基于EGM2008模型进行芜湖市似大地水准面精化

利用高精度的GPS水准数据、重力数据、数字地形模型和EGM2008地球重力场模型，采用移去一恢复技术进行芜湖市1400km2似大地水准面精化。分别采用芜湖市坐标转换重合点，利用二维高斯平面坐标转换模型，建立了芜湖市2000国家大地坐标系与1980西安坐标系、1954年北京坐标系及芜湖独立坐标系的坐标转换模型，并且新建了芜湖2000独立坐标系。综合利用多种现代拟合方法完成了分辨率为2．5′×2．5′，高精度、高分辨率的芜湖市似大地水准面模型的计算，模型拟合精度达到±1．1cm，外部检核精度达到±1．3cm。

Quasi-Geoid Refinement Based on the EMG2008 Model of Wuhu City

This paper discuss about using high-precision GPS leveling data, gravity data, digital terrain models, EGM 2005 Earth gravity field model and removed-recovery techniques in 1400 square kilometers quasi-geoid refinement of Wuhu City. We use coordinates coincident points of Wuhu city and two-dimensional Gaussian plane coordinate transfor- mation model to establish coordinate transformation model of geodetic coordinate system of Wuhu City 2000, Xi＇an Coor- dinate System 1980 ,Beijing coordinate system 1954 and Wuhu independent coordinate system respectively. We compre- hensive utilize a variety of modern fitting method to complete the high-precision, high-resolution quasi-geoid refinement of Wuhu city calculation with the complete resolution of 2.5′×2.5′, model fitting accuracy of± 1.1 cm external checking accuracy ±1.3cm.