Get demographic data

Learn how to find demographic information for places around the world with GeoEnrichment service.

Prerequisites

Steps

Create a new pen

1. To get started, either complete the Display a map tutorial or use this pen.

Get an access token

You need an access token with the correct privileges to access the location services used in this tutorial.

1. Go to the Create an API key tutorial and create an API key with the following privilege(s):
   
   • Privileges
     • Location services > Basemaps
     • Location services > Geocoding
     • Location services > Data enrichment
2. In CodePen, set esriConfig.apiKey to your access token.
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     var esriConfig = {
       apiKey: "YOUR_ACCESS_TOKEN"
     };
   

To learn about other ways to get an access token, go to Types of authentication.

Import ArcGIS REST JS

Import the ArcGIS REST JS modules to get access to some ArcGIS location services, such as access to global demographic data from the GeoEnrichment service.

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    <!-- 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>

    <!-- Load Calcite components from CDN -->
    <script type="module" src="https://js.arcgis.com/calcite-components/3.0.3/calcite.esm.js"></script>

    <!-- Load the ArcGIS Maps SDK for JavaScript from CDN -->
    <link rel="stylesheet" href="https://js.arcgis.com/4.32/esri/themes/light/main.css" />
    <script src="https://js.arcgis.com/4.32/"></script>

    <!-- Load Map components from CDN -->
    <script
      type="module"
      src="https://js.arcgis.com/map-components/4.32/arcgis-map-components.esm.js"
    ></script>

Update the map

A streets basemap layer is typically used in geocoding applications. Update the map's basemap attribute to use the arcgis/navigation basemap layer and change the position of the map to center on Milan, Italy.

1. Update the basemap property from arcgis/topographic to arcgis/navigation, set the center attribute to 9.1900, 45.4642 and the zoom attribute to 8.

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       <arcgis-map basemap="arcgis/navigation" center="9.1900, 45.4642" zoom="8">
   
         <arcgis-zoom position="top-left"></arcgis-zoom>
   
       </arcgis-map>
   

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Add the Search component

Next, add the Search component so the user can search for locations where they want to see the demographics.

1. Create the Search component inside the arcgis-map element. Set attributes to modify the placeholder text, disable the default popup, and place the search widget in the top-right corner of the map.

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       <arcgis-map basemap="arcgis/navigation" center="9.1900, 45.4642" zoom="8">
   
         <arcgis-zoom position="top-left"></arcgis-zoom>
   
         <arcgis-search all-placeholder="Get demographic data" popup-disabled position="top-right"></arcgis-search>
   
       </arcgis-map>
   

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Add script and modules

1. In a new <script> at the bottom of the <body>, use a require statement to add the geodesicBufferOperator, Graphic, locator, and SimpleFillSymbol modules.

   More info

   The ArcGIS Maps SDK for JavaScript is available as AMD modules and ES modules, but this tutorial is based on AMD. The AMD require function uses references to determine which modules will be loaded – for example, you can specify "esri/layers/FeatureLayer" for loading the FeatureLayer module. After the modules are loaded, they are passed as parameters (e.g. FeatureLayer) to the callback function where they can be used in your application. It is important to keep the module references and callback parameters in the same order. To learn more about the API's different modules visit the Overview Guide page.

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     <body>
   
       <arcgis-map basemap="arcgis/navigation" center="9.1900, 45.4642" zoom="8">
   
         <arcgis-zoom position="top-left"></arcgis-zoom>
   
         <arcgis-search all-placeholder="Get demographic data" popup-disabled position="top-right"></arcgis-search>
   
       </arcgis-map>
   
       <script>
         require([
           "esri/geometry/operators/geodesicBufferOperator",
           "esri/Graphic",
           "esri/rest/locator",
           "esri/symbols/SimpleFillSymbol"
         ], (geodesicBufferOperator, Graphic, locator, SimpleFillSymbol) => {
   
         });
       </script>
   
     </body>
   

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2. Use your API key to create a new authentication constant for ArcGIS REST JS in the require statement.

