ラベル下に新しいレイヤーを追加
addLayer の 2 番目の引数を使用すると、より正確に行うことができます。
<!DOCTYPE html><html><head><meta charset="utf-8" /><title>ラベル下に新しいレイヤーを追加</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: [-88.13734351262877, 35.137451890638886],zoom: 4}); map.on('load', function() {var layers = map.getStyle().layers;// Find the index of the first symbol layer in the map stylevar firstSymbolId;for (var i = 0; i < layers.length; i++) {if (layers[i].type === 'symbol') {firstSymbolId = layers[i].id;break;}}map.addLayer({'id': 'urban-areas-fill','type': 'fill','source': {'type': 'geojson','data':'https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_50m_urban_areas.geojson'},'layout': {},'paint': {'fill-color': '#f08','fill-opacity': 0.4}// This is the important part of this example: the addLayer// method takes 2 arguments: the layer as an object, and a string// representing another layer's name. if the other layer// exists in the stylesheet already, the new layer will be positioned// right before that layer in the stack, making it possible to put// 'overlays' anywhere in the layer stack.// Insert the layer beneath the first symbol layer.},firstSymbolId);});</script> </body></html>