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improve distance computation

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vcoppe
2025-11-15 09:05:25 +01:00
parent bd307daa57
commit fc279fecaf
1 changed files with 8 additions and 4 deletions
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12
gpx/src/gpx.ts
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@@ -1935,11 +1935,15 @@ export function distance(
const rad = Math.PI / 180; const rad = Math.PI / 180;
const lat1 = coord1.lat * rad; const lat1 = coord1.lat * rad;
const lat2 = coord2.lat * rad; const lat2 = coord2.lat * rad;
const dLat = lat2 - lat1;
const dLon = (coord2.lon - coord1.lon) * rad;
// Haversine formula - better numerical stability for small distances
const a = const a =
Math.sin(lat1) * Math.sin(lat2) + Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.cos(lat1) * Math.cos(lat2) * Math.cos((coord2.lon - coord1.lon) * rad); Math.cos(lat1) * Math.cos(lat2) * Math.sin(dLon / 2) * Math.sin(dLon / 2);
const maxMeters = earthRadius * Math.acos(Math.min(a, 1)); const c = 2 * Math.asin(Math.sqrt(Math.min(a, 1)));
return maxMeters; return earthRadius * c;
} }
export function getElevationDistanceFunction(statistics: GPXStatistics) { export function getElevationDistanceFunction(statistics: GPXStatistics) {