38 lines
1.1 KiB
TypeScript
38 lines
1.1 KiB
TypeScript
export function calculateBearing(
|
|
lat1: number,
|
|
lon1: number,
|
|
lat2: number,
|
|
lon2: number
|
|
): number {
|
|
const φ1 = (lat1 * Math.PI) / 180; // Convert to radians
|
|
const φ2 = (lat2 * Math.PI) / 180;
|
|
const Δλ = ((lon2 - lon1) * Math.PI) / 180;
|
|
|
|
// Bearing formula
|
|
const y = Math.sin(Δλ) * Math.cos(φ2);
|
|
const x =
|
|
Math.cos(φ1) * Math.sin(φ2) - Math.sin(φ1) * Math.cos(φ2) * Math.cos(Δλ);
|
|
let θ = Math.atan2(y, x);
|
|
θ = (θ * 180) / Math.PI; // Convert back to degrees
|
|
return (θ + 360) % 360; // Normalize to 0-360°
|
|
}
|
|
|
|
export function calculateDistance(
|
|
lat1: number,
|
|
lon1: number,
|
|
lat2: number,
|
|
lon2: number
|
|
): number {
|
|
const R = 6371e3; // Earth radius in meters
|
|
const φ1 = (lat1 * Math.PI) / 180;
|
|
const φ2 = (lat2 * Math.PI) / 180;
|
|
const Δφ = ((lat2 - lat1) * Math.PI) / 180;
|
|
const Δλ = ((lon2 - lon1) * Math.PI) / 180;
|
|
|
|
const a =
|
|
Math.sin(Δφ / 2) * Math.sin(Δφ / 2) +
|
|
Math.cos(φ1) * Math.cos(φ2) * Math.sin(Δλ / 2) * Math.sin(Δλ / 2);
|
|
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
|
|
return R * c; // Distance in meters
|
|
}
|