Load data from an external GeoJSON file | Mapbox GL JS

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.

JavaScript

React

JavaScript

React


<!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>

このコードスニペットは、YOUR_MAPBOX_ACCESS_TOKENをあなたのMapboxアカウントのアクセストークンに置き換えるまで、期待通りに動作しません。

JavaScript

React


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;

このコードスニペットは、YOUR_MAPBOX_ACCESS_TOKENをあなたのMapboxアカウントのアクセストークンに置き換えるまで、期待通りに動作しません。

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