Google Maps JavaScript API v3

Elevation service

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JavaScript
var elevator;
var map;
var infowindow = new google.maps.InfoWindow();
var denali = new google.maps.LatLng(63.3333333, -150.5);

function initialize() {
  var mapOptions = {
    zoom: 8,
    center: denali,
    mapTypeId: 'terrain'
  }
  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  // Create an ElevationService
  elevator = new google.maps.ElevationService();

  // Add a listener for the click event and call getElevation on that location
  google.maps.event.addListener(map, 'click', getElevation);
}

function getElevation(event) {

  var locations = [];

  // Retrieve the clicked location and push it on the array
  var clickedLocation = event.latLng;
  locations.push(clickedLocation);

  // Create a LocationElevationRequest object using the array's one value
  var positionalRequest = {
    'locations': locations
  }

  // Initiate the location request
  elevator.getElevationForLocations(positionalRequest, function(results, status) {
    if (status == google.maps.ElevationStatus.OK) {

      // Retrieve the first result
      if (results[0]) {

        // Open an info window indicating the elevation at the clicked position
        infowindow.setContent('The elevation at this point <br>is ' + results[0].elevation + ' meters.');
        infowindow.setPosition(clickedLocation);
        infowindow.open(map);
      } else {
        alert('No results found');
      }
    } else {
      alert('Elevation service failed due to: ' + status);
    }
  });
}

google.maps.event.addDomListener(window, 'load', initialize);
JavaScript + HTML
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Elevation service</title>
    <style>
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }
    </style>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
    <script>
var elevator;
var map;
var infowindow = new google.maps.InfoWindow();
var denali = new google.maps.LatLng(63.3333333, -150.5);

function initialize() {
  var mapOptions = {
    zoom: 8,
    center: denali,
    mapTypeId: 'terrain'
  }
  map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

  // Create an ElevationService
  elevator = new google.maps.ElevationService();

  // Add a listener for the click event and call getElevation on that location
  google.maps.event.addListener(map, 'click', getElevation);
}

function getElevation(event) {

  var locations = [];

  // Retrieve the clicked location and push it on the array
  var clickedLocation = event.latLng;
  locations.push(clickedLocation);

  // Create a LocationElevationRequest object using the array's one value
  var positionalRequest = {
    'locations': locations
  }

  // Initiate the location request
  elevator.getElevationForLocations(positionalRequest, function(results, status) {
    if (status == google.maps.ElevationStatus.OK) {

      // Retrieve the first result
      if (results[0]) {

        // Open an info window indicating the elevation at the clicked position
        infowindow.setContent('The elevation at this point <br>is ' + results[0].elevation + ' meters.');
        infowindow.setPosition(clickedLocation);
        infowindow.open(map);
      } else {
        alert('No results found');
      }
    } else {
      alert('Elevation service failed due to: ' + status);
    }
  });
}

google.maps.event.addDomListener(window, 'load', initialize);

    </script>
  </head>
  <body>
    <div id="map-canvas"></div>
  </body>
</html>

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