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Showing Elevation Along a Path

This example displays a graph that shows the elevation along a path drawn on the map.

Read the documentation.

JavaScript

// Load the Visualization API and the columnchart package.
google.load("visualization", "1", { packages: ["columnchart"] });

function initMap() {
  // The following path marks a path from Mt. Whitney, the highest point in the
  // continental United States to Badwater, Death Valley, the lowest point.
  var path = [
    { lat: 36.579, lng: -118.292 }, // Mt. Whitney
    { lat: 36.606, lng: -118.0638 }, // Lone Pine
    { lat: 36.433, lng: -117.951 }, // Owens Lake
    { lat: 36.588, lng: -116.943 }, // Beatty Junction
    { lat: 36.34, lng: -117.468 }, // Panama Mint Springs
    { lat: 36.24, lng: -116.832 }
  ]; // Badwater, Death Valley

  var map = new google.maps.Map(document.getElementById("map"), {
    zoom: 8,
    center: path[1],
    mapTypeId: "terrain"
  });

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

  // Draw the path, using the Visualization API and the Elevation service.
  displayPathElevation(path, elevator, map);
}

function displayPathElevation(path, elevator, map) {
  // Display a polyline of the elevation path.
  new google.maps.Polyline({
    path: path,
    strokeColor: "#0000CC",
    strokeOpacity: 0.4,
    map: map
  });

  // Create a PathElevationRequest object using this array.
  // Ask for 256 samples along that path.
  // Initiate the path request.
  elevator.getElevationAlongPath(
    {
      path: path,
      samples: 256
    },
    plotElevation
  );
}

// Takes an array of ElevationResult objects, draws the path on the map
// and plots the elevation profile on a Visualization API ColumnChart.
function plotElevation(elevations, status) {
  var chartDiv = document.getElementById("elevation_chart");
  if (status !== "OK") {
    // Show the error code inside the chartDiv.
    chartDiv.innerHTML =
      "Cannot show elevation: request failed because " + status;
    return;
  }
  // Create a new chart in the elevation_chart DIV.
  var chart = new google.visualization.ColumnChart(chartDiv);

  // Extract the data from which to populate the chart.
  // Because the samples are equidistant, the 'Sample'
  // column here does double duty as distance along the
  // X axis.
  var data = new google.visualization.DataTable();
  data.addColumn("string", "Sample");
  data.addColumn("number", "Elevation");
  for (var i = 0; i < elevations.length; i++) {
    data.addRow(["", elevations[i].elevation]);
  }

  // Draw the chart using the data within its DIV.
  chart.draw(data, {
    height: 150,
    legend: "none",
    titleY: "Elevation (m)"
  });
}

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;
}

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Showing Elevation Along a Path</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script src="https://www.google.com/jsapi"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./app.js"></script>
  </head>
  <body>
    <div>
      <div id="map" style="height:250px;"></div>
      <div id="elevation_chart"></div>
    </div>
  </body>
</html>

All

<!DOCTYPE html>
<html>
  <head>
    <title>Showing Elevation Along a Path</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script src="https://www.google.com/jsapi"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <style type="text/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>
    <script>
      (function(exports) {
        "use strict";

        // Load the Visualization API and the columnchart package.
        google.load("visualization", "1", {
          packages: ["columnchart"]
        });

        function initMap() {
          // The following path marks a path from Mt. Whitney, the highest point in the
          // continental United States to Badwater, Death Valley, the lowest point.
          var path = [
            {
              lat: 36.579,
              lng: -118.292
            }, // Mt. Whitney
            {
              lat: 36.606,
              lng: -118.0638
            }, // Lone Pine
            {
              lat: 36.433,
              lng: -117.951
            }, // Owens Lake
            {
              lat: 36.588,
              lng: -116.943
            }, // Beatty Junction
            {
              lat: 36.34,
              lng: -117.468
            }, // Panama Mint Springs
            {
              lat: 36.24,
              lng: -116.832
            }
          ]; // Badwater, Death Valley

          var map = new google.maps.Map(document.getElementById("map"), {
            zoom: 8,
            center: path[1],
            mapTypeId: "terrain"
          }); // Create an ElevationService.

          var elevator = new google.maps.ElevationService(); // Draw the path, using the Visualization API and the Elevation service.

          displayPathElevation(path, elevator, map);
        }

        function displayPathElevation(path, elevator, map) {
          // Display a polyline of the elevation path.
          new google.maps.Polyline({
            path: path,
            strokeColor: "#0000CC",
            strokeOpacity: 0.4,
            map: map
          }); // Create a PathElevationRequest object using this array.
          // Ask for 256 samples along that path.
          // Initiate the path request.

          elevator.getElevationAlongPath(
            {
              path: path,
              samples: 256
            },
            plotElevation
          );
        } // Takes an array of ElevationResult objects, draws the path on the map
        // and plots the elevation profile on a Visualization API ColumnChart.

        function plotElevation(elevations, status) {
          var chartDiv = document.getElementById("elevation_chart");

          if (status !== "OK") {
            // Show the error code inside the chartDiv.
            chartDiv.innerHTML =
              "Cannot show elevation: request failed because " + status;
            return;
          } // Create a new chart in the elevation_chart DIV.

          var chart = new google.visualization.ColumnChart(chartDiv); // Extract the data from which to populate the chart.
          // Because the samples are equidistant, the 'Sample'
          // column here does double duty as distance along the
          // X axis.

          var data = new google.visualization.DataTable();
          data.addColumn("string", "Sample");
          data.addColumn("number", "Elevation");

          for (var i = 0; i < elevations.length; i++) {
            data.addRow(["", elevations[i].elevation]);
          } // Draw the chart using the data within its DIV.

          chart.draw(data, {
            height: 150,
            legend: "none",
            titleY: "Elevation (m)"
          });
        }

        exports.displayPathElevation = displayPathElevation;
        exports.initMap = initMap;
        exports.plotElevation = plotElevation;
      })((this.window = this.window || {}));
    </script>
  </head>
  <body>
    <div>
      <div id="map" style="height:250px;"></div>
      <div id="elevation_chart"></div>
    </div>
  </body>
</html>
(function(exports) { "use strict"; // Load the Visualization API and the columnchart package. google.load("visualization", "1", { packages: ["columnchart"] }); function initMap() { // The following path marks a path from Mt. Whitney, the highest point in the // continental United States to Badwater, Death Valley, the lowest point. var path = [ { lat: 36.579, lng: -118.292 }, // Mt. Whitney { lat: 36.606, lng: -118.0638 }, // Lone Pine { lat: 36.433, lng: -117.951 }, // Owens Lake { lat: 36.588, lng: -116.943 }, // Beatty Junction { lat: 36.34, lng: -117.468 }, // Panama Mint Springs { lat: 36.24, lng: -116.832 } ]; // Badwater, Death Valley var map = new google.maps.Map(document.getElementById("map"), { zoom: 8, center: path[1], mapTypeId: "terrain" }); // Create an ElevationService. var elevator = new google.maps.ElevationService(); // Draw the path, using the Visualization API and the Elevation service. displayPathElevation(path, elevator, map); } function displayPathElevation(path, elevator, map) { // Display a polyline of the elevation path. new google.maps.Polyline({ path: path, strokeColor: "#0000CC", strokeOpacity: 0.4, map: map }); // Create a PathElevationRequest object using this array. // Ask for 256 samples along that path. // Initiate the path request. elevator.getElevationAlongPath( { path: path, samples: 256 }, plotElevation ); } // Takes an array of ElevationResult objects, draws the path on the map // and plots the elevation profile on a Visualization API ColumnChart. function plotElevation(elevations, status) { var chartDiv = document.getElementById("elevation_chart"); if (status !== "OK") { // Show the error code inside the chartDiv. chartDiv.innerHTML = "Cannot show elevation: request failed because " + status; return; } // Create a new chart in the elevation_chart DIV. var chart = new google.visualization.ColumnChart(chartDiv); // Extract the data from which to populate the chart. // Because the samples are equidistant, the 'Sample' // column here does double duty as distance along the // X axis. var data = new google.visualization.DataTable(); data.addColumn("string", "Sample"); data.addColumn("number", "Elevation"); for (var i = 0; i < elevations.length; i++) { data.addRow(["", elevations[i].elevation]); } // Draw the chart using the data within its DIV. chart.draw(data, { height: 150, legend: "none", titleY: "Elevation (m)" }); } exports.displayPathElevation = displayPathElevation; exports.initMap = initMap; exports.plotElevation = plotElevation; })((this.window = this.window || {}));
/* 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>Showing Elevation Along a Path</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://www.google.com/jsapi"></script> <script src="https://maps.googleapis.com/maps/api/js?key=&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div> <div id="map" style="height:250px;"></div> <div id="elevation_chart"></div> </div> </body> </html>