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 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 You need a free ArcGIS developer account to access your dashboard and API keys . The API key must be scoped to access the services used in this tutorial.
Steps Create a new pen To get started, either complete the Display a map tutorial or use this pen . Set the API key To access ArcGIS services , you need an API key .
Go to your dashboard to get an API key .
In CodePen , set the api to your key, so it can be used to access basemap layer and location services.
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esriConfig.apiKey = "YOUR_API_KEY" ;
const map = new Map ({
basemap : "arcgis-topographic" // Basemap layer service
});
Add modules In the require statement, add the serviceServiceFeatureGraphic
More info The ArcGIS API for JavaScript is available as AMD modules and ES modules , but this tutorial is based on AMD. The AMD require function uses references to determine which modules will be loaded – for example, you can specify "esri/Map" for loading the Map module. After the modules are loaded, they are passed as parameters (e.g. Map) to the callback function where they can be used in your application. It is important to keep the module references and callback parameters in the same order. For more information on the different types of modules, visit the Introduction to Tooling guide topic.
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require([
"esri/config",
"esri/Map",
"esri/views/MapView",
"esri/rest/serviceArea",
"esri/rest/support/ServiceAreaParameters",
"esri/rest/support/FeatureSet",
"esri/Graphic"
], function(esriConfig, Map, MapView, serviceArea, ServiceAreaParams, FeatureSet, Graphic) {
Update the map A streets basemap layer is typically used in routing applications. Update the basemaparcgis-navigation basemap layer and change the position of the map to center on Osaka.
Update the basemaparcgis-topographic to arcgis-navigation.
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esriConfig.apiKey = "YOUR_API_KEY" ;
const map = new Map ({
basemap : "arcgis-navigation"
});
Change the zoomcenter
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esriConfig.apiKey = "YOUR_API_KEY" ;
const map = new Map ({
basemap : "arcgis-navigation"
});
const view = new MapView({
container : "viewDiv" ,
map : map,
center : [ 135.5023 , 34.6937 ], //Longitude, latitude
zoom : 11
});
Define the service url The service module makes a request to a service and returns the results. Use the serviceService area service .
Define a property, service, to reference the service url.
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const view = new MapView({
container : "viewDiv" ,
map : map,
center : [ 135.5023 , 34.6937 ], //Longitude, latitude
zoom : 11
});
const serviceAreaUrl = "https://route-api.arcgis.com/arcgis/rest/services/World/ServiceAreas/NAServer/ServiceArea_World/solveServiceArea" ;
Add a point graphic Use a point graphic to display the location (facility) for the service area starting point.
Add a click handler to add a point graphic to the view
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const serviceAreaUrl = "https://route-api.arcgis.com/arcgis/rest/services/World/ServiceAreas/NAServer/ServiceArea_World/solveServiceArea" ;
view.on( "click" , function ( event ) {
});
Create a create function that takes a point as a parameter and returns a white Graphic
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// Create the location graphic
function createGraphic ( point ) {
view.graphics.removeAll();
const graphic = new Graphic({
geometry : point,
symbol : {
type : "simple-marker" ,
color : "white" ,
size : 8
}
});
view.graphics.add(graphic);
return graphic;
}
Update the click handler to call the create function and store the graphic in location.
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view.on( "click" , function ( event ) {
const locationGraphic = createGraphic(event.mapPoint);
});
Click on the map to see a point graphic .
Create service area parameters A serviceservice area . It also uses a Featurefacilitiespolygon will be drawn. Use a click handler in the View
Create a create function that takes point graphic , drive time, and spatial reference parameters.
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view.graphics.add(graphic);
return graphic;
}
function createServiceAreaParams ( locationGraphic, driveTimeCutoffs, outSpatialReference ) {
}
Create a Featurefeaturespoint 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]
});
}
Create a Servicetask 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;
}
Update the click handler to add drive time cutoffs of 5, 10, and 15 minutes and to call the create function.
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view.on( "click" , function ( event ) {
const locationGraphic = createGraphic(event.mapPoint);
const driveTimeCutoffs = [ 5 , 10 , 15 ]; // Minutes
const serviceAreaParams = createServiceAreaParams(locationGraphic, driveTimeCutoffs, view.spatialReference);
});
Solve the service area To solve the service area, pass the service to the solve method. Use a solve function to find the service area polygon and add the resulting graphic to the view
Create a solve 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 ) {
}
Call the solve method to find the service area and add the results to the view
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function solveServiceArea ( url, serviceAreaParams ) {
return serviceArea.solve(url, serviceAreaParams)
.then( function ( result ) {
if (result.serviceAreaPolygons.length) {
// Draw each service area polygon
result.serviceAreaPolygons.forEach( function ( graphic ) {
graphic.symbol = {
type : "simple-fill" ,
color : "rgba(255,50,50,.25)"
}
view.graphics.add(graphic, 0 );
});
}
}, function ( error ) {
console .log(error);
});
}
Update the click handler to call the solve function.
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view.on( "click" , function ( event ) {
const locationGraphic = createGraphic(event.mapPoint);
const driveTimeCutoffs = [ 5 , 10 , 15 ]; // Minutes
const serviceAreaParams = createServiceAreaParams(locationGraphic, driveTimeCutoffs, view.spatialReference);
solveServiceArea(serviceAreaUrl, serviceAreaParams);
});
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 API features and
ArcGIS services in these tutorials: