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Consistent zoomable Heat Map.html
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Consistent zoomable Heat Map.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Consistent zoomable Heat Map - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<link rel="shortcut icon" href="/favicon.ico"/>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to create a heat map where the radius of each data point covers the same physical area on the ground and creates a more consistent user experience when zooming the map." />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, heatmap, heat map, heatmaps, heat maps, density, layer, thermatic" />
<meta name="author" content="Microsoft Azure Maps" /><meta name="version" content="1.0" />
<meta name="screenshot" content="screenshot.gif" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.min.css" rel="stylesheet" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.min.js"></script>
<script>
var map, datasource;
function getMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-73.963, 40.741],
zoom: 12,
view: 'Auto',
//Add authentication details for connecting to Azure Maps.
authOptions: {
//Use Microsoft Entra ID authentication.
authType: 'anonymous',
clientId: 'e6b6ab59-eb5d-4d25-aa57-581135b927f0', //Your Azure Maps client id for accessing your Azure Maps account.
getToken: function (resolve, reject, map) {
//URL to your authentication service that retrieves an Microsoft Entra ID Token.
var tokenServiceUrl = 'https://samples.azuremaps.com/api/GetAzureMapsToken';
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);
//Load a data set of points, in this case some sample point of interest data.
datasource.importDataFromUrl('/data/geojson/SamplePoiDataSet.json');
//Create a heatmap and add it to the map.
map.layers.add(new atlas.layer.HeatMapLayer(datasource, null, {
radius: [
'interpolate',
['exponential', 2],
['zoom'],
//For all zoom levels 10 or lower, set the radius to 2 pixels.
10, 2,
//Between zoom level 10 and 22, exponentially scale the radius from 2 pixels to 50000 pixels.
22, 50000
]
}), 'labels');
});
}
</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>Consistent zoomable Heat Map</legend>
This sample shows how to create a heat map where the radius of each data point covers the same
physical area on the ground and creates a more consistent user experience when zooming the map.
In this sample, the heat map will scale consistently between zoom levels 10 and 22.
Each zoom level of the map has twice as many pixels vertically and horizontally as the previous zoom level,
as such, scaling the radius such that it doubles with each zoom level will create a heat map that looks consistent on
all zoom levels. This can be accomplished by using the zoom with a base 2 exponential interpolation expression as shown below.
</fieldset>
</body>
</html>