Create a heatmap layer
Visualize earthquake frequency by location using a heatmap layer.
<!DOCTYPE html><html><head><meta charset="utf-8" /><title>Create a heatmap layer</title><meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" /><script src="https://cdn.jsdelivr.net/npm/@goongmaps/goong-js@1.0.9/dist/goong-js.js"></script><link href="https://cdn.jsdelivr.net/npm/@goongmaps/goong-js@1.0.9/dist/goong-js.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>goongjs.accessToken = '8qzxZAuxcsctSlmOszInchP1A5GrmRBHJwCBCjO6';var map = new goongjs.Map({container: 'map',style: 'https://tiles.goong.io/assets/goong_map_web.json',center: [-120, 50],zoom: 2}); map.on('load', function () {// Add a geojson point source.// Heatmap layers also work with a vector tile source.map.addSource('earthquakes', {'type': 'geojson','data': 'https://docs.goong.io/assets/earthquakes.geojson'}); map.addLayer({'id': 'earthquakes-heat','type': 'heatmap','source': 'earthquakes','maxzoom': 9,'paint': {// Increase the heatmap weight based on frequency and property magnitude'heatmap-weight': ['interpolate',['linear'],['get', 'mag'],0,0,6,1],// Increase the heatmap color weight weight by zoom level// heatmap-intensity is a multiplier on top of heatmap-weight'heatmap-intensity': ['interpolate',['linear'],['zoom'],0,1,9,3],// Color ramp for heatmap. Domain is 0 (low) to 1 (high).// Begin color ramp at 0-stop with a 0-transparancy color// to create a blur-like effect.'heatmap-color': ['interpolate',['linear'],['heatmap-density'],0,'rgba(33,102,172,0)',0.2,'rgb(103,169,207)',0.4,'rgb(209,229,240)',0.6,'rgb(253,219,199)',0.8,'rgb(239,138,98)',1,'rgb(178,24,43)'],// Adjust the heatmap radius by zoom level'heatmap-radius': ['interpolate',['linear'],['zoom'],0,2,9,20],// Transition from heatmap to circle layer by zoom level'heatmap-opacity': ['interpolate',['linear'],['zoom'],7,1,9,0]}},'water'); map.addLayer({'id': 'earthquakes-point','type': 'circle','source': 'earthquakes','minzoom': 7,'paint': {// Size circle radius by earthquake magnitude and zoom level'circle-radius': ['interpolate',['linear'],['zoom'],7,['interpolate', ['linear'], ['get', 'mag'], 1, 1, 6, 4],16,['interpolate', ['linear'], ['get', 'mag'], 1, 5, 6, 50]],// Color circle by earthquake magnitude'circle-color': ['interpolate',['linear'],['get', 'mag'],1,'rgba(33,102,172,0)',2,'rgb(103,169,207)',3,'rgb(209,229,240)',4,'rgb(253,219,199)',5,'rgb(239,138,98)',6,'rgb(178,24,43)'],'circle-stroke-color': 'white','circle-stroke-width': 1,// Transition from heatmap to circle layer by zoom level'circle-opacity': ['interpolate',['linear'],['zoom'],7,0,8,1]}},'water');});</script> </body></html>