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To start developing, please head over to our developer documentation.

Activate the Google Maps JavaScript API

To get you started we'll guide you through the Google Developers Console to do a few things first:

  1. Create or choose a project
  2. Activate the Google Maps JavaScript API and related services
  3. Create appropriate keys
Continue

Data Layer: Earthquake data

Default style
Simple style
Advanced style

View the default, simple, or advanced examples full screen or check out the reference documentation for the data layer.

Try it yourself

Hover at top right of the code block to copy the code or open it in JSFiddle.

Default style

var 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
  var script = document.createElement('script');
  script.setAttribute('src',
    'https://storage.googleapis.com/maps-devrel/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);
}
<div id="map"></div>
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="initial-scale=1.0" />
    <style type="text/css">
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body id="map-container">
    <div id="map"></div>
    <script>

// [START script-body]
      var 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
        var script = document.createElement('script');
        script.setAttribute('src',
          'https://storage.googleapis.com/maps-devrel/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);
      }
// [END script-body]

    </script>
    <script async defer
        src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap"></script>
  </body>
</html>

Simple style

var 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
  var script = document.createElement('script');
  script.setAttribute('src',
      'https://storage.googleapis.com/maps-devrel/quakes.geo.json');
  document.getElementsByTagName('head')[0].appendChild(script);

  // Add a basic style.
  map.data.setStyle(function(feature) {
    var 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);
}
<div id="map"></div>
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="initial-scale=1.0" />
    <style type="text/css">
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body id="map-container">
    <div id="map"></div>
    <script>

// [START script-body]
      var 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
        var script = document.createElement('script');
        script.setAttribute('src',
            'https://storage.googleapis.com/maps-devrel/quakes.geo.json');
        document.getElementsByTagName('head')[0].appendChild(script);

        // Add a basic style.
        map.data.setStyle(function(feature) {
          var 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 script-body]

    </script>
    <script async defer
        src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap"></script>
  </body>
</html>

Advanced style

var 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
  var script = document.createElement('script');
  script.setAttribute('src',
    'https://storage.googleapis.com/maps-devrel/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) {
  var low = [151, 83, 34];   // color of mag 1.0
  var high = [5, 69, 54];  // color of mag 6.0 and above
  var minMag = 1.0;
  var maxMag = 6.0;

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

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

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

var 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}]
}];
<div id="map"></div>
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="initial-scale=1.0" />
    <style type="text/css">
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body id="map-container">
    <div id="map"></div>
    <script>
      var 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
        var script = document.createElement('script');
        script.setAttribute('src',
          'https://storage.googleapis.com/maps-devrel/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) {
        var low = [151, 83, 34];   // color of mag 1.0
        var high = [5, 69, 54];  // color of mag 6.0 and above
        var minMag = 1.0;
        var maxMag = 6.0;

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

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

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

      var 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}]
      }];
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>

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