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       <script>
         require([
           "esri/geometry/operators/geodesicBufferOperator",
           "esri/Graphic",
           "esri/rest/locator",
           "esri/symbols/SimpleFillSymbol"
         ], (geodesicBufferOperator, Graphic, locator, SimpleFillSymbol) => {
   
           const authentication = arcgisRest.ApiKeyManager.fromKey(esriConfig.apiKey);
   
         });
       </script>
   

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3. When the user selects a search result, query for the demographics of that location. To do this, listen for the arcgisSelectResult event on the Search component, then call a getDemographicData() function, which we will further define in the Get demographic data section.

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       <script>
         require([
           "esri/geometry/operators/geodesicBufferOperator",
           "esri/Graphic",
           "esri/rest/locator",
           "esri/symbols/SimpleFillSymbol"
         ], (geodesicBufferOperator, Graphic, locator, SimpleFillSymbol) => {
   
           const authentication = arcgisRest.ApiKeyManager.fromKey(esriConfig.apiKey);
   
           const arcgisSearch = document.querySelector("arcgis-search");
   
           arcgisSearch.addEventListener("arcgisSelectResult", async (event) => {
             if (!event.detail.result) {
               return;
             }
             getDemographicData(event.detail.result.name, event.detail.result.feature.geometry);
           });
   
           async function getDemographicData(city, point) {
   
           }
   
         });
       </script>
   

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Add click event on the map

We also want users to search for demographics by clicking anywhere on the map. To do this, add an event listener for the arcgisViewClick event on the Map.

1. Add an event listener for the arcgisViewClick event to watch for when users click on the map.

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           const arcgisMap = document.querySelector("arcgis-map");
   
           arcgisMap.addEventListener("arcgisViewClick", async (event) => {
   
           });
   
   

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2. When the event is returned, use the resulting mapPoint to set your parameters, then execute the locationToAddress() method on the locator with the specified parameters. This will return the address for which we want to find the demographics.

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           arcgisMap.addEventListener("arcgisViewClick", async (event) => {
   
             const params = {
               location: event.detail.mapPoint,
               outFields: "*"
             };
   
             const locatorUrl = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer";
   
             const address = await locator.locationToAddress(locatorUrl, params);
   
           });
   

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3. Once the locationToAddress() method has resolved, use the results to get the city's name closest to the click point. Use the city and the point clicked on the map to call the getDemographicData() method defined in the next step. If an error is encountered, remove all graphics from the map and log the error.

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           arcgisMap.addEventListener("arcgisViewClick", async (event) => {
   
             const params = {
               location: event.detail.mapPoint,
               outFields: "*"
             };
   
             const locatorUrl = "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer";
   
             const address = await locator.locationToAddress(locatorUrl, params);
   
             try {
               const city = address.attributes.City || address.attributes.Region;
               getDemographicData(city, params.location);
             } catch (error) {
               arcgisMap.graphics.removeAll();
               console.log(error);
             }
   
           });
   

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Get demographic data

To get the demographic data for an area on the map, we will use the ArcGIS REST JS queryDemographicData() method.

1. Query for the demographic data using the queryDemographicData() method from ArcGIS REST JS. Set the studyAreas to the longitude and latitude of our point parameter. Use the authentication variable set from our API key earlier to authenticate this request. The queryDemographicData() method will return a promise with the response, so await the result in an asynchronous function.

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           async function getDemographicData(city, point) {
   
             const demographicData = await arcgisRest.queryDemographicData({
               studyAreas: [
                 {
                   geometry: {
                     x: point.longitude,
                     y: point.latitude
                   }
                 }
               ],
               authentication: authentication
             });
   
           }
   

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2. Check that results were returned and add them to an attributes variable. Then, call the showData() function to show the results in a popup.

