Data Layer: Earthquakes

This example creates three different presentation styles for a dataset from the USGS recent earthquakes feed.

Check out the reference documentation for the data layer.

Default style

Default style: map

Default style: code example

TypeScript

let map: google.maps.Map;

function initMap(): void {
  map = new google.maps.Map(document.getElementById("map") as HTMLElement, {
    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);
}

// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data: any) {
  map.data.addGeoJson(data);
}
index.ts

JavaScript

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);
}

// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data) {
  map.data.addGeoJson(data);
}

index.js

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

style.css

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Default Data Layer: Earthquakes</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- Async script executes immediately and must be after any DOM elements used in callback. -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      async
    ></script>
  </body>
</html>
sample.html
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); } // Defines the callback function referenced in the jsonp file. function eqfeed_callback(data) { map.data.addGeoJson(data); }
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
<!DOCTYPE html> <html> <head> <title>Default Data Layer: Earthquakes</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=&v=weekly" async ></script> </body> </html>

Try Sample

Simple style

Simple style: map

Simple style: code example

TypeScript

let map: google.maps.Map;

function initMap(): void {
  map = new google.maps.Map(document.getElementById("map") as HTMLElement, {
    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: any) {
  map.data.addGeoJson(data);
}
index.ts

JavaScript

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);
}

index.js

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

style.css

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Simple Data Layer: Earthquakes</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- Async script executes immediately and must be after any DOM elements used in callback. -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      async
    ></script>
  </body>
</html>
sample.html
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); }
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
<!DOCTYPE html> <html> <head> <title>Simple Data Layer: Earthquakes</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=&v=weekly" async ></script> </body> </html>

Try Sample

Advanced style

Advanced style: map

Advanced style: code example

TypeScript

let map: google.maps.Map;

function initMap(): void {
  map = new google.maps.Map(document.getElementById("map") as HTMLElement, {
    center: { lat: 20, lng: -160 },
    zoom: 2,
    styles: mapStyle,
  });

  map.data.setStyle(styleFeature);

  // 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);
}

// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data: any) {
  map.data.addGeoJson(data);
}

function styleFeature(feature: google.maps.Data.Feature) {
  const low = [151, 83, 34]; // color of mag 1.0
  const high = [5, 69, 54]; // color of mag 6.0 and above
  const minMag = 1.0;
  const maxMag = 6.0;

  // fraction represents where the value sits between the min and max
  const fraction =
    (Math.min(feature.getProperty("mag"), maxMag) - minMag) / (maxMag - minMag);

  const color = interpolateHsl(low, high, fraction);

  return {
    icon: {
      path: google.maps.SymbolPath.CIRCLE,
      strokeWeight: 0.5,
      strokeColor: "#fff",
      fillColor: color,
      fillOpacity: 2 / feature.getProperty("mag"),
      // while an exponent would technically be correct, quadratic looks nicer
      scale: Math.pow(feature.getProperty("mag"), 2),
    },
    zIndex: Math.floor(feature.getProperty("mag")),
  };
}

function interpolateHsl(lowHsl: number[], highHsl: number[], fraction: number) {
  const color: number[] = [];

  for (let i = 0; i < 3; i++) {
    // Calculate color based on the fraction.
    color.push((highHsl[i] - lowHsl[i]) * fraction + lowHsl[i]);
  }

  return "hsl(" + color[0] + "," + color[1] + "%," + color[2] + "%)";
}

const mapStyle: google.maps.MapTypeStyle[] = [
  {
    featureType: "all",
    elementType: "all",
    stylers: [{ visibility: "off" }],
  },
  {
    featureType: "landscape",
    elementType: "geometry",
    stylers: [{ visibility: "on" }, { color: "#fcfcfc" }],
  },
  {
    featureType: "water",
    elementType: "labels",
    stylers: [{ visibility: "off" }],
  },
  {
    featureType: "water",
    elementType: "geometry",
    stylers: [{ visibility: "on" }, { hue: "#5f94ff" }, { lightness: 60 }],
  },
];
index.ts

JavaScript

let map;

function initMap() {
  map = new google.maps.Map(document.getElementById("map"), {
    center: { lat: 20, lng: -160 },
    zoom: 2,
    styles: mapStyle,
  });
  map.data.setStyle(styleFeature);
  // 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);
}

