A GPX track plugin for Leaflet.js
JavaScript
Latest commit 781a0bc Feb 15, 2017 @mpetazzoni committed on GitHub Merge pull request #50 from stefanclark/patch-1
Fix for fallback when waypoint icon URL isn't configured

README.md

GPX plugin for Leaflet

CDNJS

Leaflet is a Javascript library for displaying interactive maps. This plugin, based on the work of Pavel Shramov and his leaflet-plugins, it allows for the analysis and parsing of a GPX track in order to display it as a Leaflet map layer. As it parses the GPX data, it will record information about the recorded track, including total time, moving time, total distance, elevation stats and heart-rate.

GPX parsing will automatically handle pauses in the track with a default tolerance interval of 15 seconds between points. You can configure this interval by setting max_point_interval, in milliseconds, in the options passed to the GPX constructor.

I've put together a complete example as a demo.

License

leaflet-gpx is under the BSD 2-clause license. Please refer to the attached LICENSE file and/or to the copyright header in gpx.js for more information.

Usage

Usage is very simple. First, include the Leaflet.js and Leaflet-GPX scripts in your HTML page:

<html>
  <head>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.css" />
    <!-- ... -->
  </head>
  <body>
    <!-- ... -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-gpx/1.3.0/gpx.min.js"></script>
  </body>
</html>

Now, let's consider we have a Leaflet map:

var map = L.map('map');
L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
  attribution: 'Map data &copy; <a href="http://www.osm.org">OpenStreetMap</a>'
}).addTo(map);

Displaying a GPX track on it is as easy as:

var gpx = '...'; // URL to your GPX file or the GPX itself
new L.GPX(gpx, {async: true}).on('loaded', function(e) {
  map.fitBounds(e.target.getBounds());
}).addTo(map);

You can change the GPX track's appearance with a polyline_options object in the second argument of the constructor. Available options are listed in the Leaflet documentation.

Some GPX tracks contain the actual route/track twice, both the <trk> and <rte> elements are used. You can tell leaflet-gpx which tag to use or to use both (which is the default setting for backwards compatibility) with the gpx_options object in the second argument of the constructor. The member parseElements controls this behavior, it should be an array that contains 'route' and/or 'track'.

If you want to display additional information about the GPX track, you can do so in the 'loaded' event handler, calling one of the following methods on the GPX object e.target:

  • get_name(): returns the name of the GPX track
  • get_distance(): returns the total track distance, in meters
  • get_start_time(): returns a Javascript Date object representing the starting time
  • get_end_time(): returns a Javascript Date object representing when the last point was recorded
  • get_moving_time(): returns the moving time, in milliseconds
  • get_total_time(): returns the total track time, in milliseconds
  • get_moving_pace(): returns the average moving pace in milliseconds per km
  • get_moving_speed(): returns the average moving speed in km per hour
  • get_total_speed(): returns the average total speed in km per hour
  • get_elevation_min(): returns the lowest elevation, in meters
  • get_elevation_max(): returns the highest elevation, in meters
  • get_elevation_gain(): returns the cumulative elevation gain, in meters
  • get_elevation_loss(): returns the cumulative elevation loss, in meters
  • get_average_hr(): returns the average heart rate (if available)

If you're not a fan of the metric system, you also have the following methods at your disposal:

  • get_distance_imp(): returns the total track distance in miles
  • get_moving_pace_imp(): returns the average moving pace in milliseconds per hour
  • get_moving_speed_imp(): returns the average moving speed in miles per hour
  • get_total_speed_imp(): returns the average total speed in miles per hour
  • get_elevation_min_imp(): returns the lowest elevation, in feet
  • get_elevation_max_imp(): returns the highest elevation, in feet
  • get_elevation_gain_imp(): returns the cumulative elevation gain, in feet
  • get_elevation_loss_imp(): returns the cumulative elevation loss, in feet

The reason why these methods return milliseconds is that you have at your disposal a nice helper method to format a duration in milliseconds into a cool string like 3:07'48" or 59'32.431:

  • get_duration_string(duration, hidems), where duration is in milliseconds and hidems is an optional boolean you can use to request never to display millisecond precision.

