Show point data from GeoJSON on the map

This tutorial offers a comprehensive walkthrough on integrating a GeoJSON point overlay onto a map. You will be guided through the following steps to achieve this.

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. To follow this tutorial you can use Airports from Natural Earth. Download the Airports sample data

8. 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', function() {
         
      });
    

9. Add a custom image to the map. You can use any image or download the airport image we used in the tutorial. In the example the image is in the same folder as the index.html file

   
     map.on('load', function() {
       map.loadImage('./icon-plane-512.png', async function(error, image){
         if (error) throw error;
         map.addImage('plane', image);
   
       });
     });
   

10. 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 sample data here.

    
         const geojson = await maptilersdk.data.get('YOUR_MAPTILER_DATASET_ID_HERE');
         map.addSource('airports', {
           type: 'geojson',
           data: geojson
         });
     

11. Add the vector layer

    
       map.addLayer({
         'id': 'airports',
         'type': 'symbol',
         'source': 'airports',
         'layout': {
           'icon-image': 'plane',
           'icon-size': ['*', ['get', 'scalerank'], 0.01]
         },
         'paint': {}
       });
     

Learn more

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

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