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ABSTRACT
This study attempts to develop a methodology to construct a high-precision geoid model (HKGEOID-2016) over Hong Kong. To achieve this objective, a hybrid method is employed in this article. The proposed method involves three steps: the combination of multisource data; the construction of gravimetric geoid model using the remove-restore technique and Molodensky's theory; and the optimal combination of heterogeneous height data, improved by the evaluation of stochastic models through the variance component estimation method and assessment of the parametric model. The accuracy of the constructed geoid is evaluated with independent GNSS/leveling data. Numerical results indicate that external precision of 1.5 cm level is achievable. Furthermore, compared with the former geoid model HKGEOID-2000, the proposed procedure in this study improves the accuracy of the geoid significantly.
Acknowledgments
The Hong Kong local geoid HKGEOID-2000 and GNSS/leveling data were provided by the Department of Land Surveying and Geo-Informatics and the Hong Kong Polytechnic University.
Funding
This work was sponsored by the National Natural Science Foundation of China (No. 41504012) and State Key Laboratory of Geo-information Engineering (No. SKLGIE2015-M-1-5).