Tutorial: Add features as GeoJSON

Learn how to add features from a feature service to a scene.

Features are a type of geographic data that contain a geometry and attributes. They are typically hosted in an ArcGIS feature service. You can query a feature service to return features formatted as GeoJSON.

This tutorial explains how to get features from a feature service with ArcGIS REST JS, then display them in your CesiumJS application as a GeoJsonDataSource. The tutorial uses three different feature layers, containing points, lines, and polygons.

The three layers you will use are:

• Trailheads (points)
• Trails (lines)
• Parks and Open Spaces (polygons)

Prerequisites

Steps

Get the starter app

Select a type of authentication below and follow the steps to create a new application.

Set up authentication

Create developer credentials in your portal for the type of authentication you selected.

Set developer credentials

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

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_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>
   

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_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

1. In the <head> element, reference the feature-service 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-feature-service@4/dist/bundled/feature-service.umd.js"></script>
   
   

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2. In the <body>, create an arcgisRest.ApiKeyManager using your access token to authenticate requests to the feature 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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Add point features

Point features are typically displayed on top of all other layers. Use arcgisRest.queryFeatures to query the Trailheads feature service and add features to the scene as GeoJSON.

1. Go to the Trailheads URL and browse the properties of the layer. Make note of the layer's Name, Type, and Fields.

2. In CodePen, define a variable to store the URL of the feature service.

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       const pointLayerName = "Trailheads";
       const pointLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+pointLayerName+"/FeatureServer/0";
   

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3. Call the arcgisRest.queryFeatures operation to make an authenticated request to the Trailheads feature service. Set the f property to geojson to format the response as GeoJSON.

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       const pointLayerName = "Trailheads";
       const pointLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+pointLayerName+"/FeatureServer/0";
   
       arcgisRest.queryFeatures({
           url: pointLayerURL,
           authentication,
           f:"geojson"
       }).then((response) => {
   
       });
   

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4. Add the service response service to the scene as a GeoJsonDataSource. Set the clampToGround property to clamp the features to terrain.

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       const pointLayerName = "Trailheads";
       const pointLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+pointLayerName+"/FeatureServer/0";
   
       arcgisRest.queryFeatures({
           url: pointLayerURL,
           authentication,
           f:"geojson"
       }).then((response) => {
   
           const data = Cesium.GeoJsonDataSource.load(response,{
               clampToGround:true,
   
           })
           viewer.dataSources.add(data);
   
       });
   

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5. Add the data attribution for the feature layer source.

   • Go to the Trailheads (Santa Monica Mountains) item.
   • Scroll down to the Credits (Attribution) section and copy its value.
   • Create an attribution property and paste the attribution value from the item.
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         const pointLayerName = "Trailheads";
         const pointLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+pointLayerName+"/FeatureServer/0";
     
         arcgisRest.queryFeatures({
             url: pointLayerURL,
             authentication,
             f:"geojson"
         }).then((response) => {
     
             const data = Cesium.GeoJsonDataSource.load(response,{
                 clampToGround:true,
     
                 // Attribution text retrieved from https://arcgis.com/home/item.html?id=883cedb8c9fe4524b64d47666ed234a7
                 credit: new Cesium.Credit('Los Angeles GeoHub', false)
     
             })
             viewer.dataSources.add(data);
     
         });
     

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Add polyline features

Line features are typically displayed below points. Use arcgisRest.queryFeatures to query the Trails feature service and add features to the scene as GeoJSON.

1. Go to the Trails URL and browse the properties of the layer. Make note of the layer's Name, Type, and Fields.

2. In CodePen, define a variable to store the URL of the feature service.

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       const lineLayerName = "Trails";
       const lineLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+lineLayerName+"/FeatureServer/0";
   

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3. Call the arcgisRest.queryFeatures operation to make an authenticated request to the Trails feature service. Set the f property to geojson to format the response as GeoJSON.

