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<!DOCTYPE html>
<html lang="en">
<title>Vector tile heat map - 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 how to use a vector tile service to render data as a heat map." />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, heatmap, heat map, heatmaps, heat maps, density, layer, thermatic, vector tiles, mbtiles, traffic, layer, flow, incidents" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="" type="text/css" />
<script src=""></script>
<script type='text/javascript'>
var map, datasource, popup;
function GetMap() {
//Point the Azure Maps domain to the US Azure Gov Cloud domain.
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-78, 40],
style: 'grayscale_dark',
zoom: 5,
view: 'Auto',
//Add your Azure Maps subscription client ID to the map SDK. Get an Azure Maps client ID at
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 = '';
fetch(tokenServiceUrl).then(r => r.text()).then(token => resolve(token));
//Alternatively, use an Azure Maps key. Get an Azure Maps key at NOTE: The primary key should be used as the key.
//authType: 'subscriptionKey',
//subscriptionKey: '<Your Azure Maps Key>'
//Wait until the map resources are ready.'ready', function () {
//Create a reusable popup.
popup = new atlas.Popup();
//Create a vector tile source and add it to the map.
datasource = new atlas.source.VectorTileSource(null, {
tiles: ['https://{azMapsDomain}/traffic/flow/tile/pbf?api-version=1.0&style=relative&zoom={z}&x={x}&y={y}'],
maxZoom: 22
//Create a layer for traffic flow lines.
var flowLayer = new atlas.layer.HeatMapLayer(datasource, null, {
//The name of the data layer within the data source to pass into this rendering layer.
sourceLayer: 'Traffic flow',
//Give each data point a weight based on the level of traffic.
//Since traffic flow level goes from 0 - closed, to 1 - free flow, lets intverse this value so slower areas have more weight.
weight: ['-', 1, ['get', 'traffic_level']],
//Give each data point a radius.
radius: 5,
//Ignore roads where traffic is travelling at 80% of the posted speed limit or higher.
filter: ['<', ['get', 'traffic_level'], 0.80]
//Add the traffic flow layer below the labels to make the map clearer.
map.layers.add(flowLayer, 'labels');
//Add a click event to the layer to display details about the traffic flow line.'click', flowLayer, featureClicked);
function featureClicked(e) {
//Make sure the event occurred on a shape feature.
if (e.shapes && e.shapes.length > 0) {
//Since the data is coming from a vector tile source, it will be a raw GeoJSON feature and not a Shape class.
//Update the content and position of the popup.
//Apply a template to the properties of the shape feature.
content: atlas.PopupTemplate.applyTemplate(e.shapes[0].properties),
position: e.position
//Open the popup.;
<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">Vector tile heat map</h1></legend>
This sample shows how to how to use a vector tile service to render data as a heat map.
In this case traffic flow data is used. The points that make up the flow lines are used as the heat points. Points that have a traffic flow greater than 80% of the posted speed limit are ignored. The traffic level is used to weight each data point in the heat map.
<br /><br />
This sample uses the <a href="">Azure Maps vector tile traffic flow service</a>.
Detailed information about the format of the traffic flow vector tiles can be found
<a href="">here</a>.