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<html lang="en">
<title>Merge two polygons together - 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 merge (union) two polygons together to create a single polygon object." />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, Turf.js, geospatial, math, spatial math, polygons, merge, union, spatial analytics" />
<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>
<!-- Load turf.js a spatial math library. -->
<script src='/Common/scripts/turf.min.js'></script>
<script type='text/javascript'>
var map, datasource;
function GetMap() {
//Point the Azure Maps domain to the US Azure Gov Cloud domain.
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-82.55, 35.59],
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 = '';
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 two overlapping polygons. For demo purposes we give them a isUnion property set to false so we can use a single data source for all the data and use filters with layers.
var poly1 = new[[
[-82.574787, 35.594087],
[-82.574787, 35.615581],
[-82.545261, 35.615581],
[-82.545261, 35.594087],
[-82.574787, 35.594087]
]]), {
isUnion: false
var poly2 = new[[
[-82.560024, 35.585153],
[-82.560024, 35.602602],
[-82.52964, 35.602602],
[-82.52964, 35.585153],
[-82.560024, 35.585153]
]]), {
isUnion: false
//Calculate the union of the two polygons and give it a isUion property set to true.
var union = turf.union(poly1, poly2); = {
isUnion: true
//Create a data source and add it to the map.
datasource = new atlas.source.DataSource();
//Add the polygons to the data source.
datasource.add([poly1, poly2, union]);
//Add a polygon layer to render the two input polygons.
new atlas.layer.PolygonLayer(datasource, null, {
fillColor: 'rgba(0,155, 255,0.2)',
filter: ['==', ['get', 'isUnion'], false]
//Add a LineLayer to outline the two polygons in black.
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'black',
filter: ['==', ['get', 'isUnion'], false]
//Add a LineLayer to outline the union of the two polygons in red.
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'red',
strokeWidth: 2,
filter: ['==', ['get', 'isUnion'], true]
<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">Merge two polygons together</h1></legend>
This sample shows how to merge (union) two polygons together to create a single polygon object.
This sample uses the open source <a href="" target="_blank">Turf.js</a> library to for some of the spatial calculation.