以上で完了です。

開発を始めるには、デベロッパー ドキュメント をご覧下さい。

Google Maps JavaScript API をアクティベートする

まず初めに Google Developers Console で次の作業を行います。

  1. プロジェクトを作成または選択する
  2. Google Maps JavaScript API と関連サービスをアクティベートする
  3. 適切なキーを作成する
続ける

Custom map projections

Read the documentation or view this example full screen.

// This example defines an image map type using the Gall-Peters
// projection.
// https://en.wikipedia.org/wiki/Gall%E2%80%93Peters_projection

function initMap() {
  // Create a map. Use the Gall-Peters map type.
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 0,
    center: {lat: 0, lng: 0},
    mapTypeControl: false
  });

  initGallPeters();
  map.mapTypes.set('gallPeters', gallPetersMapType);
  map.setMapTypeId('gallPeters');

  // Show the lat and lng under the mouse cursor.
  var coordsDiv = document.getElementById('coords');
  map.controls[google.maps.ControlPosition.TOP_CENTER].push(coordsDiv);
  map.addListener('mousemove', function(event) {
    coordsDiv.textContent =
        'lat: ' + Math.round(event.latLng.lat()) + ', ' +
        'lng: ' + Math.round(event.latLng.lng());
  });

  // Add some markers to the map.
  map.data.setStyle(function(feature) {
    return {
      title: feature.getProperty('name'),
      optimized: false
    };
  });
  map.data.addGeoJson(cities);
}

var gallPetersMapType;
function initGallPeters() {
  var GALL_PETERS_RANGE_X = 800;
  var GALL_PETERS_RANGE_Y = 512;

  // Fetch Gall-Peters tiles stored locally on our server.
  gallPetersMapType = new google.maps.ImageMapType({
    getTileUrl: function(coord, zoom) {
      var scale = 1 << zoom;

      // Wrap tiles horizontally.
      var x = ((coord.x % scale) + scale) % scale;

      // Don't wrap tiles vertically.
      var y = coord.y;
      if (y < 0 || y >= scale) return null;

      return 'https://developers.google.com/maps/documentation/' +
             'javascript/examples/full/images/gall-peters_' + zoom +
             '_' + x + '_' + y + '.png';
    },
    tileSize: new google.maps.Size(GALL_PETERS_RANGE_X, GALL_PETERS_RANGE_Y),
    isPng: true,
    minZoom: 0,
    maxZoom: 1,
    name: 'Gall-Peters'
  });

  // Describe the Gall-Peters projection used by these tiles.
  gallPetersMapType.projection = {
    fromLatLngToPoint: function(latLng) {
      var latRadians = latLng.lat() * Math.PI / 180;
      return new google.maps.Point(
          GALL_PETERS_RANGE_X * (0.5 + latLng.lng() / 360),
          GALL_PETERS_RANGE_Y * (0.5 - 0.5 * Math.sin(latRadians)));
    },
    fromPointToLatLng: function(point, noWrap) {
      var x = point.x / GALL_PETERS_RANGE_X;
      var y = Math.max(0, Math.min(1, point.y / GALL_PETERS_RANGE_Y));

      return new google.maps.LatLng(
          Math.asin(1 - 2 * y) * 180 / Math.PI,
          -180 + 360 * x,
          noWrap);
    }
  };
}

// GeoJSON, describing the locations and names of some cities.
var cities = {
  type: 'FeatureCollection',
  features: [{
    type: 'Feature',
    geometry: {type: 'Point', coordinates: [-87.650, 41.850]},
    properties: {name: 'Chicago'}
  }, {
    type: 'Feature',
    geometry: {type: 'Point', coordinates: [-149.900, 61.218]},
    properties: {name: 'Anchorage'}
  }, {
    type: 'Feature',
    geometry: {type: 'Point', coordinates: [-99.127, 19.427]},
    properties: {name: 'Mexico City'}
  }, {
    type: 'Feature',
    geometry: {type: 'Point', coordinates: [-0.126, 51.500]},
    properties: {name: 'London'}
  }, {
    type: 'Feature',
    geometry: {type: 'Point', coordinates: [28.045, -26.201]},
    properties: {name: 'Johannesburg'}
  }, {
    type: 'Feature',
    geometry: {type: 'Point', coordinates: [15.322, -4.325]},
    properties: {name: 'Kinshasa'}
  }, {
    type: 'Feature',
    geometry: {type: 'Point', coordinates: [151.207, -33.867]},
    properties: {name: 'Sydney'}
  }, {
    type: 'Feature',
    geometry: {type: 'Point', coordinates: [0, 0]},
    properties: {name: '0°N 0°E'}
  }]
};
<div id="map"></div>
<div id="coords"></div>
#coords {
  background-color: black;
  color: white;
  padding: 5px;
}
<!-- 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>

