/// <summary>
/// 已知点A经纬度，根据B点据A点的距离，和方位，求B点的经纬度
/// </summary>
/// <param name="longitude">已知点A经度</param>
/// <param name="latitude">已知点A纬度</param>
/// <param name="distance">B点到A点的距离</param>
/// <param name="angle">B点相对于A点的方位，12点钟方向为零度，角度顺时针增加</param>
/// <returns>B点的经纬度坐标</returns>
public static LatLon GetLatLon(double longitude, double latitude, double distance, double angle)
{
LatLon a = new LatLon(latitude, longitude);
return(GetLatLon(a, distance, angle));
}