利用重力资料确定香港各地区的高度

IF 1.2 Q4 REMOTE SENSING
Albertini Nsiah Ababio, R. Tenzer
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引用次数: 4

摘要

摘要香港主基准(HKPD)是香港地区目前采用的官方大地测量垂直基准。事实上,香港生产力发展是通过水准水准的高度来实现的。然而,HKPD的高度既不是正常的,也不是正交的。原因是水准基准的高度是通过精确的水准测量确定的,但不涉及沿水准线的重力观测。为了减少由于忽略水准线上的重力信息而产生的系统误差,我们使用陆地和海洋重力数据对水准基准处的重力值进行插值,以便计算并将正交校正应用于测量的水准高差。我们的研究结果表明,即使对于相对较小的区域,也要结合重力信息,但其特征是地形粗糙,水准基准高度超过数百米。根据我们的估计,正交校正达到(甚至略高于)±2 厘米,最大值沿着穿过山脉的水准线。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The use of gravity data to determine orthometric heights at the Hong Kong territories
Abstract The Hong Kong Principal Datum (HKPD) is the currently adopted official geodetic vertical datum at the Hong Kong territories. The HKPD is practically realized by heights of levelling benchmarks. The HKPD heights are, however, neither normal nor orthometric. The reason is that heights of levelling benchmarks were determined from precise levelling measurements, but without involving gravity observations along levelling lines. To reduce systematic errors due to disregarding the gravity information along levelling lines, we used terrestrial and marine gravity data to interpolate gravity values at levelling benchmarks in order to compute and apply the orthometric correction to measured levelling height differences. Our results demonstrate the importance of incorporating the gravity information even for a relatively small region but characterized by a rough topography with heights of levelling benchmarks exceeding several hundreds of meters. According to our estimates, the orthometric correction reaches (and even slightly exceeds) ±2 cm, with maxima along levelling lines crossing mountain chains.
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来源期刊
Journal of Applied Geodesy
Journal of Applied Geodesy REMOTE SENSING-
CiteScore
2.30
自引率
7.10%
发文量
30
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