Display buildings in 3D | UNL Map JS Docs

Use extrusions to display buildings' height in 3D.

Note

If you want to test this example, edit it in JSFiddle or CodePen and replace the "YOUR-OWN-API-KEY" and "YOUR-OWN-VPM-ID" placeholders with your actual api key and vpm id.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Display buildings in 3D</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/unl-map-js@0.1.5/lib/unl-map-js.js"></script>
<link href="https://unpkg.com/unl-map-js@0.1.5/lib/unl-map-js.css" rel="stylesheet" />
<link
href="https://unpkg.com/maplibre-gl@2.1.9/dist/maplibre-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>
var map = new UnlSdk.Map({
apiKey: "YOUR-OWN-API-KEY",
vpmId: "YOUR-OWN-VPM-ID",
center: [-74.0066, 40.7135],
zoom: 15.5,
pitch: 45,
bearing: -17.6,
container: "map",
antialias: true,
});
 
// The 'building' layer in the streets vector source contains building-height
// data from OpenStreetMap.
map.on("load", function () {
// Insert the layer beneath any symbol layer.
var layers = map.getStyle().layers;
 
var labelLayerId;
for (var i = 0; i < layers.length; i++) {
if (layers[i].type === "symbol" && layers[i].layout["text-field"]) {
labelLayerId = layers[i].id;
break;
}
}
 
map.addLayer(
{
id: "3d-buildings",
source: "omv",
"source-layer": "buildings",
filter: ["==", "extrude", "true"],
type: "fill-extrusion",
minzoom: 15,
paint: {
"fill-extrusion-color": "#aaa",
 
// use an 'interpolate' expression to add a smooth transition effect to the
// buildings as the user zooms in
"fill-extrusion-height": [
"interpolate",
["linear"],
["zoom"],
15,
0,
15.05,
["get", "height"],
],
"fill-extrusion-base": [
"interpolate",
["linear"],
["zoom"],
15,
0,
15.05,
["get", "min_height"],
],
"fill-extrusion-opacity": 0.6,
},
},
labelLayerId
);
});
</script>
 
</body>
</html>