EXPERIMENTS WITH TWO DIFFERENT APPROACHES TO GRIDDING TERRESTRIAL GRAVITY ANOMALIES AND THEIR EFFECT ON REGIONAL GEOID COMPUTATION
EXPERIMENTS WITH TWO DIFFERENT APPROACHES TO GRIDDING TERRESTRIAL GRAVITY ANOMALIES AND THEIR EFFECT ON REGIONAL GEOID COMPUTATION
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DOI：
10.1179/sre.2003.37.288.92
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发表时间：
2003-04
期刊：
影响因子：
1.6
通讯作者：
J. Goos;W. Featherstone;J. Kirby;S. Holmes
中科院分区：
文献类型：
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作者：
J. Goos;W. Featherstone;J. Kirby;S. Holmes
摘要本文比较了澳大利亚区域重力大地水准面模型计算前两类重力异常的网格划分。目的是调查高频分量（通过地形校正）对平均重力异常网格的影响，从而对大地水准面产生影响。研究的重力异常类型包括简单布格异常和精细布格异常，两者都使用恒定的地形质量密度计算。无论哪种异常类型用于网格化，都应用相关的附加校正项以产生平均赫尔默特异常的近似值。区域重力大地水准面模型，然后在澳大利亚计算和相互比较，并与澳大利亚高程基准GPS水准点。这表明，在重力网格化之前或之后应用地形校正对澳大利亚计算的大地水准面只有相对较小的影响。
Abstract This paper compares the gridding of two types of terrestrial gravity anomaly prior to the computation of regional gravimetric geoid models over Australia. The aim is to investigate the effects of high-frequency components (by way of the terrain correction) on the resulting grid of mean gravity anomalies, and hence the geoid. The gravity anomaly types investigated comprise simple Bouguer anomalies and refined Bouguer anomalies, both computed using a constant topographic mass density. Irrespective of which anomaly type is used for gridding, the relevant additional correction terms are applied to yield an approximation of the mean Helmert anomaly. Regional gravimetric geoid models are then computed over Australia and compared with one another and with GPS-levelling points on the Australian Height Datum. This shows that the application of terrain corrections before or after gravity gridding has only a relatively small effect on the computed geoid in Australia.