Comparison of methods to transition geodetic latitude
(1.Department of Surveying Enineering, Liaoning Technical University, Fuxin, 123000, China2.Liaoning Technical University, Fuxin 123000, China)
Abstract: With the wide application of GPS technology, the application of the system of space rectangular coordinates is more and more extensive. Transformation of space rectangular coordinates into geodetic coordinates becomes a very popular problem. In order to evaluate various kinds of algorithms existing for solving the problem, three evaluation criteria of the algorithm were put forward at first, that is, precision, calculation speed and algorithm regional suitability. After given some basic formula, three kinds of representative algorithms, classics iteration algorithm, ellipsoidal parameter transformation algorithm and rational polynomials approximation algorithm were introduced. Through a test program made by MATLAB, these three kinds of algorithms were compared. Some helpful conclusions were drawn.
Key words: geodetic latitude； numerical method； coordinate transition； geodetic coordinates； rectangular coordinates