Load data from an external GeoJSON file
This example adds GeoJSON data from an external file and uses it in a layer on the map.
Upon loading the map, it uses addSource to add the GeoJSONSource to the map, using a URL string as the value for data. Then it uses addLayer to create a circle layer that references the source.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Load data from an external GeoJSON file</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.8.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.8.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map', // container ID
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio
style: 'mapbox://styles/mapbox/satellite-v9', // style URL
projection: 'globe', // Display the map as a globe, since satellite-v9 defaults to Mercator
zoom: 2, // starting zoom
center: [108, 4] // // starting center in [lng, lat]
});
map.on('style.load', () => {
map.setFog({}); // Set the default atmosphere style
});
map.on('load', () => {
map.addSource('earthquakes', {
type: 'geojson',
// Use a URL for the value for the `data` property.
data: 'https://docs.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson'
});
map.addLayer({
'id': 'earthquakes-layer',
'type': 'circle',
'source': 'earthquakes',
'paint': {
'circle-radius': 4,
'circle-stroke-width': 2,
'circle-color': 'red',
'circle-stroke-color': 'white'
}
});
});
</script>
</body>
</html>
This code snippet will not work as expected until you replace
YOUR_MAPBOX_ACCESS_TOKEN with an access token from your Mapbox account.import React, { useEffect, useRef } from 'react';
import mapboxgl from 'mapbox-gl';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
useEffect(() => {
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
mapRef.current = new mapboxgl.Map({
container: mapContainerRef.current,
style: 'mapbox://styles/mapbox/satellite-v9',
projection: 'globe',
zoom: 2,
center: [108, 4]
});
mapRef.current.on('style.load', () => {
mapRef.current.setFog({});
});
mapRef.current.on('load', () => {
mapRef.current.addSource('earthquakes', {
type: 'geojson',
data: 'https://docs.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson'
});
mapRef.current.addLayer({
id: 'earthquakes-layer',
type: 'circle',
source: 'earthquakes',
paint: {
'circle-radius': 4,
'circle-stroke-width': 2,
'circle-color': 'red',
'circle-stroke-color': 'white'
}
});
});
return () => mapRef.current.remove();
}, []);
return <div ref={mapContainerRef} id="map" style={{ height: '100%' }}></div>;
};
export default MapboxExample;
This code snippet will not work as expected until you replace
YOUR_MAPBOX_ACCESS_TOKEN with an access token from your Mapbox account.Was this example helpful?