クリックしたポイント周囲のフィーチャを選択

マップをクリックして、queryRenderedFeature でフィーチャを問い合わせます。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>クリックしたポイント周囲のフィーチャを選択</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox-gl-js/v1.6.1/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v1.6.1/mapbox-gl.css" rel="stylesheet" />
<style>
	body { margin: 0; padding: 0; }
	#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
 
<script>
	mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [-98, 38.88],
minZoom: 2,
zoom: 3
});
 
map.on('load', function() {
// Add the source to query. In this example we're using
// county polygons uploaded as vector tiles
map.addSource('counties', {
'type': 'vector',
'url': 'mapbox://mapbox.82pkq93d'
});
 
map.addLayer(
{
'id': 'counties',
'type': 'fill',
'source': 'counties',
'source-layer': 'original',
'paint': {
'fill-outline-color': 'rgba(0,0,0,0.1)',
'fill-color': 'rgba(0,0,0,0.1)'
}
},
'settlement-label'
); // Place polygon under these labels.
 
map.addLayer(
{
'id': 'counties-highlighted',
'type': 'fill',
'source': 'counties',
'source-layer': 'original',
'paint': {
'fill-outline-color': '#484896',
'fill-color': '#6e599f',
'fill-opacity': 0.75
},
'filter': ['in', 'FIPS', '']
},
'settlement-label'
); // Place polygon under these labels.
 
map.on('click', function(e) {
// set bbox as 5px reactangle area around clicked point
var bbox = [
[e.point.x - 5, e.point.y - 5],
[e.point.x + 5, e.point.y + 5]
];
var features = map.queryRenderedFeatures(bbox, {
layers: ['counties']
});
 
// Run through the selected features and set a filter
// to match features with unique FIPS codes to activate
// the `counties-highlighted` layer.
var filter = features.reduce(
function(memo, feature) {
memo.push(feature.properties.FIPS);
return memo;
},
['in', 'FIPS']
);
 
map.setFilter('counties-highlighted', filter);
});
});
</script>
 
</body>
</html>