Extrude polygons for 3D indoor mapping | Mapbox GL JS

This example demonstrates how to create a 3D indoor map.

It uses the get expression to set a fill-extrusion layer's fill-extrusion-height, fill-extrusion-base, and fill-extrusion-color paint properties using values from the GeoJSON source.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Extrude polygons for 3D indoor mapping</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.8.2/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.8.2/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [-87.61694, 41.86625],
zoom: 15.99,
pitch: 40,
bearing: 20,
antialias: true
});
 
map.on('load', () => {
map.addSource('floorplan', {
'type': 'geojson',
/*
* Each feature in this GeoJSON file contains values for
* `properties.height`, `properties.base_height`,
* and `properties.color`.
* In `addLayer` you will use expressions to set the new
* layer's paint properties based on these values.
*/
'data': 'https://docs.mapbox.com/mapbox-gl-js/assets/indoor-3d-map.geojson'
});
map.addLayer({
'id': 'room-extrusion',
'type': 'fill-extrusion',
'source': 'floorplan',
'paint': {
// Get the `fill-extrusion-color` from the source `color` property.
'fill-extrusion-color': ['get', 'color'],
 
// Get `fill-extrusion-height` from the source `height` property.
'fill-extrusion-height': ['get', 'height'],
 
// Get `fill-extrusion-base` from the source `base_height` property.
'fill-extrusion-base': ['get', 'base_height'],
 
// Make extrusions slightly opaque to see through indoor walls.
'fill-extrusion-opacity': 0.5
}
});
});
</script>
 
</body>
</html>