public PointLatLngAlt(PointLatLngAlt plla)
{
this.Lat = plla.Lat;
this.Lng = plla.Lng;
this.Alt = plla.Alt;
this.color = plla.color;
this.Tag = plla.Tag;
}
/// <summary>
/// Calc Distance in M
/// </summary>
/// <param name="p2"></param>
/// <returns>Distance in M</returns>
public double GetDistance(PointLatLngAlt p2)
{
double d = Lat * 0.017453292519943295;
double num2 = Lng * 0.017453292519943295;
double num3 = p2.Lat * 0.017453292519943295;
double num4 = p2.Lng * 0.017453292519943295;
double num5 = num4 - num2;
double num6 = num3 - d;
double num7 = Math.Pow(Math.Sin(num6 / 2.0), 2.0) + ((Math.Cos(d) * Math.Cos(num3)) * Math.Pow(Math.Sin(num5 / 2.0), 2.0));
double num8 = 2.0 * Math.Atan2(Math.Sqrt(num7), Math.Sqrt(1.0 - num7));
return (6378.137 * num8) * 1000; // M
}