GPS-GRAVIMETRIC GEOID DETERMINATION IN EGYPT

作     者：Essam Ghanem 

作者机构：GPS Center Wuhan University Wuhan China 

出 版 物：《Geo-Spatial Information Science》 (地球空间信息科学学报（英文）)

年 卷 期：2001年第4卷第1期

页      面：19-23页

学科分类：08[工学] 081601[工学-大地测量学与测量工程] 0816[工学-测绘科学与技术] 

主　　题：gravimetric geoid GPS/leveling data fitting 

摘      要：The main objective of this study is to improve the geoid by GPS/leveling data in *** of the gravimetric geoid with GPS/leveling data have been *** the basis of a gravimetric geoid fitted to GPS/leveling by the least square method,a smoothed geoid was obtained.A high_resolution geoid in Egypt was computed with a 2.5′×2.5′ grid by combining the data set of 2 600 original point gravity values,30″×30″ resolution Digital Terrain Model (DTM) grid and the spherical harmonic model *** method of computation involved the strict evaluation of the Stokes integral with 1D_*** standard deviation of the difference between the gravimetric and the GPS/leveling geoid heights is ±0.47 *** standard deviation after fitting of the gravimetric geoid to the GPS/leveling points is better than ±13 *** the future we will try to improve our geoid results in Egypt by increasing the density of gravimetric coverage.