A DIRECT TRANSFORMATION FROM GEOCENTRIC CARTESIAN TO GEODETIC COORDINATES
一种由地心直角坐标到大地坐标的直接转换

On the basis of the analysis of the geometric relation between the geodetic and geocentric coordinates,a tangent quartic equation of geodetic latitude is established and thus the geodetic latitude can be solved directly.The algorithm for solving the quartic equation is simple.The calculated results indicate that the method is better than the existent iterative methods and the direct transformation method in calculating accuracy and efficiency.