// Defines the callback function referenced in the jsonp file.
function eqfeed_callback(data) {
  map.data.addGeoJson(data);
}

function styleFeature(feature) {
  const low = [151, 83, 34]; // color of mag 1.0
  const high = [5, 69, 54]; // color of mag 6.0 and above
  const minMag = 1.0;
  const maxMag = 6.0;
  // fraction represents where the value sits between the min and max
  const fraction =
    (Math.min(feature.getProperty("mag"), maxMag) - minMag) / (maxMag - minMag);
  const color = interpolateHsl(low, high, fraction);
  return {
    icon: {
      path: google.maps.SymbolPath.CIRCLE,
      strokeWeight: 0.5,
      strokeColor: "#fff",
      fillColor: color,
      fillOpacity: 2 / feature.getProperty("mag"),
      // while an exponent would technically be correct, quadratic looks nicer
      scale: Math.pow(feature.getProperty("mag"), 2),
    },
    zIndex: Math.floor(feature.getProperty("mag")),
  };
}

function interpolateHsl(lowHsl, highHsl, fraction) {
  const color = [];

  for (let i = 0; i < 3; i++) {
    // Calculate color based on the fraction.
    color.push((highHsl[i] - lowHsl[i]) * fraction + lowHsl[i]);
  }
  return "hsl(" + color[0] + "," + color[1] + "%," + color[2] + "%)";
}
const mapStyle = [
  {
    featureType: "all",
    elementType: "all",
    stylers: [{ visibility: "off" }],
  },
  {
    featureType: "landscape",
    elementType: "geometry",
    stylers: [{ visibility: "on" }, { color: "#fcfcfc" }],
  },
  {
    featureType: "water",
    elementType: "labels",
    stylers: [{ visibility: "off" }],
  },
  {
    featureType: "water",
    elementType: "geometry",
    stylers: [{ visibility: "on" }, { hue: "#5f94ff" }, { lightness: 60 }],
  },
];

index.js

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

style.css

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Advanced Data Layer: Earthquakes</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- Async script executes immediately and must be after any DOM elements used in callback. -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      async
    ></script>
  </body>
</html>
sample.html
let map; function initMap() { map = new google.maps.Map(document.getElementById("map"), { center: { lat: 20, lng: -160 }, zoom: 2, styles: mapStyle, }); map.data.setStyle(styleFeature); // 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); } // Defines the callback function referenced in the jsonp file. function eqfeed_callback(data) { map.data.addGeoJson(data); } function styleFeature(feature) { const low = [151, 83, 34]; // color of mag 1.0 const high = [5, 69, 54]; // color of mag 6.0 and above const minMag = 1.0; const maxMag = 6.0; // fraction represents where the value sits between the min and max const fraction = (Math.min(feature.getProperty("mag"), maxMag) - minMag) / (maxMag - minMag); const color = interpolateHsl(low, high, fraction); return { icon: { path: google.maps.SymbolPath.CIRCLE, strokeWeight: 0.5, strokeColor: "#fff", fillColor: color, fillOpacity: 2 / feature.getProperty("mag"), // while an exponent would technically be correct, quadratic looks nicer scale: Math.pow(feature.getProperty("mag"), 2), }, zIndex: Math.floor(feature.getProperty("mag")), }; } function interpolateHsl(lowHsl, highHsl, fraction) { const color = []; for (let i = 0; i < 3; i++) { // Calculate color based on the fraction. color.push((highHsl[i] - lowHsl[i]) * fraction + lowHsl[i]); } return "hsl(" + color[0] + "," + color[1] + "%," + color[2] + "%)"; } const mapStyle = [ { featureType: "all", elementType: "all", stylers: [{ visibility: "off" }], }, { featureType: "landscape", elementType: "geometry", stylers: [{ visibility: "on" }, { color: "#fcfcfc" }], }, { featureType: "water", elementType: "labels", stylers: [{ visibility: "off" }], }, { featureType: "water", elementType: "geometry", stylers: [{ visibility: "on" }, { hue: "#5f94ff" }, { lightness: 60 }], }, ];
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
<!DOCTYPE html> <html> <head> <title>Advanced Data Layer: Earthquakes</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=&v=weekly" async ></script> </body> </html>

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