引用本文: 李建成, 宁津生, 陈俊勇, 罗志才. 我国海域大地水准面与大陆大地水准面的拼接研究[J]. 武汉大学学报 ( 信息科学版), 2003, 28(5): 542-546.
LI Jiancheng, NING Jinshen, CHEN Junyong, LUO Zhicai. Problem of Piecing Together Between China Mainland-Geoid and Altimetry-Derived Geoid in China Sea Area[J]. Geomatics and Information Science of Wuhan University, 2003, 28(5): 542-546.
 Citation: LI Jiancheng, NING Jinshen, CHEN Junyong, LUO Zhicai. Problem of Piecing Together Between China Mainland-Geoid and Altimetry-Derived Geoid in China Sea Area[J]. Geomatics and Information Science of Wuhan University, 2003, 28(5): 542-546.

## Problem of Piecing Together Between China Mainland-Geoid and Altimetry-Derived Geoid in China Sea Area

• 摘要: 由重力和GPS水准数据确定的陆地大地水准面和主要由卫星测高数据确定的海洋大地水准面,两者之间一般都存在以系统误差为主的拼接差,分析了产生这一现象的主要原因。顾及这一现象,并结合我国在陆海大地水准面拼接区重力资料稀疏的实际,提出了扩展拼接技术。以国家GPS水准网确定的(似)大地水准面作控制,对陆海重力大地水准面作拟合校正,得到我国校正的陆海统一的重力大地水准面。

Abstract: There exists the discontinuity in coast area between continental geoid and marine geoid determined from terrestrial grarity data and altimeter data,respectively,which is mainly due to systematic errors in the two kinds of geoids.In this paper,the possible main causes of the errors are analyzed in brief.Considering the reality that there is lack of gravity data in China coast area,an extending method is advanced for piecing the two types of geoids determined by different principles and data sets.The main idea of this method is:①the terrestrial gravity anomaly data and marine altimetry-derived ones are combined as a whole which is a unified 5'×5' gridded data set,and the continental gravity geoid is extended to the sea area using Stokes formula and the data set;② the marine geoid directly determined only from altimeter data,i.e.altimetry-derived geoid,is fitted with the above continental gravity geoid,and the altimetryderived geoid will be corrected using the fitting function.The piecing together is accomplished in this step,and the continental gravity geoid is fixed in the process of piecing together;③the continent-marine gravity geoid after piecing together is then fitted with(quasi)-geoid determined by National GPS leveling network,and the corrected gravity geoid is obtained.Moreover,the systematic errors in the two types of geoid are estimated using the discrepancies between the continent-marine gravity geoid and the altimetry-only-derived geoid at corresponding points.

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