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HTML

              
                <html>
<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>

<body>
  <div id="map"></div>
</body>
</html>
              
            
!

CSS

              
                html,
body {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
}

#map {
  width: 100%;
  height: 100%;
}
              
            
!

JS

              
                //GeoJSON feed of all earthquakes from the past 30 days. Sourced from the USGS.
var earthquakeFeed = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.geojson";

//Initialize a map instance.
var map = new atlas.Map('map', {
  center: [-97, 39],
  zoom: 2,
  view: "Auto",
  style: 'night', 

  //Add your Azure Maps subscription client ID to the map SDK.
  authOptions: {
    authType: "anonymous",
    clientId: "04ec075f-3827-4aed-9975-d56301a2d663", //Your Azure Maps account Client ID is required to access 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.net/Common/TokenService.ashx";

      fetch(tokenServiceUrl).then(r => r.text()).then(token => resolve(token));
    }
  }
}); 

var datasource;

//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(null, {
    //Tell the data source to cluster point data.
    cluster: true,

    //The radius in pixels to cluster points together.
    clusterRadius: 45,

    //The maximium zoom level in which clustering occurs.
    //If you zoom in more than this, all points are rendered as symbols.
    clusterMaxZoom: 15 
  });
  map.sources.add(datasource);

  //Create a bubble layer for rendering clustered data points.
  var clusterBubbleLayer = new atlas.layer.BubbleLayer(datasource, null, {
    //Scale the size of the clustered bubble based on the number of points inthe cluster.
    radius: [
      'step',
      ['get', 'point_count'],
      20,         //Default of 20 pixel radius.
      100, 30,    //If point_count >= 100, radius is 30 pixels.
      750, 40     //If point_count >= 750, radius is 40 pixels.
    ],

    //Change the color of the cluster based on the value on the point_cluster property of the cluster.
    color: [
      'step',
      ['get', 'point_count'],
      'lime',            //Default to lime green. 
      100, 'yellow',     //If the point_count >= 100, color is yellow.
      750, 'red'        //If the point_count >= 100, color is red.
    ],
    strokeWidth: 0,
    filter: ['has', 'point_count'] //Only rendered data points which have a point_count property, which clusters do.
  });

  //Add the clusterBubbleLayer and two additional layers to the map.
  map.layers.add([
    clusterBubbleLayer,

    //Create a symbol layer to render the count of locations in a cluster.
    new atlas.layer.SymbolLayer(datasource, null, {
      iconOptions: {
        image: 'none' //Hide the icon image.
      },
      textOptions: {
        textField: ['get', 'point_count_abbreviated'],
        offset: [0, 0.4]
      }
    }),

    //Create a layer to render the individual locations.
    new atlas.layer.SymbolLayer(datasource, null, {
      filter: ['!', ['has', 'point_count']] //Filter out clustered points from this layer.
    })
  ]);

  //Retrieve a GeoJSON data set and add it to the data source. 
  datasource.importDataFromUrl(earthquakeFeed);
});
              
            
!
999px

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