Get global data

Learn how to query global demographic information with 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.

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.

Prerequisites

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

Use the API key or OAuth developer credentialsDeveloper credentials are a type of item in a portal that contains parameters for authentication. There are two types of developer credentials: API key credentials and OAuth credentials.Learn more so your application can access ArcGIS servicesA service, also known as an ArcGIS service, is software that supports an ArcGIS REST API and provides geospatial functionality or data. A service can be hosted by Esri or in ArcGIS Enterprise.Learn more.

Add references to ArcGIS REST JS

1. Reference the demographics and request modules from ArcGIS REST JS.

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       <!-- Load Leaflet from CDN -->
       <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" crossorigin="">
       <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" crossorigin=""></script>
   
       <!-- Load Esri Leaflet from CDN -->
       <script src="https://unpkg.com/esri-leaflet@3.0.19/dist/esri-leaflet.js"></script>
       <script src="https://unpkg.com/esri-leaflet-vector@4.3.2/dist/esri-leaflet-vector.js"></script>
   
       <!-- Load ArcGIS REST JS libraries from https://unpkg.com -->
       <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

1. Center the map on [18.88, 47.33] and set the zoom level to 5. Change the basemapEnum to arcgis/navigation.

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       const basemapEnum = "arcgis/navigation";
   
       const map = L.map("map", {
         minZoom: 2
       });
   
       map.setView([47.33, 18.88], 5); //Eastern Europe
   
       L.esri.Vector.vectorBasemapLayer(basemapEnum, {
         token: accessToken
       }).addTo(map);
   

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Add a click handler

When you click on the map, your application will display demographic data for the area near the clicked location. Use a click handler to retrieve the coordinates of the click.

1. Create a function called getDemographicData that takes the latlng coordinates as a parameter.

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       L.esri.Vector.vectorBasemapLayer(basemapEnum, {
         token: accessToken
       }).addTo(map);
   
       function getDemographicData(latlng) {
   
       }
   
   

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2. Add a click event handler. Inside, call getDemographicData with the LatLng of the clicked location.

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       L.esri.Vector.vectorBasemapLayer(basemapEnum, {
         token: accessToken
       }).addTo(map);
   
       function getDemographicData(latlng) {
   
       }
   
       map.on("click", (e) => {
         getDemographicData(e.latlng);
       });
   

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Get demographic data

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

1. Create a new ApiKeyManager using your API keyAn API key is a long-lived access token created using API key credentials. They are valid for up to one year and are typically embedded directly into client applications.Learn more.

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       L.esri.Vector.vectorBasemapLayer(basemapEnum, {
         token: accessToken
       }).addTo(map);
   
       const authentication = arcgisRest.ApiKeyManager.fromKey(accessToken);
   
       function getDemographicData(latlng) {
   
       }
   

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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 with an array containing a single geometry object with longitude and latitude. Set the dataCollections parameter to to ["KeyGlobalFacts"] to obtain global data for your location.

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       function getDemographicData(latlng) {
   
         arcgisRest
           .queryDemographicData({
             studyAreas: [{ geometry: { x: latlng.lng, y: latlng.lat } }],
             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 attributes such as population within the study area, the number of males and females, and the average household size.

A message will display if there is no data available for a location selected. To learn more, go to Data enrichment in the Mapping and location services guide.

You can use a Popup to show the results of the query at the location where you clicked on the map.

1. Access the response FeatureSet in a callback function and check to see if it contains data. 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 retrieve demographic information.

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       function getDemographicData(latlng) {
   
         arcgisRest
           .queryDemographicData({
             studyAreas: [{ geometry: { x: latlng.lng, y: latlng.lat } }],
             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}<br>Males: ${attributes.TOTMALES} <br>Females: ${attributes.TOTFEMALES}<br>Average Household Size: ${attributes.AVGHHSZ}`;
             } else {
               message = "Data not available for this location.";
             }
   
           });
   
       }
   

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2. Display a Popup at the clicked location containing the demographic information.

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           .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}<br>Males: ${attributes.TOTMALES} <br>Females: ${attributes.TOTFEMALES}<br>Average Household Size: ${attributes.AVGHHSZ}`;
             } else {
               message = "Data not available for this location.";
             }
   
             L.popup().setLatLng(latlng).setContent(message).openOn(map);
   
           });
   

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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: