Show Polygon Data from GeoJSON on the Map

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

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

  2. Replace YOUR_MAPTILER_API_KEY_HERE with your actual MapTiler API key.

  3. The next it’s up to you. You can start the map in a different place by modifying the starting position and starting zoom, and you can change the look of the map to any of our styles, or yours, by updating the style URL. See what’s available here.

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

    
           zoom: 5, // starting zoom
         });
         map.on('load', function() {
            
         });
         map.on('error', function(err) {
     
  5. Create GeoJSON source. The following snippet creates GeoJSON source with one feature (without attributes) and polygon geometry.

    
         map.on('load', function() {
             map.addSource('maine', {
                 'type': 'geojson',
                 'data': {
                     'type': 'Feature',
                     'geometry': {
                         'type': 'Polygon',
                         'coordinates': [
                             [
                                 [-67.13734351262877, 45.137451890638886],
                                 [-66.96466, 44.8097],
                                 [-68.03252, 44.3252],
                                 [-69.06, 43.98],
                                 [-70.11617, 43.68405],
                                 [-70.64573401557249, 43.090083319667144],
                                 [-70.75102474636725, 43.08003225358635],
                                 [-70.79761105007827, 43.21973948828747],
                                 [-70.98176001655037, 43.36789581966826],
                                 [-70.94416541205806, 43.46633942318431],
                                 [-71.08482, 45.3052400000002],
                                 [-70.6600225491012, 45.46022288673396],
                                 [-70.30495378282376, 45.914794623389355],
                                 [-70.00014034695016, 46.69317088478567],
                                 [-69.23708614772835, 47.44777598732787],
                                 [-68.90478084987546, 47.184794623394396],
                                 [-68.23430497910454, 47.35462921812177],
                                 [-67.79035274928509, 47.066248887716995],
                                 [-67.79141211614706, 45.702585354182816],
                                 [-67.13734351262877, 45.137451890638886]
                             ]
                         ]
                     }
                 }
             });
         });
     
  6. Add the vector layer

    
         });
         map.addLayer({
             'id': 'maine',
             'type': 'fill',
             'source': 'maine',
             'layout': {},
             'paint': {
                 'fill-color': '#088',
                 'fill-opacity': 0.8
             }
         });
     });