Empirical comparison between stochastic and deterministic modifiers over the French Auvergne geoid computation test-bed
Empirical comparison between stochastic and deterministic modifiers over the French Auvergne geoid computation test-bed
复制标题
法国奥弗涅大地水准面计算试验台随机与确定性修正量的实证比较
DOI：
10.1080/00396265.2021.1871821
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发表时间：
2021
期刊：
影响因子：
1.6
通讯作者：
N. Balasubramanian
中科院分区：
文献类型：
--
作者：
R. Goyal;J. Ågren;W. Featherstone;L. Sjöberg;O. Dikshit;N. Balasubramanian
自2006年以来，几个不同的小组使用各种方法计算了法国中部奥弗涅试验区的大地水准面和/或准大地水准面（准/大地水准面）模型。在这方面的贡献，我们使用科廷理工大学和瑞典皇家理工学院的方法计算和比较奥弗涅准大地模型。这些方法在许多方面有所不同，例如它们对输入数据的处理，球谐模型类型的选择（组合或仅卫星），应用的校正项的形式和顺序，以及不同的修改后的斯托克斯核（确定性或随机性）。我们还将我们的结果与以前报道的大多数奥弗涅研究进行了比较，以寻求时间方面的任何改进[例外情况是使用了不同的数据子集]。这里考虑的所有研究比较计算的准大地水准面模型与相同的75 GPS水准高度在奥弗涅。几乎所有计算（没有任何拟合）的标准偏差都在30-40 mm的量级，因此还没有任何明确的迹象表明任何方法是否一定比任何其他方法更好，也没有随着时间的推移而改进。 我们还建议在用GPS水准测量数据进行准大地水准面比较时更加标准化，以便能够更客观地比较同一地区不同方法的结果。
Since 2006, several different groups have computed geoid and/or quasigeoid (quasi/geoid) models for the Auvergne test area in central France using various approaches. In this contribution, we compute and compare quasigeoid models for Auvergne using Curtin University of Technology’s and the Swedish Royal Institute of Technology’s approaches. These approaches differ in many ways, such as their treatment of the input data, choice of type of spherical harmonic model (combined or satellite-only), form and sequence of correction terms applied, and different modified Stokes’s kernels (deterministic or stochastic). We have also compared our results with most of the previously reported studies over Auvergne in order to seek any improvements with respect to time [exceptions are when different subsets of data have been used]. All studies considered here compare the computed quasigeoid models with the same 75 GPS-levelling heights over Auvergne. The standard deviation for almost all of the computations (without any fitting) is of the order of 30–40 mm, so there is not yet any clear indication whether any approach is necessarily better than any other nor improving over time. We also recommend more standardisation on the presentation of quasi/geoid comparisons with GPS-levelling data so that results from different approaches over the same areas can be compared more objectively.
影响因子：
4.4
作者：
Qing Liu;M. Schmidt;L. Sánchez;M. Willberg
通讯作者：
Qing Liu;M. Schmidt;L. Sánchez;M. Willberg
影响因子：
2.3
作者：
Miao Lin;H. Denker;Jürgen Müller
通讯作者：
Miao Lin;H. Denker;Jürgen Müller