Find service areas

Learn how to calculate the area that can be reached in a given drive 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 Service area 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 will create and display five, ten, and fifteen minute drive time service areas when the map is clicked.

To learn how to find a route and directions to different locations, visit the Get a route and directions tutorial.

Prerequisites

Steps

Create a new pen

To get started, either complete the Display a map tutorial or .

Get an access token

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

Go to the Create an API key tutorial and create an API key with the following privilege(s):
- Privileges
  - Location services > Basemaps
  - Location services > Routing

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.

Update the map

A streets basemap layer is typically used in routing applications. Update the basemap attribute to use the arcgis/navigation basemap layer and change the position of the map to center on Osaka.

Update the basemap attribute from arcgis/topographic to arcgis/navigation. Then change the zoom and center attributes to center on Osaka.

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    <arcgis-map basemap="arcgis/navigation" center="135.5023,34.6937" zoom="11">

      <arcgis-zoom slot="top-left"></arcgis-zoom>

    </arcgis-map>
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Add modules and wait for the Map to be ready

Add a <script> tag in the <body> following the <arcgis-map> component. Use $arcgis.import() to add the serviceArea, ServiceAreaParameters, FeatureSet, and Graphic modules.

The ArcGIS Maps SDK for JavaScript is available via CDN and npm, but this tutorial is based on CDN. The $arcgis.import global function accepts a module path or array of module paths, and returns a promise that resolves with the requested modules. This function can only be used when working with the CDN; otherwise, use the standard import syntax. To learn more about the SDK's different modules, visit the References page.

Use the document.querySelector() method to access the map component.

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    <script type="module">

      const [serviceArea, ServiceAreaParams, FeatureSet, Graphic] = await $arcgis.import([
        "@arcgis/core/rest/serviceArea.js",
        "@arcgis/core/rest/support/ServiceAreaParameters.js",
        "@arcgis/core/rest/support/FeatureSet.js",
        "@arcgis/core/Graphic.js",
      ]);

      const viewElement = document.querySelector("arcgis-map");

    </script>
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Wait for the viewOnReady method to resolve to ensure the Map component is loaded and ready to use.

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    <script type="module">

      const [serviceArea, ServiceAreaParams, FeatureSet, Graphic] = await $arcgis.import([
        "@arcgis/core/rest/serviceArea.js",
        "@arcgis/core/rest/support/ServiceAreaParameters.js",
        "@arcgis/core/rest/support/FeatureSet.js",
        "@arcgis/core/Graphic.js",
      ]);

      const viewElement = document.querySelector("arcgis-map");

      await viewElement.viewOnReady();

    </script>
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Define the service url

The serviceArea module makes a request to a service and returns the results. Use the serviceArea class to access the Service area service.

Define a property, serviceAreaUrl, to reference the service url.

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      const serviceAreaUrl =
        "https://route-api.arcgis.com/arcgis/rest/services/World/ServiceAreas/NAServer/ServiceArea_World/solveServiceArea";

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Add a point graphic

Use a point graphic to display the location (facility) for the service area starting point.

Add an arcgisViewClick event handler to add a point graphic to the map.

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      const serviceAreaUrl =
        "https://route-api.arcgis.com/arcgis/rest/services/World/ServiceAreas/NAServer/ServiceArea_World/solveServiceArea";

      viewElement.addEventListener("arcgisViewClick", (event) => {

      });
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Create a createGraphic function that takes a point as a parameter and returns a white Graphic. It should remove all graphics each time.

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      // Create the location graphic
      function createGraphic(point) {
        viewElement.graphics.removeAll();
        const graphic = new Graphic({
          geometry: point,
          symbol: {
            type: "simple-marker",
            color: "white",
            size: 8,
          },
        });

        viewElement.graphics.add(graphic);
        return graphic;
      }
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Update the arcgisViewClick handler to call the createGraphic function and store the graphic in locationGraphic.

