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More optimal distance calculation

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This commit is contained in:
Anton Tananaev 2025-06-17 18:48:43 -07:00
parent 52182b15bb
commit 322ca64c82
1 changed files with 3 additions and 2 deletions
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5
lib/geolocation_service.dart
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@ -93,8 +93,9 @@ class GeolocationService {
const earthRadius = 6371008.8; // meters
final dLat = _degToRad(to.coords.latitude - from.latitude);
final dLon = _degToRad(to.coords.longitude - from.longitude);
final a = sin(dLat / 2) * sin(dLat / 2) +
cos(_degToRad(from.latitude)) * cos(_degToRad(to.coords.latitude)) * sin(dLon / 2) * sin(dLon / 2);
final sinLat = sin(dLat / 2);
final sinLon = sin(dLon / 2);
final a = sinLat * sinLat + cos(_degToRad(from.latitude)) * cos(_degToRad(to.coords.latitude)) * sinLon * sinLon;
final c = 2 * atan2(sqrt(a), sqrt(1 - a));
return earthRadius * c;
}