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Application of MATLAB Surface Fitting Tool for GNSS height transformation
Author(s): 
Pages: 65-68
Year: Issue:  9
Journal: Geotechnical Investigation & Surveying

Keyword:  MATLAB Surface Fitting ToolGNSSheight transformationaccuracy analysis;
Abstract: The normal height measurement can be implemented rapidly by the GNSS surveying.However,some fitting functions or a regional quasi-geoid model is necessary for transforming the ellipsoidal height to the normal height.Surface Fitting Tool which comes with the MATLAB software is a powerful surface fitting toolbox.This toolbox contains a wealth of fitting functions for GNSS height transformation.In this paper,Surface Fitting Tool is used for the height transformation with GNSS /Leveling data and the accuracy by various fitting functions was discussed.The result shows that most fitting functions of Surface Fitting Tool can achieve cm level accuracy for GNSS height transformation in the flat test area,except the nearest neighbor interpolation.The accuracy of quadratic polynomial model can be better than 3cm while in the same condition.The toolbox can improve the work efficiency without writing programs of the complex fitting function.
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