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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%;
}
 
Resources 
1×0.5×0.25× 
Rerun 
              
            
!

JS

              
                //GeoJSON feed that contains the data we want to map.
var geojsonFeed = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/1717245/SamplePoiDataSet.json";

//Colors for each EntityType property in point data: [Gas Station, Grocery Store, Restaurant, School]
var entityTypes = ['Gas Station', 'Grocery Store', 'Restaurant', 'School'];

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

  //Add your Azure Maps subscription key 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 popup;

//Wait until the map resources are ready.
map.events.add('ready', function () {
  //Create a reusable popup.
  popup = new atlas.Popup();

  //Create a data source and add it to the map.
  var datasource = new atlas.source.DataSource(null, {
    cluster: true,

    //The radius in pixels to cluster points together.
    clusterRadius: 50,

    //Calculate counts for each entity type in a cluster as custom aggregate properties.
    clusterProperties: { 
      'Gas Station': ['+', ['case', ['==', ['get', 'EntityType'], 'Gas Station'], 1, 0]],
      'Grocery Store': ['+', ['case', ['==', ['get', 'EntityType'], 'Grocery Store'], 1, 0]],
      'Restaurant': ['+', ['case', ['==', ['get', 'EntityType'], 'Restaurant'], 1, 0]],
      'School': ['+', ['case', ['==', ['get', 'EntityType'], 'School'], 1, 0]]
    }});
  map.sources.add(datasource);

  //Create a bubble layer for rendering clustered data points.
  var clusterBubbleLayer = new atlas.layer.BubbleLayer(datasource, null, {
    radius: 20,
    color: 'purple',
    strokeWidth: 0,
    filter: ['has', 'point_count'] //Only rendered data points which have a point_count property, which clusters do.
  });

  //Add a click event to the layer so a popup can be displayed to show details about the cluster.
  map.events.add('click', clusterBubbleLayer, clusterClicked);

  //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],
        color: 'white'
      }
    }),

    //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.
    })
  ]);

  //Import the GeoJSON data into the data source.
  datasource.importDataFromUrl(geojsonFeed);
});

function clusterClicked(e) {
  if (e && e.shapes && e.shapes.length > 0 && e.shapes[0].properties.cluster) {
    //Get the clustered point from the event.
    var cluster = e.shapes[0];

    var html = ['<div style="padding:10px;">'];

    html.push(`<b>Cluster size: ${cluster.properties.point_count_abbreviated} entities</b><br/><br/>`);

    //Loop though each entity type get the count from the clusterProperties of the cluster.
    entityTypes.forEach(et => {
      html.push(`${et}: ${cluster.properties[et]}<br/>`);
    })

    html.push('</div>');

    //Update the options of the popup and open it on the map.
    popup.setOptions({
      position: cluster.geometry.coordinates,
      content: html.join('')
    });

    popup.open(map);
  }
}
              
            
!
999px

Console