/// <summary>
/// Calculate the azimuth in degrees between two locators
/// </summary>
/// <param name="A">Start LatLng structure</param>
/// <param name="B">End LatLng structure</param>
/// <returns>Azimuth in degrees</returns>
public static double Azimuth(LatLng A, LatLng B)
{
if (A.CompareTo(B) == 0)
{
return(0);
}
double hn = DegToRad(A.Lat);
double he = DegToRad(A.Long);
double n = DegToRad(B.Lat);
double e = DegToRad(B.Long);
double co = Math.Cos(he - e) * Math.Cos(hn) * Math.Cos(n) + Math.Sin(hn) * Math.Sin(n);
double ca = Math.Atan(Math.Abs(Math.Sqrt(1 - co * co) / co));
if (co < 0)
{
ca = Math.PI - ca;
}
double si = Math.Sin(e - he) * Math.Cos(n) * Math.Cos(hn);
co = Math.Sin(n) - Math.Sin(hn) * Math.Cos(ca);
double az = Math.Atan(Math.Abs(si / co));
if (co < 0)
{
az = Math.PI - az;
}
if (si < 0)
{
az = -az;
}
if (az < 0)
{
az = az + 2 * Math.PI;
}
return(RadToDeg(az));
}
/// <summary>
/// Calculate the distance in km between two locators
/// </summary>
/// <param name="A">Start LatLng structure</param>
/// <param name="B">End LatLng structure</param>
/// <returns>Distance in km</returns>
public static double Distance(LatLng A, LatLng B)
{
if (A.CompareTo(B) == 0)
{
return(0);
}
double hn = DegToRad(A.Lat);
double he = DegToRad(A.Long);
double n = DegToRad(B.Lat);
double e = DegToRad(B.Long);
double co = Math.Cos(he - e) * Math.Cos(hn) * Math.Cos(n) + Math.Sin(hn) * Math.Sin(n);
double ca = Math.Atan(Math.Abs(Math.Sqrt(1 - co * co) / co));
if (co < 0)
{
ca = Math.PI - ca;
}
double dx = 6367 * ca;
return(dx);
}