/// <summary>
/// Computes the aproximate distance between to geographic points
/// </summary>
/// <returns>Distance in KM</returns>
public static double DistanceFrom(GeoPoint from, GeoPoint to)
{
const int r = 6371; // Radius of the earth in km
var a = 0.5 - Math.Cos((to.Latitude - from.Latitude) * Math.PI / 180) / 2 +
Math.Cos(from.Latitude * Math.PI / 180) * Math.Cos(to.Latitude * Math.PI / 180) *
(1 - Math.Cos((to.Longitude - from.Longitude) * Math.PI / 180)) / 2;
return r * 2 * Math.Asin(Math.Sqrt(a));
}
/// <summary> /// Computes the aproximate distance between to geographic points /// </summary> /// <returns>Distance in KM</returns> public double DistanceFrom(GeoPoint destination) => DistanceFrom(this, destination);