実際に試す

コードブロックの右上にカーソルを合わせて、コードをコピーするか、コードを JSFiddl で開きます。

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Custom map projections</title>
    <style>
      /* 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;
      }
      #coords {
        background-color: black;
        color: white;
        padding: 5px;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <div id="coords"></div>
    <script>
      // This example defines an image map type using the Gall-Peters
      // projection.
      // https://en.wikipedia.org/wiki/Gall%E2%80%93Peters_projection

      function initMap() {
        // Create a map. Use the Gall-Peters map type.
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 0,
          center: {lat: 0, lng: 0},
          mapTypeControl: false
        });

        initGallPeters();
        map.mapTypes.set('gallPeters', gallPetersMapType);
        map.setMapTypeId('gallPeters');

        // Show the lat and lng under the mouse cursor.
        var coordsDiv = document.getElementById('coords');
        map.controls[google.maps.ControlPosition.TOP_CENTER].push(coordsDiv);
        map.addListener('mousemove', function(event) {
          coordsDiv.textContent =
              'lat: ' + Math.round(event.latLng.lat()) + ', ' +
              'lng: ' + Math.round(event.latLng.lng());
        });

        // Add some markers to the map.
        map.data.setStyle(function(feature) {
          return {
            title: feature.getProperty('name'),
            optimized: false
          };
        });
        map.data.addGeoJson(cities);
      }

      var gallPetersMapType;
      function initGallPeters() {
        var GALL_PETERS_RANGE_X = 800;
        var GALL_PETERS_RANGE_Y = 512;

        // Fetch Gall-Peters tiles stored locally on our server.
        gallPetersMapType = new google.maps.ImageMapType({
          getTileUrl: function(coord, zoom) {
            var scale = 1 << zoom;

            // Wrap tiles horizontally.
            var x = ((coord.x % scale) + scale) % scale;

            // Don't wrap tiles vertically.
            var y = coord.y;
            if (y < 0 || y >= scale) return null;

            return 'https://developers.google.com/maps/documentation/' +
                   'javascript/examples/full/images/gall-peters_' + zoom +
                   '_' + x + '_' + y + '.png';
          },
          tileSize: new google.maps.Size(GALL_PETERS_RANGE_X, GALL_PETERS_RANGE_Y),
          isPng: true,
          minZoom: 0,
          maxZoom: 1,
          name: 'Gall-Peters'
        });

        // Describe the Gall-Peters projection used by these tiles.
        gallPetersMapType.projection = {
          fromLatLngToPoint: function(latLng) {
            var latRadians = latLng.lat() * Math.PI / 180;
            return new google.maps.Point(
                GALL_PETERS_RANGE_X * (0.5 + latLng.lng() / 360),
                GALL_PETERS_RANGE_Y * (0.5 - 0.5 * Math.sin(latRadians)));
          },
          fromPointToLatLng: function(point, noWrap) {
            var x = point.x / GALL_PETERS_RANGE_X;
            var y = Math.max(0, Math.min(1, point.y / GALL_PETERS_RANGE_Y));

            return new google.maps.LatLng(
                Math.asin(1 - 2 * y) * 180 / Math.PI,
                -180 + 360 * x,
                noWrap);
          }
        };
      }

      // GeoJSON, describing the locations and names of some cities.
      var cities = {
        type: 'FeatureCollection',
        features: [{
          type: 'Feature',
          geometry: {type: 'Point', coordinates: [-87.650, 41.850]},
          properties: {name: 'Chicago'}
        }, {
          type: 'Feature',
          geometry: {type: 'Point', coordinates: [-149.900, 61.218]},
          properties: {name: 'Anchorage'}
        }, {
          type: 'Feature',
          geometry: {type: 'Point', coordinates: [-99.127, 19.427]},
          properties: {name: 'Mexico City'}
        }, {
          type: 'Feature',
          geometry: {type: 'Point', coordinates: [-0.126, 51.500]},
          properties: {name: 'London'}
        }, {
          type: 'Feature',
          geometry: {type: 'Point', coordinates: [28.045, -26.201]},
          properties: {name: 'Johannesburg'}
        }, {
          type: 'Feature',
          geometry: {type: 'Point', coordinates: [15.322, -4.325]},
          properties: {name: 'Kinshasa'}
        }, {
          type: 'Feature',
          geometry: {type: 'Point', coordinates: [151.207, -33.867]},
          properties: {name: 'Sydney'}
        }, {
          type: 'Feature',
          geometry: {type: 'Point', coordinates: [0, 0]},
          properties: {name: '0°N 0°E'}
        }]
      };
    </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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Google Maps JavaScript API
Google Maps JavaScript API
ご不明な点がありましたら、Google のサポートページをご覧ください。