Layers (31)
Display buildings in 3DExtrude polygons for 3D indoor mappingAdd a 3D modelAdjust a layer's opacityAnimate a lineAnimate a series of imagesAnimate a pointChange building color based on zoom levelChange the case of labelsDisplay HTML clusters with custom propertiesCreate and style clustersChange a layer's color with buttonsAdd a custom style layerStyle circles with a data-driven propertyStyle lines with a data-driven propertyDisplay and style rich text labelsAdd a pattern to a polygonAdd a new layer below labelsAdd a GeoJSON lineDraw GeoJSON pointsAdd a GeoJSON polygonCreate a heatmap layerCreate a gradient line using an expressionAdd multiple geometries from one GeoJSON sourceStyle ocean depth dataShow and hide layersChange worldview of administrative boundariesUpdate a choropleth layer by zoom levelVariable label placementVisualize population densityAdd hillshading

Visualize population density

Using a variable binding expression to calculate and display population density.

<!DOCTYPE html>
<meta charset='utf-8' />
<title>Visualize population density</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v1.4.1/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.4.1/mapbox-gl.css' rel='stylesheet' />
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
<div id='map'></div>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map', // container id
style: 'mapbox://styles/mapbox/streets-v11', // stylesheet location
center: [30.0222, -1.9596], // starting position [lng, lat]
zoom: 7 // starting zoom
map.on('load', function () {
'id': 'rwanda-provinces',
'type': 'fill',
'source': {
'type': 'geojson',
'data': 'https://docs.mapbox.com/mapbox-gl-js/assets/rwanda-provinces.geojson'
'layout': {},
'paint': {
["let", "density", ["/", ["get", "population"], ["get", "sq-km"]],
["var", "density"],
["to-color", "#edf8e9"],
["to-color", "#006d2c"]
["var", "density"],
["to-color", "#eff3ff"],
["to-color", "#08519c"]
'fill-opacity': .7
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