Quasi-Geoid Fitting Based on TwoStep Solution
Gan Yuanfang · 2011
As a quasi-geoid fitting method,the surface fitting based on least squares(LS) estimation has been widely used in the GPS height interpolation.However,if it exists ill-posed problem in surface fitting equation,LS estimate method often can not figure out the stable and accurate solution.A quasi-geoid method based on two-step solution was studied.It can improve the quality of GPS height interpolation though changing the ill-posed equation,and demonstrate the method with an example.