Display buildings in 3D
Use extrusions to display buildings' height in 3D
<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title></title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.32.1/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.32.1/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({
    style: 'mapbox://styles/mapbox/light-v9',
    center: [-74.0066, 40.7135],
    zoom: 15,
    pitch: 45,
    bearing: -17.6,
    container: 'map'
});

// the 'building' layer in the mapbox-streets vector source contains building-height
// data from OpenStreetMap.
map.on('load', function() {
    map.addLayer({
        'id': '3d-buildings',
        'source': 'composite',
        'source-layer': 'building',
        'filter': ['==', 'extrude', 'true'],
        'type': 'fill-extrusion',
        'minzoom': 15,
        'paint': {
            'fill-extrusion-color': '#aaa',
            'fill-extrusion-height': {
                'type': 'identity',
                'property': 'height'
            },
            'fill-extrusion-base': {
                'type': 'identity',
                'property': 'min_height'
            },
            'fill-extrusion-opacity': .6
        }
    });
});
</script>

</body>
</html>
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