Add Contour Lines
Contour lines show elevation intervals as lines on the map, making it easy to read the shape of the terrain at a glance. In Maptoolkit Maps JS, you generate contours by adding a raster-dem source and connecting it to a contour source type, then styling the result as a line layer. Use contour lines in hiking, cycling, or outdoor activity apps where understanding slope and elevation change is important.
const API_KEY = 'YOUR_API_KEY';
const map = new maptoolkit.Map({
container: 'map',
apiKey: API_KEY,
style: `https://styles.maptoolkit.net/maptoolkit/maptoolkit.summer.json?api_key=${API_KEY}`,
center: [11.39085, 47.27574],
zoom: 10,
attributionControl: { compact: false }
});
map.addControl(new maptoolkit.NavigationControl(), 'top-right');
map.on('load', () => {
map.addSource('terrain-dem', {
type: 'raster-dem',
tiles: [`https://vtc-cdn.maptoolkit.net/terrain/{z}/{x}/{y}.webp?api_key=${API_KEY}`],
tileSize: 256,
minzoom: 5,
maxzoom: 12,
encoding: 'terrarium'
});
const beforeId = (map.getStyle().layers.find((l) => /^road|^building/.test(l.id)) || {}).id;
map.addLayer({
id: 'contours',
type: 'hillshade',
source: 'terrain-dem',
paint: {
'hillshade-exaggeration': 0.3,
'hillshade-shadow-color': '#3d2b1f',
'hillshade-highlight-color': '#fff'
}
}, beforeId);
});<!DOCTYPE html>
<html lang="en">
<head>
<title>Add Contour Lines - Maptoolkit Maps JS</title>
<meta property="og:description" content="Display elevation contour lines using a raster-dem source." />
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://unpkg.com/@maptoolkit/[email protected]/dist/maptoolkit.js"></script>
<link rel="stylesheet" href="https://unpkg.com/@maptoolkit/[email protected]/dist/maptoolkit.css" />
<style>
html, body { width: 100%; height: 100%; margin: 0; padding: 0; }
#map { width: 100%; height: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
const API_KEY = 'YOUR_API_KEY';
const map = new maptoolkit.Map({
container: 'map',
apiKey: API_KEY,
style: `https://styles.maptoolkit.net/maptoolkit/maptoolkit.summer.json?api_key=${API_KEY}`,
center: [11.39085, 47.27574],
zoom: 10,
attributionControl: { compact: false }
});
map.addControl(new maptoolkit.NavigationControl(), 'top-right');
map.on('load', () => {
map.addSource('terrain-dem', {
type: 'raster-dem',
tiles: [`https://vtc-cdn.maptoolkit.net/terrain/{z}/{x}/{y}.webp?api_key=${API_KEY}`],
tileSize: 256,
minzoom: 5,
maxzoom: 12,
encoding: 'terrarium'
});
const beforeId = (map.getStyle().layers.find((l) => /^road|^building/.test(l.id)) || {}).id;
map.addLayer({
id: 'contours',
type: 'hillshade',
source: 'terrain-dem',
paint: {
'hillshade-exaggeration': 0.3,
'hillshade-shadow-color': '#3d2b1f',
'hillshade-highlight-color': '#fff'
}
}, beforeId);
});
</script>
</body>
</html>Use the prompt below with any LLM to get the same result. Make sure the Maptoolkit MCP server is connected first — check out AI Integration & MCP to get started.
Use the Maptoolkit Connector. Create an interactive map with zoom level 10, centered around [11.39085, 47.27574], displaying elevation contour lines.