Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/64832
Title: High-resolution regional gravity field recovery from Poisson wavelets using heterogeneous observational techniques 6. Geodesy
Authors: Wu, Y
Luo, Z
Chen, W 
Chen, Y 
Keywords: GPS/leveling data
Poisson wavelets
Quasi-geoid/geoid
Regional gravity field recovery
Tikhonov regularization
Issue Date: 2017
Publisher: Springer
Source: Earth, planets and space, 2017, v. 69, no. 1 How to cite?
Journal: Earth, planets and space 
Abstract: We adopt Poisson wavelets for regional gravity field recovery using data acquired from various observational techniques; the method combines data of different spatial resolutions and coverage, and various spectral contents and noise levels. For managing the ill-conditioned system, the performances of the zero- and first-order Tikhonov regularization approaches are investigated. Moreover, a direct approach is proposed to properly combine Global Positioning System (GPS)/leveling data with the gravimetric quasi-geoid/geoid, where GPS/leveling data are treated as an additional observation group to form a new functional model. In this manner, the quasi-geoid/geoid that fits the local leveling system can be computed in one step, and no post-processing (e.g., corrector surface or least squares collocation) procedures are needed. As a case study, we model a new reference surface over Hong Kong. The results show solutions with first-order regularization are better than those obtained from zero-order regularization, which indicates the former may be more preferable for regional gravity field modeling. The numerical results also demonstrate the gravimetric quasi-geoid/geoid and GPS/leveling data can be combined properly using this direct approach, where no systematic errors exist between these two data sets. A comparison with 61 independent GPS/leveling points shows the accuracy of the new geoid, HKGEOID-2016, is around 1.1 cm. Further evaluation demonstrates the new geoid has improved significantly compared to the original model, HKGEOID-2000, and the standard deviation for the differences between the observed and computed geoidal heights at all GPS/leveling points is reduced from 2.4 to 0.6 cm. Finally, we conclude HKGEOID-2016 can be substituted for HKGEOID-2000 for engineering purposes and geophysical investigations in Hong Kong. [Figure not available: see fulltext.]
URI: http://hdl.handle.net/10397/64832
ISSN: 1343-8832 (print)
1880-5981 (online)
EISSN: 1880-5981
DOI: 10.1186/s40623-017-0618-2
Rights: © The Author(s) 2017.
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License(http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
This article Wu, Y., Luo, Z., Chen, W., & Chen, Y. (2017). High-resolution regional gravity field recovery from Poisson wavelets using heterogeneous observational techniques. Earth, Planets and Space, 69(1), 34 is available at https://doi.org/10.1186/s40623-017-0618-2
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