# 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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### 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};

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}};