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       const lineLayerName = "Trails";
       const lineLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+lineLayerName+"/FeatureServer/0";
   
       arcgisRest.queryFeatures({
           url: lineLayerURL,
           authentication,
           f:"geojson"
       }).then((response) => {
   
       });
   

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4. Add the service response service to your scene as a GeoJsonDataSource. Set the clampToGround property to clamp the features to terrain.

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       const lineLayerName = "Trails";
       const lineLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+lineLayerName+"/FeatureServer/0";
   
       arcgisRest.queryFeatures({
           url: lineLayerURL,
           authentication,
           f:"geojson"
       }).then((response) => {
   
           const data = Cesium.GeoJsonDataSource.load(response,{
               clampToGround:true,
   
           })
           viewer.dataSources.add(data);
   
       });
   

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5. Add the data attribution for the feature layer source.

   • Go to the Trails item.
   • Scroll down to the Credits (Attribution) section and copy its value.
   • Create an attribution property and paste the attribution value from the item.
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         const lineLayerName = "Trails";
         const lineLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+lineLayerName+"/FeatureServer/0";
     
         arcgisRest.queryFeatures({
             url: lineLayerURL,
             authentication,
             f:"geojson"
         }).then((response) => {
     
             const data = Cesium.GeoJsonDataSource.load(response,{
                 clampToGround:true,
     
                 // Attribution text retrieved from https://arcgis.com/home/item.html?id=69e12682738e467eb509d8b54dc73cbd
                 credit: "Los Angeles GeoHub"
     
             })
             viewer.dataSources.add(data);
     
         });
     

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Add polygon features

Polygon features are typically displayed below lines and points. Use arcgisRest.queryFeatures to query the Parks and Open Spaces feature service and add features to the scene as GeoJSON.

1. Go to the Parks and Open Spaces URL and browse the properties of the layer. Make note of the layer's Name, Type, and Fields.

2. In CodePen, define a variable to store the URL of the feature service.

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       const polygonLayerName = "Parks_and_Open_Space";
       const polygonLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+polygonLayerName+"/FeatureServer/0";
   

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3. Call the arcgisRest.queryFeatures operation to make an authenticated request to the Parks and Open Spaces feature service. Set the f property to geojson to format the response as GeoJSON.

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       const polygonLayerName = "Parks_and_Open_Space";
       const polygonLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+polygonLayerName+"/FeatureServer/0";
   
       arcgisRest.queryFeatures({
           url: polygonLayerURL,
           authentication,
           f:"geojson"
       }).then((response) => {
   
       });
   

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4. Add the service response service to your scene as a GeoJsonDataSource. Set the clampToGround property to clamp the features to terrain.

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       const polygonLayerName = "Parks_and_Open_Space";
       const polygonLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+polygonLayerName+"/FeatureServer/0";
   
       arcgisRest.queryFeatures({
           url: polygonLayerURL,
           authentication,
           f:"geojson"
       }).then((response) => {
   
           const data = Cesium.GeoJsonDataSource.load(response,{
               clampToGround:true,
   
   
           })
           viewer.dataSources.add(data);
   
       });
   

   Expand

5. Add the data attribution for the feature layer source.

   • Go to the Parks and Open Space item.
   • Scroll down to the Credits (Attribution) section and copy its value.
   • Create an attribution property and paste the attribution value from the item.
     Expand

     Use dark colors for code blocks

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         const polygonLayerName = "Parks_and_Open_Space";
         const polygonLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/"+polygonLayerName+"/FeatureServer/0";
     
         arcgisRest.queryFeatures({
             url: polygonLayerURL,
             authentication,
             f:"geojson"
         }).then((response) => {
     
             const data = Cesium.GeoJsonDataSource.load(response,{
                 clampToGround:true,
     
                 // Attribution text retrieved from https://arcgis.com/home/item.html?id=f2ea5d874dad427294641d2d45097c0e
                 credit: "Los Angeles GeoHub"
     
     
             })
             viewer.dataSources.add(data);
     
         });
     

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Run the app

Run the app.

Your map should display the locations of trailheads, trails, and open spaces in the Santa Monica Mountains.

What's next?

Learn how to use additional ArcGIS location services in these tutorials: