我国1′×1′高程异常模型的建立及应用
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摘要
高精度地确定我国陆海任意点的似大地水准面高(或称高程异常),其基础是先建立相应区域的高精度、高分辨率的高程异常数字模型,然后在此基础上通过内插软件确定.本文阐述了建立我国陆海1′×1′高程异常数字模型的数据、方法和步骤等.分别采用全国854个(一、二级网和A、B级网点)和75个(地震监测站点)高精度GPS/水准点作为外部检核点,对该数字模型进行了精度估计,结果表明:由该数字模型确定全国任意点高程异常的精度,东部地区分别为±0.18 m和±0.13 m,西部地区分别为±0.30 m和±0.22 m,全国总体精度分别为±0.23 m和±0.17 m.比规划的±0.5 m精度指标提高了1倍多.少部分区域达到了厘米级精度.由1′×1′高程异常数字模型及相应软件确定任意点结果的速度一般在2s内.
The foundation for the determination of Quasi-geoid height is to establish the high-resolution and high-accuracy digital model of height anomaly for respective area,and then utilize the interpolation software to determinate it.This paper states the methods and steps for establishing the 1'×1'land and sea digital model of height anomaly in China.The results of precision estimation are achieved through adapting the 854 national high-accuracy GPS/leveling points and 75 points used for seismic monitoring respectively check.The points are: 0.18 m and 0.13 m for the eastern region respectively,0.30 m and 0.22 m for the western region respectively,0.23 m and 0.17 m for the whole country.They are better than the planned precision index: 0.5 m.In some region,the precision is up to cm level.Generally,the determination of the height anomaly on any point can be realized within 2 seconds.
The foundation for the determination of Quasi-geoid height is to establish the high-resolution and high-accuracy digital model of height anomaly for respective area,and then utilize the interpolation software to determinate it.This paper states the methods and steps for establishing the 1'×1'land and sea digital model of height anomaly in China.The results of precision estimation are achieved through adapting the 854 national high-accuracy GPS/leveling points and 75 points used for seismic monitoring respectively check.The points are: 0.18 m and 0.13 m for the eastern region respectively,0.30 m and 0.22 m for the western region respectively,0.23 m and 0.17 m for the whole country.They are better than the planned precision index: 0.5 m.In some region,the precision is up to cm level.Generally,the determination of the height anomaly on any point can be realized within 2 seconds.
引文
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[2]陆仲连.地球重力场的理论与方法[M].北京:解放军出版社,1996.LU Zhong-lian.Theory and method of gravity field of theearth[M].Bijing:The PLA Press,1996.
[3]陈俊勇,李建成,宁津生,等.我国大陆高精度、高分辨率大地水准面的研究和实施[J].测绘学报,2001,(2):95~100.CHEN Jun-yong,LI jian-cheng,et al.On a high resolutingand high accuracy geoid in China mainland[J].Acta Geod etCarto Sinica,2001,(2):95~100.
[4]孙凤华,陈春旺,孔维兵,徐新强,方明,曾安敏.我国陆海1′×1′平均重力异常数字模型的建立及可靠性检验[M].地面网与空间网联合平差论文集(四).北京:解放军出版社,2003.190~196.SUN Feng-hua,et al.The establishment and reliability inspec-tion of digital model of 1′×1′mean gravity anomaly in ourcountry’s land and sea[M].Combined adjustment of astro-ge-odetic and space-geodetic networks(4).Beijing:PLA Press,2003.190~196.
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