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.
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 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/1.3.1/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 © <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 trackget_distance(): returns the total track distance, in metersget_start_time(): returns a JavascriptDateobject representing the starting timeget_end_time(): returns a JavascriptDateobject representing when the last point was recordedget_moving_time(): returns the moving time, in millisecondsget_total_time(): returns the total track time, in millisecondsget_moving_pace(): returns the average moving pace in milliseconds per kmget_moving_speed(): returns the average moving speed in km per hourget_total_speed(): returns the average total speed in km per hourget_elevation_min(): returns the lowest elevation, in metersget_elevation_max(): returns the highest elevation, in metersget_elevation_gain(): returns the cumulative elevation gain, in metersget_elevation_loss(): returns the cumulative elevation loss, in metersget_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 milesget_moving_pace_imp(): returns the average moving pace in milliseconds per hourget_moving_speed_imp(): returns the average moving speed in miles per hourget_total_speed_imp(): returns the average total speed in miles per hourget_elevation_min_imp(): returns the lowest elevation, in feetget_elevation_max_imp(): returns the highest elevation, in feetget_elevation_gain_imp(): returns the cumulative elevation gain, in feetget_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), wheredurationis in milliseconds andhidemsis 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()andget_elevation_data_imp()get_heartrate_data()andget_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);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);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);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);- 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.
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