Mapbox Density Heatmap in JavaScript

How to make a D3.js-based density mapbox in JavaScript. A density mapbox uses a variable binding expression to display population density.

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Plotly is a free and open-source graphing library for JavaScript. We recommend you read our Getting Started guide for the latest installation or upgrade instructions, then move on to our Plotly Fundamentals tutorials or dive straight in to some Basic Charts tutorials.

Stamen Terrain Tile that Needs no Token

To plot on Mapbox maps with Plotly you may need a Mapbox account and a public Mapbox Access Token. See our Mapbox Map Layers documentation for more information.

var data = [{type: 'densitymapbox', lon: [10, 20, 30], lat: [15, 25, 35], z: [1, 3, 2]}];

var layout = {width: 600, height: 400, mapbox: {style: 'stamen-terrain'}};

Plotly.newPlot('myDiv', data, layout);

Light Tile, Requires Token

var data = [
  {type: "densitymapbox", lon: [10, 20, 30], lat: [15, 25, 35], z: [1, 3, 2],
   radius: 50, colorbar: {y: 1, yanchor: 'top', len: 0.45}},
  {type: 'densitymapbox', lon: [-10, -20, -30], lat: [15, 25, 35],
   radius: [50, 100, 10],  colorbar: {y: 0, yanchor: 'bottom', len: 0.45}
  }];

var layout = {mapbox: {style: 'light', center: {lat: 20}}, width: 600, height: 400};

var config = {mapboxAccessToken: "your access token"};

Plotly.newPlot('myDiv', data, layout, config);

Outdoors Tile that Requires Token

d3.csv('https://raw.githubusercontent.com/plotly/datasets/master/earthquakes-23k.csv',
  function(err, rows){function unpack(rows, key) {return rows.map(function(row){ return row[key];
})};

var data = [{
  lon: unpack(rows, 'Longitude'), lat: unpack(rows, 'Latitude'), radius:10,
  z: unpack(rows, 'Magnitude'), type: "densitymapbox", coloraxis: 'coloraxis',
  hoverinfo: 'skip'}];

var layout = {
    mapbox: {center: {lon: 60, lat: 30}, style: "outdoors", zoom: 2},
    coloraxis: {colorscale: "Viridis"}, title: {text: "Earthquake Magnitude"},
    width: 600, height: 400, margin: {t: 30, b: 0}};

var config = {mapboxAccessToken: "your access token"};

Plotly.newPlot('myDiv', data, layout, config);
})