Show line data from GeoJSON on the map

This step-by-step tutorial provides a detailed guide on how to incorporate a GeoJSON line overlay onto a map. The following steps will walk you through the process.

1. Copy the following code, paste it into your favorite text editor, and save it as a .html file.

2. Install the npm package.

3. Include the CSS file.

   If you have a bundler that can handle CSS, you can import the CSS or include it with a <link> in the head of the document via the CDN

4. Include the following code in your JavaScript file (Example: app.js).

5. Replace YOUR_MAPTILER_API_KEY_HERE with your actual MapTiler API key.

6. The next is up to you. You can center your map wherever you desire (modifying the starting position) and set an appropriate zoom level (modifying the starting zoom) to match your users’ needs. Additionally, you can change the map’s look (by updating the source URL); choose from a range of visually appealing map styles from our extensive MapTiler standard maps, or create your own to truly differentiate your application.

7. Add event handler for map load event. You will add code to create a GeoJSON source and a vector layer in this handler.

   
      map.on('load', async function() {
         
      });
    

8. Create GeoJSON source. The following snippet creates GeoJSON source hosted on MapTiler Cloud (check out the How to Upload GeoJSON to MapTiler Cloud tutorial). Publish the dataset and copy the link to the GeoJSON. Download the Amphitheater Lake trail sample data.

   
        map.on('load', async function() {
            const geojson = await maptilersdk.data.get('YOUR_MAPTILER_DATASET_ID_HERE');
            map.addSource('gps_tracks', {
                'type': 'geojson',
                'data': geojson
            });
        });
    

9. Add the vector layer

   
        map.addLayer({
            'id': 'grand_teton',
            'type': 'line',
            'source': 'gps_tracks',
            'layout': {},
            'paint': {
                'line-color': '#e11',
                'line-width': 4
            }
        });
    

Learn more

Check out the tutorials on How to add a GeoJSON in MapLibre (video & code) to learn how to load a point GeoJSON and change the point icon.

Related examples

Create a gradient line using an expression

Example

Use the line-gradient paint property and an expression to visualize distance from the starting point of a line.

Line layer (polyline helper)

Example

This example shows how to add a line layer to the map using the polyline layer helper.

GeoJSON multiGeometry layer

Example

This tutorial shows how to add a GeoJSON MultiGeometry overlay to the map.

Add GeoJSON to AR maps

Example

Add a GeoJSON line to Augmented reality (AR) map, to create a biking or hiking route 3D model. Compatible with WebXR or Apple Quick Look.