Tutorial: Get global data

Learn how to query global demographic information for locations around the world.

Query demographic data using API key authentication

The GeoEnrichment service provides global demographic data for 170 countries and regions. To get globally available information, you use the KeyGlobalFacts data collection, which returns information for the total population, total households, average household size, and total population for males and females for a study area.

In this tutorial, you use ArcGIS REST JS to access the GeoEnrichment service and display global data for Eastern Europe.

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:

Option 1: Complete the Display a scene tutorial; or,
Option 2: Start from the Display a scene tutorial .

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.

Go to the Create an API key tutorial and create an API key with the following privilege(s):
- Privileges
  - Location services > Basemaps
  - Location services > Data enrichment
Copy the API key access token to your clipboard when prompted.

Set developer credentials

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

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>
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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>
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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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    const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
      clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
      redirectUri: "YOUR_REDIRECT_URL", // The redirect URL registered in your OAuth credentials
      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_URL", // The redirect URL registered in your OAuth credentials
      portal: "https://www.arcgis.com/sharing/rest" // Your portal URL
    })

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!

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;

Get a Cesium ion access token

All Cesium applications must use an access token provided through Cesium ion. This token allows you to access assets such as Cesium World Terrain in your application.

Go to your Cesium ion dashboard to generate an access token. Copy the key to your clipboard.

Create a cesiumAccessToken variable and replace YOUR_CESIUM_ACCESS_TOKEN with the access token you copied from the Cesium ion dashboard.

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  <script>

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

    // or

    /* Use for user authentication */
    // const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
    //   clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
    //   redirectUri: "YOUR_REDIRECT_URL", // The redirect URL registered in your OAuth credentials
    //   portal: "YOUR_PORTAL_URL" // Your portal URL
    // })

    // const accessToken = session.token;

    Cesium.ArcGisMapService.defaultAccessToken = accessToken;

    const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN";

  </script>

Configure Cesium.Ion.defaultAccessToken with the Cesium access token to validate the application.

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  <script>

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

    // or

    /* Use for user authentication */
    // const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
    //   clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
    //   redirectUri: "YOUR_REDIRECT_URL", // The redirect URL registered in your OAuth credentials
    //   portal: "YOUR_PORTAL_URL" // Your portal URL
    // })

    // const accessToken = session.token;

    Cesium.ArcGisMapService.defaultAccessToken = accessToken;

    const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN";

    Cesium.Ion.defaultAccessToken = cesiumAccessToken;

  </script>

Add references to ArcGIS REST JS

In the <head> element, reference the demographics and request packages from ArcGIS REST JS.

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    <script src="https://cesium.com/downloads/cesiumjs/releases/1.121/Build/Cesium/Cesium.js"></script>
    <link href="https://cesium.com/downloads/cesiumjs/releases/1.121/Build/Cesium/Widgets/widgets.css" rel="stylesheet">

    <script src="https://unpkg.com/@esri/arcgis-rest-request@4/dist/bundled/request.umd.js"></script>
    <script src="https://unpkg.com/@esri/arcgis-rest-demographics@4/dist/bundled/demographics.umd.js"></script>
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Update the map position

Global data is available across many different countries and regions. Update the camera position to center on Europe.

Update the camera destination to [15.347,41.361, 3000000].

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    viewer.camera.setView({

        destination : Cesium.Cartesian3.fromDegrees(15.347,41.361, 3000000),

    });
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Add a click event handler

The study area for your application will be a one-mile buffer around a clicked location. Add an event handler that listens for left clicks on the map and retrieves their coordinates.

Add an event listener to the viewer's ScreenSpaceEventHandler that listens for left clicks.

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        destination : Cesium.Cartesian3.fromDegrees(15.347,41.361, 3000000),

    });

    // Add Esri attribution
    // Learn more in https://esriurl.com/attribution
    const poweredByEsri = new Cesium.Credit("Powered by <a href='https://www.esri.com/en-us/home' target='_blank'>Esri</a>", true)
    viewer.creditDisplay.addStaticCredit(poweredByEsri);

    viewer.screenSpaceEventHandler.setInputAction(function (movement) {

    }, Cesium.ScreenSpaceEventType.LEFT_CLICK)
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Retrieve the coordinates of the left click and convert them to Cartographic latitude and longitude. Pass the coordinates to a new function called getDemographics that accepts coordinates as degrees.

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        destination : Cesium.Cartesian3.fromDegrees(15.347,41.361, 3000000),

    });

    // Add Esri attribution
    // Learn more in https://esriurl.com/attribution
    const poweredByEsri = new Cesium.Credit("Powered by <a href='https://www.esri.com/en-us/home' target='_blank'>Esri</a>", true)
    viewer.creditDisplay.addStaticCredit(poweredByEsri);

    function getDemographics(longitude,latitude) {

    }

    viewer.screenSpaceEventHandler.setInputAction(function (movement) {

        const pickedPosition = viewer.scene.pickPosition(movement.position);
        const cartographic = Cesium.Cartographic.fromCartesian(pickedPosition);

        getDemographics(Cesium.Math.toDegrees(cartographic.longitude),Cesium.Math.toDegrees(cartographic.latitude))

    }, Cesium.ScreenSpaceEventType.LEFT_CLICK)
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Execute the query

Execute the queryDemographicData operation to retrieve local data. To query a circular buffer around a point, pass a geometry object with x and y coordinates. The default search radius is one mile.

Create a new ApiKeyManager using your access token to authenticate requests to the GeoEnrichment service.

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

    // or

    /* Use for user authentication */
    // const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
    //   clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
    //   redirectUri: "YOUR_REDIRECT_URL", // The redirect URL registered in your OAuth credentials
    //   portal: "YOUR_PORTAL_URL" // Your portal URL
    // })

    // const accessToken = session.token;

    Cesium.ArcGisMapService.defaultAccessToken = accessToken;

    const authentication = arcgisRest.ApiKeyManager.fromKey(accessToken);
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Access the GeoEnrichment service with queryDemographicData. Set the studyAreas parameter to a point geometry made from the passed longitude and latitude. Set the dataCollections parameter to to ["KeyGlobalFacts"] to obtain global data for your location.

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    function getDemographics(longitude,latitude) {

        arcgisRest.queryDemographicData({
            studyAreas: [{geometry: {x:longitude, y:latitude}}],
            dataCollections: ["KeyGlobalFacts"],
            authentication:authentication
        })

    }
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Display results

If the query is successful, the response will contain a results array with a value containing a FeatureSet. The FeatureSet contains demographic information about the study area such as population, the number of males and females, and the average household size. A message will display if there is no data available for a selected location.

Access the FeatureSet returned by the service response. If data was returned, access the feature attributes to create a message.

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        arcgisRest.queryDemographicData({
            studyAreas: [{geometry: {x:longitude, y:latitude}}],
            dataCollections: ["KeyGlobalFacts"],
            authentication:authentication
        })

        .then((response) => {
             const featureSet = response.results[0].value.FeatureSet;

             let message;

             if (featureSet.length > 0 && featureSet[0].features.length > 0) {
                 const attributes = featureSet[0].features[0].attributes;
                 message =
                    `<b>Data for a 1 mile search radius</b>` +
                    [
                        `<br>Population: ${attributes.TOTPOP}`,
                        `Males: ${attributes.TOTMALES} `,
                        `Females: ${attributes.TOTFEMALES}`,
                        `Average Household Size: ${attributes.AVGHHSZ}`
                    ].join("<br>");
             }

             else {
                 message = "Data not available for this location.";
             }

         })
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Create a new Entity to display the results. Set the position to the clicked location, and set the description to the message you created.

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             else {
                 message = "Data not available for this location.";
             }

             let resultEntity = new Cesium.Entity({
                 name:"Demographic results",
                 description: message,
                 position:Cesium.Cartesian3.fromDegrees(longitude,latitude)
             });

             viewer.selectedEntity = resultEntity;
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