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           async function getDemographicData(city, point) {
   
             const demographicData = await arcgisRest.queryDemographicData({
               studyAreas: [
                 {
                   geometry: {
                     x: point.longitude,
                     y: point.latitude
                   }
                 }
               ],
               authentication: authentication
             });
   
             if (!demographicData.results || demographicData.results.length === 0) {
               return;
             }
   
             if (
               demographicData.results[0].value.FeatureSet.length > 0 &&
               demographicData.results[0].value.FeatureSet[0].features.length > 0
             ) {
               const attributes = demographicData.results[0].value.FeatureSet[0].features[0].attributes;
               showData(city, attributes, point);
             }
   
           }
   

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Display data in a Popup

Once we have the results from the demographic query, show those results in a popup to display to the user.

1. Create the showData function mentioned in the last step. If the function parameters are not valid, return. Otherwise, display a new popup and buffer graphic.

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           async function showData(city, attributes, point) {
             if (!city || !attributes || !point) {
               return;
             }
   
           }
   

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2. Set the dockOptions and visibleElements on the map's default Popup to hide the collapse and dock buttons.

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           async function showData(city, attributes, point) {
             if (!city || !attributes || !point) {
               return;
             }
   
             arcgisMap.popup.dockOptions = {
               buttonEnabled: false
             };
             arcgisMap.popup.visibleElements = {
               collapseButton: false
             };
   
           }
   

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3. Define the title and content of the Popup. In the title, enter the name of the city. In the content, display the demographics for that city.

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           async function showData(city, attributes, point) {
             if (!city || !attributes || !point) {
               return;
             }
   
             arcgisMap.popup.dockOptions = {
               buttonEnabled: false
             };
             arcgisMap.popup.visibleElements = {
               collapseButton: false
             };
   
             const title = `Global facts near ${city}`;
             const content = `Population: ${attributes.TOTPOP}<br>Males: ${attributes.TOTMALES} <br>Females: ${attributes.TOTFEMALES}<br>Average Household Size: ${attributes.AVGHHSZ}`;
   
           }
   

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4. Open the popup with the title and content displayed at the given point.

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           async function showData(city, attributes, point) {
             if (!city || !attributes || !point) {
               return;
             }
   
             arcgisMap.popup.dockOptions = {
               buttonEnabled: false
             };
             arcgisMap.popup.visibleElements = {
               collapseButton: false
             };
   
             const title = `Global facts near ${city}`;
             const content = `Population: ${attributes.TOTPOP}<br>Males: ${attributes.TOTMALES} <br>Females: ${attributes.TOTFEMALES}<br>Average Household Size: ${attributes.AVGHHSZ}`;
   
             arcgisMap.openPopup({
               location: point,
               title: title,
               content: content
             });
   
           }
   

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5. Next, display a buffer around the map point where we get the demographics so the user knows what is included in the query. Create a one-mile buffer graphic using the geodesicBufferOperator and add it to the map.

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             await geodesicBufferOperator.load();
   
             const buffer = geodesicBufferOperator.execute(point, 1, {
               unit: "miles"
             });
   
             const bufferGraphic = new Graphic({
               geometry: buffer,
               symbol: new SimpleFillSymbol({
                 color: [50, 50, 50, 0.1],
                 outline: {
                   color: [0, 0, 0, 0.25],
                   width: 0.5
                 }
               })
             });
   
             arcgisMap.graphics.removeAll();
             arcgisMap.graphics.add(bufferGraphic);
   

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Show the Popup on app load

To give users an idea of how the app works, show the popup on the app's initial load. Once the map component is ready, call getDemographicData() for the center of the view.

1. Outside of the showData() function and beneath the arcgisViewClick event listener, check if the map component is ready and call the getDemographicData() function. If the map is not ready, add an event listener for the arcgisViewReadyChange event to call the getDemographicData() function after the map is ready.

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           if (!arcgisMap.ready) {
             arcgisMap.addEventListener(
               "arcgisViewReadyChange",
               () => {
                 getDemographicData("Milan", arcgisMap.center);
               },
               {
                 once: true
               }
             );
           } else {
             getDemographicData("Milan", arcgisMap.center);
           }
   

   Expand

Run the App

In CodePen, run your code to display the map.

Click on the map or perform a search to get the demographics for a given city.

What's next?

Learn how to use additional API features and ArcGIS services in these tutorials:

• Find places
• Search for an address
• Reverse geocode