Hwang, Cheinway; Hsu, Hung‑Jui; Featherstone, Will E.; Cheng, Ching‑Chung; Yang, Ming; Huang, Wenhsuan; Wang, Chong‑You; Huang, Jiu‑Fu; Chen, Kwo‑Hwa; Huang, Chi‑Hsun; Chen, Hechin; Su, Wen‑Yi (2018): The gravimetric geoid of Taiwan: TWGEOID18g. V. 1.0. GFZ Data Services. https://doi.org/10.5880/isg.2018.001
Status
I N R E V I E W : Hwang, Cheinway; Hsu, Hung‑Jui; Featherstone, Will E.; Cheng, Ching‑Chung; Yang, Ming; Huang, Wenhsuan; Wang, Chong‑You; Huang, Jiu‑Fu; Chen, Kwo‑Hwa; Huang, Chi‑Hsun; Chen, Hechin; Su, Wen‑Yi (2018): The gravimetric geoid of Taiwan: TWGEOID18g. V. 1.0. GFZ Data Services. https://doi.org/10.5880/isg.2018.001
Abstract
The geoid model for Taiwan, including the Kinmen and Matzu islands, covers the area 118°E–125°E and 21°N–27°N with a grid resolution of 30" x 30". The gravimetric model is based on land, shipborne and airborne gravity data, as well as marine gravity derived from satellite altimetry. After merging data by least-squares collocation, a remove-restore procedure is applied. First height anomalies are computed by 1D FFT with Wong-Gore modification of the Stokes kernel and then they are converted into the geoid heights. The reference global gravity model is EGM2008 up to degree and order 2190. The used digital terrain model is derived from several photogrammetric surveys at a resolution of 3"×3" and 9"×9" for the inner and outer zone, respectively. The gravimetric model fits the GPS/levelling control points with a standard deviation of 7.9 cm (and a mean difference of 21.9 cm).
The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.
Additional Information
The International Service for the Geoid (ISG) was founded in 1992 (as International Geoid Service - IGeS) and it is now an official service of the International Association of Geodesy (IAG), under the umbrella of the International Gravity Field Service (IGFS). The main activities of ISG consist in collecting, analysing and redistributing local and regional geoid models, as well as organizing international schools on the geoid determination (Reguzzoni et al., 2021).
Authors
Hwang, Cheinway;Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Hsu, Hung‑Jui;Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Featherstone, Will E.;School of Earth and Planetary Sciences, Curtin University of Technology, Perth, Australia
Cheng, Ching‑Chung;Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Yang, Ming;Department of Geomatics, National Cheng Kung University, Tainan, Taiwan
Huang, Wenhsuan;Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Wang, Chong‑You;Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Huang, Jiu‑Fu;Department of Land Administration, Ministry of the Interior, Taipei, Taiwan
Chen, Kwo‑Hwa;Department of Real Estate and Built Environment, National Taipei University, New Taipei City, Taiwan
Huang, Chi‑Hsun;Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
Chen, Hechin;National Land Surveying and Mapping Center, Ministry of the Interior, Taichung, Taiwan
Su, Wen‑Yi;Department of Geomatics, National Cheng Kung University, Tainan, Taiwan
Contact
Hwang, Cheinway; Department of Civil Engineering, National Chiao Tung University, Taiwan;
ISG Staff; International Service for the Geoid (ISG); ➦
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The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.
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;Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan
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