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Layers (31)
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Visualize population density

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

Mapbox GL unsupported
Mapbox GL requires WebGL support. Please check that you are using a supported browser and that WebGL is enabled.
<!DOCTYPE html>
<html>
<head>
<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/v1.0.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.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>
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 () {
map.addLayer({
'id': 'rwanda-provinces',
'type': 'fill',
'source': {
'type': 'geojson',
'data': 'https://docs.mapbox.com/mapbox-gl-js/assets/rwanda-provinces.geojson'
},
'layout': {},
'paint': {
'fill-color':
["let", "density", ["/", ["get", "population"], ["get", "sq-km"]],
[
"interpolate",
["linear"],
["zoom"],
8,
[
"interpolate",
["linear"],
["var", "density"],
274,
["to-color", "#edf8e9"],
1551,
["to-color", "#006d2c"]
],
10,
[
"interpolate",
["linear"],
["var", "density"],
274,
["to-color", "#eff3ff"],
1551,
["to-color", "#08519c"]
]
]
],
'fill-opacity': .7
}
});
});
</script>
</body>
</html>