Find service areas

Learn how to calculate the area that can be reached in a given driving time from a location.

A service area, also known as an isochrone, is a polygon that represents the area that can be reached when driving or walking on a street network. The area that can be reached is restricted by either time or distance. To calculate service areas, you can use the routing service. You provide a start location (facilities), one or more time or distance values, and a spatial reference. Once processed, the service returns the service areas that can be reached.

In this tutorial, you create and display five, ten, and fifteen minute drive time service areas when the map is clicked. You use data-driven styling to give each polygon a different shade of blue.

Prerequisites

Steps

Create a new pen

1. To get started, either complete the Display a map 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.

1. Go to your dashboard to get an API key. The API key must be scoped to access the services used in this tutorial.

2. In CodePen, update apiKey to use your key.

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         const map = L.map("map", {
           minZoom: 2
         })
   
         map.setView([34.02, -118.805], 13);
   
         const apiKey = "YOUR_API_KEY";
   
         const basemapEnum = "arcgis/streets";
   
         L.esri.Vector.vectorBasemapLayer(basemapEnum, {
           apiKey: apiKey
         }).addTo(map);
   

Add references to ArcGIS REST JS

1. Reference the routing and request packages 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@3.0.12/dist/esri-leaflet.js"></script>
       <script src="https://unpkg.com/esri-leaflet-vector@4.2.3/dist/esri-leaflet-vector.js"></script>
   
       <!-- Load ArcGIS REST JS from CDN -->
       <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-routing@4.0.0/dist/bundled/routing.umd.js"></script>
   

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Update the map

A navigation basemap layer is typically used in geocoding and routing applications. Update the basemap layer to use arcgis/navigation.

1. Update the basemap and the map initialization to center on location [100.5231,13.7367], Bangkok.

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         const apiKey = "YOUR_API_KEY";
   
         const basemapEnum = "arcgis/streets";
   
         const map = L.map("map", {
           minZoom: 2
         });
   
         map.setView([13.7367, 100.5231], 13); // Bangkok
   
         L.esri.Vector.vectorBasemapLayer(basemapEnum, {
           apiKey: apiKey
         }).addTo(map);
   

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Add layer groups

In this app, you display a marker for the starting point location and polygons for the service areas. Add a LayerGroup to display the point and polygons on the map.

1. Add a LayerGroup for the clickedPoint and another for the serviceAreas.

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         L.esri.Vector.vectorBasemapLayer(basemapEnum, {
           apiKey: apiKey
         }).addTo(map);
   
         const clickedPoints = L.layerGroup().addTo(map);
         const serviceAreas = L.layerGroup().addTo(map);
   

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Add a click handler

When you click on the map, you will update the location of the clickedPoint and return a new service area.

1. Add a click event handler. Inside, remove the data from the previous click with clearLayers.

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         const clickedPoints = L.layerGroup().addTo(map);
         const serviceAreas = L.layerGroup().addTo(map);
   
         map.on("click", (e) => {
           clickedPoints.clearLayers();
           serviceAreas.clearLayers();
   
         });
   

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2. Display a Marker at the clicked location.

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         map.on("click", (e) => {
           clickedPoints.clearLayers();
           serviceAreas.clearLayers();
   
           L.marker(e.latlng).addTo(clickedPoints);
   
         });
   

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Get the service area

With the longitude and latitude of the click event, you can call the serviceArea function from ArcGIS REST JS to get the service area.

1. Create a new ApiKeyManager to access the route service.

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         const clickedPoints = L.layerGroup().addTo(map);
         const serviceAreas = L.layerGroup().addTo(map);
   
         const authentication = arcgisRest.ApiKeyManager.fromKey(apiKey);
   
         map.on("click", (e) => {
           clickedPoints.clearLayers();
           serviceAreas.clearLayers();
   
           L.marker(e.latlng).addTo(clickedPoints);
   
         });
   

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2. Call the serviceArea operation. Set the facilities parameter with the clicked coordinates to calculate the service area.

   More info

   The facilities parameter lets you pass in multiple locations around which the service area is calculated. In this case, you are only passing one.

   By default, the three drive times that are requested are 5, 10 and 15 minutes. You can change these by passing the defaultBreaks parameter.

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         const authentication = arcgisRest.ApiKeyManager.fromKey(apiKey);
   
         map.on("click", (e) => {
           clickedPoints.clearLayers();
           serviceAreas.clearLayers();
   
           L.marker(e.latlng).addTo(clickedPoints);
   
           arcgisRest
             .serviceArea({
               endpoint: "https://route-api.arcgis.com/arcgis/rest/services/World/ServiceAreas/NAServer/ServiceArea_World/solveServiceArea",
               authentication,
               facilities: [[e.latlng.lng, e.latlng.lat]]
             })
   
         });
   

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3. Add an error handler. Inside, show a message and write the error to the console.

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           arcgisRest
             .serviceArea({
               endpoint: "https://route-api.arcgis.com/arcgis/rest/services/World/ServiceAreas/NAServer/ServiceArea_World/solveServiceArea",
               authentication,
               facilities: [[e.latlng.lng, e.latlng.lat]]
             })
   
             .catch((error) => {
               console.error(error);
               alert("There was a problem using the route service. See the console for details.");
             });
   

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Display the service area on the map

The response to the request contains the geographic information of the service areas that you can access and display on the map.

1. Add a response handler. Inside, add a GeoJSON layer that adds the features to the serviceAreas layer.

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           arcgisRest
             .serviceArea({
               endpoint: "https://route-api.arcgis.com/arcgis/rest/services/World/ServiceAreas/NAServer/ServiceArea_World/solveServiceArea",
               authentication,
               facilities: [[e.latlng.lng, e.latlng.lat]]
             })
   
             .then((response) => {
               L.geoJSON(response.saPolygons.geoJson, {
   
               }
               ).addTo(serviceAreas);
             })
   
             .catch((error) => {
               console.error(error);
               alert("There was a problem using the route service. See the console for details.");
             });
   

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2. Style the different polygons using the FromBreak property to distinguish the 5, 10, and 15 minute drive time polygons.

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             .then((response) => {
               L.geoJSON(response.saPolygons.geoJson, {
   
                 style: (feature) => {
                   const style = {
                     fillOpacity: 0.5,
                     weight: 1
                   };
                   if (feature.properties.FromBreak === 0) {
                     style.color = "hsl(210, 80%, 40%)";
                   } else if (feature.properties.FromBreak === 5) {
                     style.color = "hsl(210, 80%, 60%)";
                   } else {
                     style.color = "hsl(210, 80%, 80%)";
                   }
                   return style;
                 }
   
               }
               ).addTo(serviceAreas);
             })
   

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Run the app

In CodePen, run your code to display the map.

When you click on the map, three service areas are shown as concentric polygons around a marker. These indicate the areas that can be reached by driving for 5, 10 or 15 minutes.

What's next?

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