Esri Leaflet
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Styling heatmaps

Custom styling of heatmap gradients with the L.heat options. More information about Feature Layers can be found in the L.esri.FeatureLayer documentation.

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>Styling heatmaps</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />

  <!-- Load Leaflet from CDN -->
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css"
    integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A=="
    crossorigin=""/>
  <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"
    integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet from CDN -->
  <script src="https://unpkg.com/esri-leaflet@3.0.8/dist/esri-leaflet.js"
    integrity="sha512-E0DKVahIg0p1UHR2Kf9NX7x7TUewJb30mxkxEm2qOYTVJObgsAGpEol9F6iK6oefCbkJiA4/i6fnTHzM6H1kEA=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet Vector from CDN -->
  <script src="https://unpkg.com/esri-leaflet-vector@3.1.3/dist/esri-leaflet-vector.js"
    integrity="sha512-2sbebld2cAnzUw4nloopGcKE7AGl7xUlCXg8amUWS47veGTKMH6tx1VsT7U9ukwXPAVzecigXK0jMtS5UcllDg=="
    crossorigin=""></script>

  <style>
    body { margin:0; padding:0; }
    #map { position: absolute; top:0; bottom:0; right:0; left:0; }
  </style>
</head>
<body>

<!-- Include Leaflet.heat from CDN -->
<script src="https://unpkg.com/leaflet.heat@0.2.0/dist/leaflet-heat.js"></script>

<!-- Load Heatmap Feature Layer from CDN -->
<script src="https://unpkg.com/esri-leaflet-heatmap@2.0.1"></script>

<div id="map"></div>

<script>
  var map = L.map('map', {
    maxZoom: 16 // the heatmap plugin needs some help understanding the map's maxZoom
  }).setView([41.759, -88.157], 12);

  L.esri.Vector.vectorBasemapLayer('ArcGIS:LightGray', {
    apikey: apiKey // Replace with your API key - https://developers.arcgis.com
  }).addTo(map);

  // new constructor syntax at 2.0.0
  L.esri.Heat.featureLayer({
    url: 'https://sampleserver6.arcgisonline.com/arcgis/rest/services/CommunityAddressing/MapServer/0',
    radius: 10,
    gradient: {
      0.2: '#ffffb2',
      0.4: '#fd8d3c',
      0.6: '#fd8d3c',
      0.8: '#f03b20',
      1: '#bd0026'
    }
  }).addTo(map);
</script>

</body>
</html>