Learn how to query global demographic information for locations around the world with the GeoEnrichment service .
The GeoEnrichment service provides global demographic data for 170 countries and regions. To get globally available information, you use the Key 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 Create a new pen To get started, either complete the Display a scene tutorial or use this pen . Set the API key To access location services , you need an API key or OAuth 2.0 access token . To learn how to create and scope your key, visit the Create an API key tutorial.
Go to your dashboard to get an API key. The API key must be scoped to access the services used in this tutorial.
In CodePen , update api to use your key. Update cesium to use your Cesium ion access token .
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const apiKey = "YOUR_API_KEY" ;
Cesium.ArcGisMapService.defaultAccessToken = apiKey;
const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN" ;
Cesium.Ion.defaultAccessToken = cesiumAccessToken;
const arcGisImagery = Cesium.ArcGisMapServerImageryProvider.fromBasemapType(Cesium.ArcGisBaseMapType.SATELLITE);
const viewer = new Cesium.Viewer( "cesiumContainer" , {
baseLayer : Cesium.ImageryLayer.fromProviderAsync(arcGisImagery),
});
Add references to ArcGIS REST JS In the <head> element, reference the demographicsrequest
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< script src = "https://cesium.com/downloads/cesiumjs/releases/1.105/Build/Cesium/Cesium.js" > </ script >
< link href = "https://cesium.com/downloads/cesiumjs/releases/1.105/Build/Cesium/Widgets/widgets.css" rel = "stylesheet" >
< script src = "https://unpkg.com/@esri/arcgis-rest-request@4.0.0/dist/bundled/request.umd.js" > </ script >
< script src = "https://unpkg.com/@esri/arcgis-rest-demographics@4.0.0/dist/bundled/demographics.umd.js" > </ script >
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 ),
});
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 Screen
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destination : Cesium.Cartesian3.fromDegrees( 15.347 , 41.361 , 3000000 ),
});
viewer.screenSpaceEventHandler.setInputAction( function ( movement ) {
}, Cesium.ScreenSpaceEventType.LEFT_CLICK)
Retrieve the coordinates of the left click and convert them to Cartographicget that accepts coordinates as degrees.
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destination : Cesium.Cartesian3.fromDegrees( 15.347 , 41.361 , 3000000 ),
});
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)
Execute the query Execute the querygeometry object with x and y coordinates. The default search radius is one mile.
Create a new Api using your API key to authenticate requests to the GeoEnrichment service.
In order to access ArcGIS location services with ArcGIS REST JS , you need an access token , either an API key or a token created by OAuth 2.0 authentication. API keys have scopes, so make sure to scope your API key with permissions to access the service.
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const apiKey = "YOUR_API_KEY" ;
Cesium.ArcGisMapService.defaultAccessToken = apiKey;
const authentication = arcgisRest.ApiKeyManager.fromKey(apiKey);
Access the GeoEnrichment service with querystudypoint geometry made from the passed longitude and latitude. Set the data parameter to to ["Key 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
})
}
Display results If the query is successful, the response will contain a results array with a value containing a Feature. The Feature 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 Feature 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." ;
}
})
Create a new Entityposition 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;
Run the app In CodePen , run your code to display the map.
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 ArcGIS location services in these tutorials:
