Example of tracks recorded from multiple paraglider flights on the same day, read from an IGC file.
The five tracks contain a total of 49,707 unique coordinates. Zoom in to see more detail. The background layer is from OpenCycleMap.
OpenLayers Examples<!DOCTYPE html>
<html>
<head>
<title>IGC Data</title>
<link rel="stylesheet" href="https://openlayers.org/en/v4.6.4/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v4.6.4/build/ol.js"></script>
</head>
<body>
<div id="map" class="map"></div>
<input id="time" type="range" value="0" steps="1" />
<div id="info"> </div>
<script>
var colors = {
'Clement Latour': 'rgba(0, 0, 255, 0.7)',
'Damien de Baesnt': 'rgba(0, 215, 255, 0.7)',
'Sylvain Dhonneur': 'rgba(0, 165, 255, 0.7)',
'Tom Payne': 'rgba(0, 255, 255, 0.7)',
'Ulrich Prinz': 'rgba(0, 215, 255, 0.7)'
};
var styleCache = {};
var styleFunction = function(feature) {
var color = colors[feature.get('PLT')];
var style = styleCache[color];
if (!style) {
style = new ol.style.Style({
stroke: new ol.style.Stroke({
color: color,
width: 3
})
});
styleCache[color] = style;
}
return style;
};
var vectorSource = new ol.source.Vector();
var igcUrls = [
'https://openlayers.org/en/v4.6.4/examples/data/igc/Clement-Latour.igc',
'https://openlayers.org/en/v4.6.4/examples/data/igc/Damien-de-Baenst.igc',
'https://openlayers.org/en/v4.6.4/examples/data/igc/Sylvain-Dhonneur.igc',
'https://openlayers.org/en/v4.6.4/examples/data/igc/Tom-Payne.igc',
'https://openlayers.org/en/v4.6.4/examples/data/igc/Ulrich-Prinz.igc'
];
function get(url, callback) {
var client = new XMLHttpRequest();
client.open('GET', url);
client.onload = function() {
callback(client.responseText);
};
client.send();
}
var igcFormat = new ol.format.IGC();
for (var i = 0; i < igcUrls.length; ++i) {
get(igcUrls[i], function(data) {
var features = igcFormat.readFeatures(data,
{featureProjection: 'EPSG:3857'});
vectorSource.addFeatures(features);
});
}
var time = {
start: Infinity,
stop: -Infinity,
duration: 0
};
vectorSource.on('addfeature', function(event) {
var geometry = event.feature.getGeometry();
time.start = Math.min(time.start, geometry.getFirstCoordinate()[2]);
time.stop = Math.max(time.stop, geometry.getLastCoordinate()[2]);
time.duration = time.stop - time.start;
});
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM({
attributions: [
'All maps © <a href="https://www.opencyclemap.org/">OpenCycleMap</a>',
ol.source.OSM.ATTRIBUTION
],
url: 'https://{a-c}.tile.thunderforest.com/cycle/{z}/{x}/{y}.png' +
'?apikey=Your API key from http://www.thunderforest.com/docs/apikeys/ here'
})
}),
new ol.layer.Vector({
source: vectorSource,
style: styleFunction
})
],
target: 'map',
controls: ol.control.defaults({
attributionOptions: {
collapsible: false
}
}),
view: new ol.View({
center: [703365.7089403362, 5714629.865071137],
zoom: 9
})
});
var point = null;
var line = null;
var displaySnap = function(coordinate) {
var closestFeature = vectorSource.getClosestFeatureToCoordinate(coordinate);
var info = document.getElementById('info');
if (closestFeature === null) {
point = null;
line = null;
info.innerHTML = ' ';
} else {
var geometry = closestFeature.getGeometry();
var closestPoint = geometry.getClosestPoint(coordinate);
if (point === null) {
point = new ol.geom.Point(closestPoint);
} else {
point.setCoordinates(closestPoint);
}
var date = new Date(closestPoint[2] * 1000);
info.innerHTML =
closestFeature.get('PLT') + ' (' + date.toUTCString() + ')';
var coordinates = [coordinate, [closestPoint[0], closestPoint[1]]];
if (line === null) {
line = new ol.geom.LineString(coordinates);
} else {
line.setCoordinates(coordinates);
}
}
map.render();
};
map.on('pointermove', function(evt) {
if (evt.dragging) {
return;
}
var coordinate = map.getEventCoordinate(evt.originalEvent);
displaySnap(coordinate);
});
map.on('click', function(evt) {
displaySnap(evt.coordinate);
});
var stroke = new ol.style.Stroke({
color: 'rgba(255,0,0,0.9)',
width: 1
});
var style = new ol.style.Style({
stroke: stroke,
image: new ol.style.Circle({
radius: 5,
fill: null,
stroke: stroke
})
});
map.on('postcompose', function(evt) {
var vectorContext = evt.vectorContext;
vectorContext.setStyle(style);
if (point !== null) {
vectorContext.drawGeometry(point);
}
if (line !== null) {
vectorContext.drawGeometry(line);
}
});
var featureOverlay = new ol.layer.Vector({
source: new ol.source.Vector(),
map: map,
style: new ol.style.Style({
image: new ol.style.Circle({
radius: 5,
fill: new ol.style.Fill({
color: 'rgba(255,0,0,0.9)'
})
})
})
});
document.getElementById('time').addEventListener('input', function() {
var value = parseInt(this.value, 10) / 100;
var m = time.start + (time.duration * value);
vectorSource.forEachFeature(function(feature) {
var geometry = /** @type {ol.geom.LineString} */ (feature.getGeometry());
var coordinate = geometry.getCoordinateAtM(m, true);
var highlight = feature.get('highlight');
if (highlight === undefined) {
highlight = new ol.Feature(new ol.geom.Point(coordinate));
feature.set('highlight', highlight);
featureOverlay.getSource().addFeature(highlight);
} else {
highlight.getGeometry().setCoordinates(coordinate);
}
});
map.render();
});
</script>
</body>
</html>