Two Numerical Approaches to the Direct Geodetie Problem

The direct geodetic problem is a very old one.Bessel method gets its solution through the ellipsoidal integral equation by simple iterative means with no error estimate expression.To overcome the problem mentioned above,this paper proposes two numerical approaches with ther error estimate expressions,which are proved true by actual computations in a DJS 030 computer.When they are used for the direct geodetic problem of long distance,their computational efficiency is better than that of simple iterative means.