Heatmap layer radius and weight by property (heatmap helper)

This example shows how to add a heatmap layer to the map, simultaneously controlling the radius and weight based on a property using the heatmap layer helper. Download the sample data here.

Since zoomCompensation is disabled in this example, it is recommended to view the map specifically on z12.


npm install --save @maptiler/sdk

main.js

import { Map, MapStyle, config, ColorRampCollection, helpers } from '@maptiler/sdk';
import '@maptiler/sdk/dist/maptiler-sdk.css';

config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
const map = new Map({
    container: 'map',
    zoom: 12,
    center: [-77.01162, 38.94189],
    style: MapStyle.DATAVIZ.DARK
});

map.on('load', async function () {
  await helpers.addHeatmap(map, {
    data: 'schools.geojson',
    property: "students",
    radius: [
      {propertyValue: 100, value: 15},
      {propertyValue: 800, value: 50},
    ],
    weight: [
      {propertyValue: 100, value: 0.1},
      {propertyValue: 800, value: 1},
    ],
    colorRamp: ColorRampCollection.MAGMA,
    zoomCompensation: false,
    opacity: 0.7,
    intensity: 1.2,
  });
});

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="robots" content="noindex">
  <title>Heatmap layer radius and weight by property (heatmap helper) | NPM example</title>
  <link rel="stylesheet" href="./style.css">
</head>
<body>
  <div id="map"></div>
  <script type="module" src="./main.js"></script>
</body>
</html>

style.css

body {margin: 0; padding: 0;}
#map {position: absolute; top: 0; bottom: 0; width: 100%;}

<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Heatmap helper</title>
<script src="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.umd.min.js"></script>
<link href="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.css" rel="stylesheet" />
<style>
  body {margin: 0; padding: 0;}
  #map {position: absolute; top: 0; bottom: 0; width: 100%;}
</style>
</head>
<body>
<div id="map"></div>

<script>
    maptilersdk.config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
    const map = new maptilersdk.Map({
        container: 'map',
        zoom: 12,
        center: [-77.01162, 38.94189],
        style: maptilersdk.MapStyle.DATAVIZ.DARK
    });

    map.on('load', async function () {
      await maptilersdk.helpers.addHeatmap(map, {
        data: 'schools.geojson',
        property: "students",
        radius: [
          {propertyValue: 100, value: 15},
          {propertyValue: 800, value: 50},
        ],
        weight: [
          {propertyValue: 100, value: 0.1},
          {propertyValue: 800, value: 1},
        ],
        colorRamp: maptilersdk.ColorRampCollection.MAGMA,
        zoomCompensation: false,
        opacity: 0.7,
        intensity: 1.2,
      });
    });

</script>
</body>
</html>