【摘要】 利用近7万个湖南及邻近省份重力观测数据、502个GNSS/水准控制点及数字高程模型,以EIGEN-6C4全球重力场模型作参考重力场,采用顾及地球曲率影响的各类地形质量位及引力的第二类Helmert凝集法严密算法,利用高分辨率地形数据恢复甚短波扰动重力场,确定空间分辨率2′×2′的高精度湖南省似大地水准面模型(HNGG2017)。经外部检核,模型整体精度均优于±0.022m。与历史模型相比,新模型在湖南北部常德汉寿、西南部永州江永等地区精度得到显著改善。更多还原

【Abstract】 Using nearly 70 000 gravity observation data,SRTM topographic data and GNSS/leveling control points data from Hunan and nearby districts,the EIGEN-6C4 global gravity fields model is taken to be the reference gravity field.And the Stokes-Helmert approach and spherical cap harmonic analysis are conducted to construct the 2′×2′resolution Hunan GNSS gravity geoid model(HNGG2017).The precision test shows that the external error range is±0.022 m.Compared to the historic model,the error of the new model in north areas such as Changde Hanshou and southwest areas such as Yongzhou Jiangyong are significantly reduced.更多还原