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index.js
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index.js
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// [START maps_layer_data_quakes_red]
let map;
function initMap() {
map = new google.maps.Map(document.getElementById("map"), {
center: { lat: 20, lng: -160 },
zoom: 2,
});
// Get the earthquake data (JSONP format)
// This feed is a copy from the USGS feed, you can find the originals here:
// http://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php
const script = document.createElement("script");
script.setAttribute(
"src",
"https://storage.googleapis.com/mapsdevsite/json/quakes.geo.json"
);
document.getElementsByTagName("head")[0].appendChild(script);
// Add a basic style.
map.data.setStyle((feature) => {
const mag = Math.exp(parseFloat(feature.getProperty("mag"))) * 0.1;
return /** @type {google.maps.Data.StyleOptions} */ {
icon: {
path: google.maps.SymbolPath.CIRCLE,
scale: mag,
fillColor: "#f00",
fillOpacity: 0.35,
strokeWeight: 0,
},
};
});
}
// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data) {
map.data.addGeoJson(data);
}
// [END maps_layer_data_quakes_red]