/// <summary>
/// Calculates the distance between two geo-points in kilometers using the Haversine algorithm.
/// </summary>
/// <param name="point1">The first point.</param>
/// <param name="point2">The second point.</param>
/// <returns>A double indicating the distance between the points in KM.</returns>
public static double GetDistanceKM(LatLon point1, LatLon point2)
{
double dLat = ToRad(point2.Latitude - point1.Latitude);
double dLon = ToRad(point2.Longtitude - point1.Longtitude);
double a = Math.Pow(Math.Sin(dLat / 2), 2) +
Math.Cos(ToRad(point1.Latitude)) * Math.Cos(ToRad(point2.Latitude)) *
Math.Pow(Math.Sin(dLon / 2), 2);
double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
double distance = EARTH_RADIUS_KM * c;
return distance;
}
