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<!DOCTYPE html>
<html lang="en">
<head>
<title>Calculate a Simple Isochrone - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<link rel="shortcut icon" href="/favicon.ico"/>
<meta http-equiv="x-ua-compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to calculate an isochrone (drive time polygon) using the Azure Maps Route Reachable Range service and display it on the map. " />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, REST, service, directions, route, routing, isochrone, isodistance, drive time polygon, reachable range, temporal, temporal analysis" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
<script type='text/javascript'>
var map, datasource;
var reachableRangeUrlTemplate = 'https://{azMapsDomain}/route/range/json?api-version=1.0&query={lat},{lon}&timeBudgetInSec={time}&view=Auto';
function GetMap() {
//Point the Azure Maps domain to the US Azure Gov Cloud domain.
atlas.setDomain('atlas.azure.us');
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-0.113042, 51.511859],
zoom: 12,
view: 'Auto',
//Add authentication details for connecting to Azure Maps.
authOptions: {
//Use Azure Active Directory authentication.
authType: 'anonymous',
clientId: 'c9f2f391-13f1-407b-a4a5-f0a241bacfbf', //Your Azure Active Directory client id for accessing your Azure Maps account.
getToken: function (resolve, reject, map) {
//URL to your authentication service that retrieves an Azure Active Directory Token.
var tokenServiceUrl = 'https://azuremapscodesamples.azurewebsites.us/Common/TokenService.ashx';
fetch(tokenServiceUrl).then(r => r.text()).then(token => resolve(token));
}
//Alternatively, use an Azure Maps key. Get an Azure Maps key at https://azure.com/maps. NOTE: The primary key should be used as the key.
//authType: 'subscriptionKey',
//subscriptionKey: '<Your Azure Maps Key>'
}
});
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Create a data source and add it to the map.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Add layers to the map to render the data.
map.layers.add([
//Createa polygon layer to render the isochrone.
new atlas.layer.PolygonLayer(datasource, null, {
fillColor: 'rgba(255,0,0,0.4)'
}),
//Create a symbol layer to render the center point.
new atlas.layer.SymbolLayer(datasource, null, {
filter: ['any', ['==', ['geometry-type'], 'Point'], ['==', ['geometry-type'], 'MultiPoint']] //Only render Point or MultiPoints in this layer.
})
]);
//Calculate a 15 minute isochrone from the center of the map. Note that we have to convert 15 minutes to seconds.
getIsochrone(map.getCamera().center, 15 * 60);
});
}
function getIsochrone(center, timeInSeconds) {
//Create the URL request to the reachable range service.
var request = reachableRangeUrlTemplate
.replace('{lat}', center[1])
.replace('{lon}', center[0])
.replace('{time}', timeInSeconds);
processRequest(request).then(response => {
if (response.error) {
alert(response.error.message);
return;
}
if (response.reachableRange) {
//Convert the response into GeoJSON and add it to the map.
var positions = response.reachableRange.boundary.map(function (latLng) {
return [latLng.longitude, latLng.latitude];
});
var isochrone = new atlas.data.Polygon([positions]);
var centerPoint = new atlas.data.Point([
response.reachableRange.center.longitude,
response.reachableRange.center.latitude
]);
//Add the data to the data source.
datasource.add([
isochrone,
centerPoint
]);
} else {
alert('Unable to calculate an isochrone.')
}
});
}
function processRequest(url) {
//This is a reusable function that sets the Azure Maps platform domain, sings the request, and makes use of any transformRequest set on the map.
return new Promise((resolve, reject) => {
//Replace the domain placeholder to ensure the same Azure Maps cloud is used throughout the app.
url = url.replace('{azMapsDomain}', atlas.getDomain());
//Get the authentication details from the map for use in the request.
var requestParams = map.authentication.signRequest({ url: url });
//Transform the request.
var transform = map.getServiceOptions().tranformRequest;
if (transform) {
requestParams = transform(url);
}
fetch(requestParams.url, {
method: 'GET',
mode: 'cors',
headers: new Headers(requestParams.headers)
})
.then(r => r.json(), e => reject(e))
.then(r => {
resolve(r);
}, e => reject(e));
});
}
</script>
</head>
<body onload="GetMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend><h1 style="font-size:16px">Calculate a Simple Isochrone</h1></legend>
This sample shows how to calculate a simple isochrone (drive time polygon) using the Azure Maps
<a href="https://docs.microsoft.com/en-us/azure/azure-maps/glossary#reachable-range" target="_blank">Route Reachable Range service</a> and display it on the map.
This sample calculates an isochrone for driving 15 minutes from a point near the center of London, UK.
</fieldset>
</body>
</html>