You can also get full elevation and heartrate data with:

  • get_elevation_data() and get_elevation_data_imp()
  • get_heartrate_data() and get_heartrate_data_imp()

These methods all return an array of points [distance, value, tooltip] where the distance is either in kilometers or in miles and the elevation in meters of feet, depending on whether you use the _imp variant or not. Heart rate, obviously, doesn't change.

You can reload remote gpx file every 5 seconds with:

var gpxLayer = new L.GPX(gpxFile);

setInterval(function() {
    gpxLayer.reload();
},5000);

About marker icons

By default gpx.js will use pin-icon-start.png, pin-icon-end.png and pin-shadow.png as the marker icons URLs for, respectively, the start marker, the end marker and their drop shadow. Since it might not be convenient that these images have to reside under the same directory as your HTML page, it is possible to override the marker icon URLs and sizes by passing a marker_options object to the GPX options object.

The field names are the same as for custom Leaflet icons, as explained in the Markers with custom icons page in Leaflet's documentation. The only difference is that instead of iconUrl you should specify startIconUrl and endIconUrl for the start and end markers, respectively.

Note that you do not need to override all the marker icon options as gpx.js will use sensible defaults with sizes matching the provided icon images. Here is how you would override the URL of the provided icons if you decided to place them in an images/ directory:

var url = '...'; // URL to your GPX file
new L.GPX(url, {
  async: true,
  marker_options: {
    startIconUrl: 'images/pin-icon-start.png',
    endIconUrl: 'images/pin-icon-end.png',
    shadowUrl: 'images/pin-shadow.png'
  }
}).on('loaded', function(e) {
  map.fitBounds(e.target.getBounds());
}).addTo(map);

About waypoints

By default gpx.js will parse Waypoints from a GPX file. This may also be steered via the value waypoint in gpx_options, e.g. parseElements: ['track', 'route', 'waypoint'].

Waypoint icons: by default the pin-icon-wpt.png icon is shown for each waypoint. This can be overridden by setting marker_options.wptIconUrls in the L.GPX constructor options, as a mapping from the waypoint "SYM" name to a user-supplied icon file or URL. The empty string '' is used by the waypoint tag does not define a "SYM" name. See the example below:

new L.GPX(app.params.gpx_url, {
  async: true,
  marker_options: {
    wptIconUrls: {
      '': 'img/gpx/default-waypoint.png',
      'Geocache Found': 'img/gpx/geocache.png',
      'Park': 'img/gpx/tree.png'
    },
    ...
    shadowUrl: 'http://github.com/mpetazzoni/leaflet-gpx/raw/master/pin-shadow.png'
  }
}).on('loaded', function (e) {
  var gpx = e.target;
  map.fitBounds(gpx.getBounds());
}).addTo(map);

Custom markers

You can also use your own icons/markers if you want to use custom markers, for example from leaflet-awesome-markers. To specify you own markers, set startIcon, endIcon, and a map of wptIcons by waypoint symbol (see above). Those should be marker icon objects usable by Leaflet as the icon property of a L.Marker object.

new L.GPX(app.params.gpx_url, {
  async: true,
  marker_options: {
    wptIcons: {
      'Coffee shop': new L.AwesomeMarkers.icon({
        icon: 'coffee',
        prefix: 'fa',
        markerColor: 'blue',
        iconColor: 'white'
      })
    }
  }
}).on('loaded', function (e) {
  var gpx = e.target;
  map.fitBounds(gpx.getBounds());
}).addTo(map);

Caveats

  • Distance calculation is relatively accurate, but elevation change calculation is not topographically adjusted, so the total elevation gain/loss/change might appear inaccurate in some situations.
  • Currently doesn't seem to work in IE8/9. See #9 and #11 for discussion.