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      viewElement.addEventListener("arcgisViewClick", (event) => {

        const locationGraphic = createGraphic(event.detail.mapPoint);

      });
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Click on the map to see a point graphic.

Create service area parameters

A serviceArea uses drive times (cutoffs) and spatial reference parameters to calculate the service area. It also uses a FeatureSet to set the facilities (location) from where the service area polygon will be drawn. Use an arcgisViewClick event handler to set the parameters required to create the service area.

Create a createServiceAreaParams function that takes point graphic, drive time, and spatial reference parameters.

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        viewElement.graphics.add(graphic);
        return graphic;
      }

      function createServiceAreaParams(locationGraphic, driveTimeCutoffs, outSpatialReference) {

      }
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Create a FeatureSet to set the features property with the point graphic.

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      function createServiceAreaParams(locationGraphic, driveTimeCutoffs, outSpatialReference) {

        // Create one or more locations (facilities) to solve for
        const featureSet = new FeatureSet({
          features: [locationGraphic],
        });

      }
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Create a ServiceAreaParams and return the taskParameters element.

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      function createServiceAreaParams(locationGraphic, driveTimeCutoffs, outSpatialReference) {

        // Create one or more locations (facilities) to solve for
        const featureSet = new FeatureSet({
          features: [locationGraphic],
        });

        // Set all of the input parameters for the service
        const taskParameters = new ServiceAreaParams({
          facilities: featureSet,
          defaultBreaks: driveTimeCutoffs,
          trimOuterPolygon: true,
          outSpatialReference: outSpatialReference,
        });
        return taskParameters;

      }
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Update the arcgisViewClick handler to add drive time cutoffs of 5, 10, and 15 minutes and to call the createServiceAreaParams function.

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      viewElement.addEventListener("arcgisViewClick", (event) => {

        const locationGraphic = createGraphic(event.detail.mapPoint);

        const driveTimeCutoffs = [5, 10, 15]; // Minutes
        const serviceAreaParams = createServiceAreaParams(
          locationGraphic,
          driveTimeCutoffs,
          viewElement.spatialReference,
        );

      });
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Solve the service area

To solve the service area, pass the serviceAreaParams to the solve method. Use a solveServiceArea function to find the service area polygon and add the resulting graphic to the map.

Create a solveServiceArea function.

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        // Set all of the input parameters for the service
        const taskParameters = new ServiceAreaParams({
          facilities: featureSet,
          defaultBreaks: driveTimeCutoffs,
          trimOuterPolygon: true,
          outSpatialReference: outSpatialReference,
        });
        return taskParameters;

      }

      function solveServiceArea(url, serviceAreaParams) {

      }
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Call the solve method to find the service area and add the results to the map.

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      function solveServiceArea(url, serviceAreaParams) {

        return serviceArea.solve(url, serviceAreaParams).then(
          (result) => {
            if (result.serviceAreaPolygons.features.length) {
              // Draw each service area polygon
              result.serviceAreaPolygons.features.forEach((graphic) => {
                graphic.symbol = {
                  type: "simple-fill",
                  color: "rgba(255,50,50,.25)",
                };
                viewElement.graphics.add(graphic, 0);
              });
            }
          },
          (error) => {
            console.log(error);
          },
        );

      }
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Update the arcgisViewClick handler to call the solveServiceArea function.

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      viewElement.addEventListener("arcgisViewClick", (event) => {

        const locationGraphic = createGraphic(event.detail.mapPoint);

        const driveTimeCutoffs = [5, 10, 15]; // Minutes
        const serviceAreaParams = createServiceAreaParams(
          locationGraphic,
          driveTimeCutoffs,
          viewElement.spatialReference,
        );

        solveServiceArea(serviceAreaUrl, serviceAreaParams);

      });
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Run the app

In CodePen, run your code to display the map.

Click on the map to create service areas. When you click on the map, you will see a point graphic along with drive time service areas. The service areas represent the area that can be reached within 5, 10, and 15 minutes.

What's next?

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