说明：  实现经纬度坐标与直角坐标之间的相互转换，以及角度不同表示方法法的转换（弧度、度、度分、度分秒等）。，
(Mutual conversion between the latitude and longitude coordinates and rectangular coordinates, and a different angle, said method method of conversion (radians, degrees, degrees minutes degrees minutes and seconds, etc.). ,)