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Fix ground track line crossing antimeridian

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Split pass ground track at 180° longitude crossings to prevent
lines being drawn across the entire map.
This commit is contained in:
James Smith
2025-12-29 22:09:59 +00:00
parent 3e09140b0a
commit ec988dd35b
1 changed files with 32 additions and 7 deletions
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templates/satellite_dashboard.html
+32 -7
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@@ -1165,14 +1165,39 @@
if (orbitTrack) groundMap.removeLayer(orbitTrack);
if (pass && pass.groundTrack) {
const coords = pass.groundTrack.map(pt => [pt.lat, pt.lon]);
// Split track at antimeridian crossings to avoid lines across map
const segments = [];
let currentSegment = [];
trackLine = L.polyline(coords, {
color: pass.color || '#00d4ff',
weight: 3,
opacity: 0.8,
dashArray: '10, 5'
}).addTo(groundMap);
for (let i = 0; i < pass.groundTrack.length; i++) {
const p = pass.groundTrack[i];
if (currentSegment.length > 0) {
const prevLon = currentSegment[currentSegment.length - 1][1];
// If longitude jumps more than 180°, start new segment
if (Math.abs(p.lon - prevLon) > 180) {
if (currentSegment.length > 1) {
segments.push(currentSegment);
}
currentSegment = [];
}
}
currentSegment.push([p.lat, p.lon]);
}
if (currentSegment.length > 1) {
segments.push(currentSegment);
}
// Draw each segment as separate polyline
trackLine = L.layerGroup();
segments.forEach(seg => {
L.polyline(seg, {
color: pass.color || '#00d4ff',
weight: 3,
opacity: 0.8,
dashArray: '10, 5'
}).addTo(trackLine);
});
trackLine.addTo(groundMap);
// Current position marker
if (pass.currentPos) {