist/bundled/request.umd.js"></script>
  <script src="https://unpkg.com/@esri/arcgis-rest-elevation@1/dist/bundled/elevation.umd.js"></script>
Update the map

  1. To focus on South Island, New Zealand, update the map's viewpoint to 169.0016, -44.7023 and set the scale to 20000.

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    viewer.camera.setView({
      destination: Cesium.Cartesian3.fromDegrees(169.0016, -44.7023, 20000),
      orientation: {
        heading: Cesium.Math.toRadians(0.0),
        pitch: Cesium.Math.toRadians(-70.0),
      }
    });
Define points of interest

You need to define the coordinates of interest from Kingston to Frankton in New Zealand's South Island, passing through the Lake Wakatipu. You then draw a polyline connecting these points to visualize the route on the map.

  1. Define a set of points starting from Kingston, passing through Lake Wakatipu, and reaching Frankton.

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    const points = [
      [168.957299, -44.665736],
      [168.970268, -44.655672],
      [168.993555, -44.645187],
      [169.007703, -44.630505],
      [168.999450, -44.609314],
      [169.026863, -44.610783],
      [169.056045, -44.609104]
    ];
Get elevation data

After defining the points and drawing the route, you make a request to the Elevation service to get the elevations of the points along the route.

  1. Define a function called getElevationData() and call it.

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    async function getElevationData() {

    }

  2. Make a request to the Elevation service, passing in the array of points.

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    async function getElevationData() {

      const data = await arcgisRest.findElevationAtManyPoints({
        coordinates: points,
        authentication: arcgisRest.ApiKeyManager.fromKey(accessToken)
      });

    }
Display results

Once the elevation data is fetched, you can display the results on the map. This involves extracting the elevation values from the response and creating a pin and popup at each point to show the elevation information.

  1. Extract the x, y, z values from the service response to be used for displaying the elevation at each point.

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    async function getElevationData() {

      const data = await arcgisRest.findElevationAtManyPoints({
        coordinates: points,
        authentication: arcgisRest.ApiKeyManager.fromKey(accessToken)
      });

      const elevationData = data.result.points;

    }

  2. Use PinBuilder() to place markers on the map at each point, and show a popup with the elevation information when user clicks on it.

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    async function getElevationData() {

      const data = await arcgisRest.findElevationAtManyPoints({
        coordinates: points,
        authentication: arcgisRest.ApiKeyManager.fromKey(accessToken)
      });

      const elevationData = data.result.points;

      const pinBuilder = new Cesium.PinBuilder();
      const pins = [];

      points.forEach((point, index) => {
        const [lng, lat] = point;
        const { x, y, z } = elevationData[index];

        const entity = viewer.entities.add({
            position: Cesium.Cartesian3.fromDegrees(lng, lat, z + 500),
            billboard: {
                verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
                heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
                image: pinBuilder.fromColor(Cesium.Color.BLUE, 48).toDataURL(),
            },
            description: `Longitude: ${x}<br/>Latitude: ${y}<br />Elevation: ${z} m`,
            name: "Elevation relative to mean sea level"
        });
        pins.push(Cesium.Cartesian3.fromDegrees(lng, lat, z + 500));

        viewer.screenSpaceEventHandler.setInputAction(movement => {
          const pickedObject = viewer.scene.pick(movement.position);

          if (Cesium.defined(pickedObject)) {
            viewer.selectedEntity = pickedObject.id;
            viewer.selectedEntity.description = pickedObject.id.description;
          }
        }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
      });

      viewer.entities.add({
        polyline: {
          positions: pins,
          material: Cesium.Color.BLUE
        }
      });

    }
Run the app

Run the app.

You should now see a map centered over the New Zealand's South Island, displaying the path between Kingston to Frankton, passing through the Lake Wakatipu, with elevation values along the route.

What's next?

Learn how to use additional ArcGIS Location Services in these tutorials:

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