リアルタイムデータを追加 | Mapbox GL JS | ドキュメント

リアルタイムGeoJSONデータストリームを使用して、マップ上のシンボルを移動します。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>リアルタイムデータを追加</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.6.1/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.6.1/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',
style: 'mapbox://styles/mapbox/streets-v11',
zoom: 0
});
 
map.on('load', async () => {
// Get the initial location of the International Space Station (ISS).
const geojson = await getLocation();
// Add the ISS location as a source.
map.addSource('iss', {
type: 'geojson',
data: geojson
});
// Add the rocket symbol layer to the map.
map.addLayer({
'id': 'iss',
'type': 'symbol',
'source': 'iss',
'layout': {
// This icon is a part of the Mapbox Streets style.
// To view all images available in a Mapbox style, open
// the style in Mapbox Studio and click the "Images" tab.
// To add a new image to the style at runtime see
// https://docs.mapbox.com/mapbox-gl-js/example/add-image/
'icon-image': 'rocket-15'
}
});
 
// Update the source from the API every 2 seconds.
const updateSource = setInterval(async () => {
const geojson = await getLocation(updateSource);
map.getSource('iss').setData(geojson);
}, 2000);
 
async function getLocation(updateSource) {
// Make a GET request to the API and return the location of the ISS.
try {
const response = await fetch(
'https://api.wheretheiss.at/v1/satellites/25544',
{ method: 'GET' }
);
const { latitude, longitude } = await response.json();
// Fly the map to the location.
map.flyTo({
center: [longitude, latitude],
speed: 0.5
});
// Return the location of the ISS as GeoJSON.
return {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'geometry': {
'type': 'Point',
'coordinates': [longitude, latitude]
}
}
]
};
} catch (err) {
// If the updateSource interval is defined, clear the interval to stop updating the source.
if (updateSource) clearInterval(updateSource);
throw new Error(err);
}
}
});
</script>
 
</body>
</html>