中文摘要：

利用GNSS技术可实现区域快速正常高测量,但一般需要借助拟合方法或区域似大地水准面模型将GNSS获得的大地高转换为正常高,Surface Fitting Tool是MATLAB软件附带的拟合工具箱,该工具箱具有丰富的拟合函数,可用于GNSS高程转换。本文利用某测区实测GNSS/水准数据探讨Surface Fitting Tool拟合工具箱的各种拟合函数用于GNSS高程转换的精度。实验结果表明,在地形较为平坦的测区,除最邻近拟合函数外,其余函数的拟合精度基本可达厘米级,在相同的条件下,二次曲面拟合最高时可优于3cm,利用该工具箱无需编写复杂的拟合程序,提高了工作效率。

英文摘要：

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.