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

Elevation service

This example demonstrates the use of the ElevationService object. Click on the map to display the elevation at the clicked point.

Read the documentation or view this example full screen.

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 8,
    center: {lat: 63.333, lng: -150.5},  // Denali.
    mapTypeId: 'terrain'
  });
  var elevator = new google.maps.ElevationService;
  var infowindow = new google.maps.InfoWindow({map: map});

  // Add a listener for the click event. Display the elevation for the LatLng of
  // the click inside the infowindow.
  map.addListener('click', function(event) {
    displayLocationElevation(event.latLng, elevator, infowindow);
  });
}

function displayLocationElevation(location, elevator, infowindow) {
  // Initiate the location request
  elevator.getElevationForLocations({
    'locations': [location]
  }, function(results, status) {
    infowindow.setPosition(location);
    if (status === 'OK') {
      // Retrieve the first result
      if (results[0]) {
        // Open the infowindow indicating the elevation at the clicked position.
        infowindow.setContent('The elevation at this point <br>is ' +
            results[0].elevation + ' meters.');
      } else {
        infowindow.setContent('No results found');
      }
    } else {
      infowindow.setContent('Elevation service failed due to: ' + status);
    }
  });
}
<div id="map"></div>
/* 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;
}
 <!-- 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 name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Elevation service</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;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      function initMap() {
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 8,
          center: {lat: 63.333, lng: -150.5},  // Denali.
          mapTypeId: 'terrain'
        });
        var elevator = new google.maps.ElevationService;
        var infowindow = new google.maps.InfoWindow({map: map});

        // Add a listener for the click event. Display the elevation for the LatLng of
        // the click inside the infowindow.
        map.addListener('click', function(event) {
          displayLocationElevation(event.latLng, elevator, infowindow);
        });
      }

      function displayLocationElevation(location, elevator, infowindow) {
        // Initiate the location request
        elevator.getElevationForLocations({
          'locations': [location]
        }, function(results, status) {
          infowindow.setPosition(location);
          if (status === 'OK') {
            // Retrieve the first result
            if (results[0]) {
              // Open the infowindow indicating the elevation at the clicked position.
              infowindow.setContent('The elevation at this point <br>is ' +
                  results[0].elevation + ' meters.');
            } else {
              infowindow.setContent('No results found');
            }
          } else {
            infowindow.setContent('Elevation service failed due to: ' + status);
          }
        });
      }
    </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。