Learn how to use data-driven styling to apply symbol colors and styles to feature layers .
A feature layer is a dataset in a feature service hosted in ArcGIS . Each feature layer contains features with a single geometry type (point, line, or polygon), and a set of attributes .
In this tutorial, you apply different styles to enhance the visualization of the Trailheads , Trails , and Parks and Open Spaces feature layers.
Prerequisites You need an ArcGIS Developer or ArcGIS Online account to access the developer dashboard and create an API key .
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 feature-servicerequest
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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-feature-service@4.0.0/dist/bundled/feature-service.umd.js" > </ script >
In the <body>, create an arcgisfeature service .
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const apiKey = "YOUR_API_KEY" ;
Cesium.ArcGisMapService.defaultAccessToken = apiKey;
const authentication = arcgisRest.ApiKeyManager.fromKey(apiKey);
Remove the terrain provider CesiumJS does not currently fully support layer styling in scenes with terrain.
Remove the terrain from your viewer to enable layer ordering and feature outlines.
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const viewer = new Cesium.Viewer( "cesiumContainer" , {
imageryProvider : arcGISImageTileProvider,
terrainProvider : Cesium.createWorldTerrain(),
timeline : false ,
animation : false ,
geocoder : false
});
Style trailheads (points) with icons To style a point feature layer with custom icons, add the layer as a GeoEntityBillboard
Use arcgisTrailheads URL . Format the response as GeoJSON, then add it to your scene as a Geo
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const pointLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0" ;
arcgisRest.queryFeatures({
url : pointLayerURL,
authentication,
f : "geojson"
}).then( ( response ) => {
Cesium.GeoJsonDataSource.load(response,{
clampToGround : true
}).then( ( dataSource ) => {
dataSource.name= "trailheads" ;
viewer.dataSources.add(dataSource);
})
})
After the layer is loaded, iterate through each EntityBillboardhttp:.
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const pointLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0" ;
arcgisRest.queryFeatures({
url : pointLayerURL,
authentication,
f : "geojson"
}).then( ( response ) => {
Cesium.GeoJsonDataSource.load(response,{
clampToGround : true
}).then( ( dataSource ) => {
dataSource.name= "trailheads" ;
viewer.dataSources.add(dataSource);
const entities = dataSource.entities.values;
for ( let i= 0 ; i<entities.length;i++) {
entities[i].billboard.image = "http://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png"
entities[i].billboard.scale= 0.4 ;
}
})
})
Style trails (lines) by elevation gain To visualize the elevation gain of trails in the Trails (lines) feature layer , add the layer as a Geoproperties .
Call the arcgisTrails URL . Format the response as GeoJSON and add it to the scene as a Geo
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const lineLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0" ;
arcgisRest.queryFeatures({
url : lineLayerURL,
authentication,
f : "geojson"
}).then( ( response ) => {
Cesium.GeoJsonDataSource.load(response,{
clampToGround : true
}).then( ( dataSource ) => {
dataSource.name= "trails" ;
viewer.dataSources.add(dataSource);
})
})
Iterate through all entities and set the polylineELEV_ property .
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const lineLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0" ;
arcgisRest.queryFeatures({
url : lineLayerURL,
authentication,
f : "geojson"
}).then( ( response ) => {
Cesium.GeoJsonDataSource.load(response,{
clampToGround : true
}).then( ( dataSource ) => {
dataSource.name= "trails" ;
viewer.dataSources.add(dataSource);
const entities = dataSource.entities.values;
for ( let i= 0 ; i<entities.length;i++) {
const trail = entities[i];
trail.polyline.width = 3 + ( 4 * trail.properties.ELEV_GAIN._value)/ 2300 ;
trail.polyline.material = Cesium.Color.fromCssColorString( '#FCADF9' );
trail.polyline.zIndex = 2 ;
}
})
})
Style parks (polygons) by type You can create a categorical rendering of parks based on their attribute values. Render the polygon features from the Parks and Open Space feature layer with different colors based on the type of land they represent.
Call the arcgisParks and Open Space URL . Format the response as GeoJSON and add it to the scene as a Geo
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const polygonLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0" ;
arcgisRest.queryFeatures({
url : polygonLayerURL,
authentication,
f : "geojson"
}).then( ( response ) => {
Cesium.GeoJsonDataSource.load(response,{
clampToGround : true
}).then( ( dataSource ) => {
dataSource.name= "parks"
viewer.dataSources.add(dataSource);
})
})
The TYPE attribute of the layer contains four different types of parks and open spaces. Define a unique color for each category.
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const polygonLayerURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0" ;
arcgisRest.queryFeatures({
url : polygonLayerURL,
authentication,
f : "geojson"
}).then( ( response ) => {
Cesium.GeoJsonDataSource.load(response,{
clampToGround : true
}).then( ( dataSource ) => {
dataSource.name= "parks"
viewer.dataSources.add(dataSource);
const parkColors = {
"Natural Areas" : "#9E559C" ,
"Regional Open Space" : "#A7C636" ,
"Local Park" : "#149ECE" ,
"Regional Recreation Park" : "#ED5151"
};
})
})
Iterate through all entities and set the polygonTYPE of park.
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Run the app In CodePen , run your code to display the map.
Your map should display the trailheads, trails, and open spaces in the Santa Monica Mountains:
Each trailhead should be represented with a hiker icon. Each trail should have a custom width based on its total elevation gain. Each park should be assigned a color based on its type. What's next? Learn how to use additional ArcGIS location services in these tutorials:
