Tutorial: Get global data

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

The ArcGIS GeoEnrichment serviceA GeoEnrichment service is a service that aggregates demographic data and local facts for locations around the world. It is used to provide insight about the people and places near a location. It is hosted by Esri as the ArcGIS GeoEnrichment service and can also be hosted in ArcGIS Enterprise.Learn more provides global demographic data for 170 countries and regions. To get globally available information, you use the KeyGlobalFacts data collectionA data collection is pre-defined and categorized list of analysis variables (data field names) that are used by the GeoEnrichment service.Learn more, 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, 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 and follow the steps to create a new app.

Set up authentication

Set developer credentials

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.

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

2. 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_URI", // 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>
   

3. 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_URI", // 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

1. 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/1.140/Build/Cesium/Cesium.js"></script>
       <link href="https://cesium.com/downloads/cesiumjs/releases/1.140/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.

1. 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 areaA GeoEnrichment study area is a location used for spatial analysis in the GeoEnrichment service.Learn more 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.

1. 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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2. 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.

1. 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_URI", // 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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2. Access the GeoEnrichment serviceA GeoEnrichment service is a service that aggregates demographic data and local facts for locations around the world. It is used to provide insight about the people and places near a location. It is hosted by Esri as the ArcGIS GeoEnrichment service and can also be hosted in ArcGIS Enterprise.Learn more with queryDemographicData. Set the studyAreas parameter to a pointA point is a type of geometry containing a single set of x,y coordinates and a spatial reference.Learn more 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.

1. Access the FeatureSet returned by the service response. If data was returned, access the feature attributesAttributes are fields and values for a single feature or non-spatial record. They are typically stored in a database or service such as a feature service.Learn more 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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2. 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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Run the app

Run the app.

You should now see a map centered over eastern Europe. Click on the map to query for demographic data and view the results in a popup

What's next?

Learn how to use additional location services in these tutorials: