2026-06-12T18:42:36Zhttp://doidb.wdc-terra.org/oaip/oai

oai:doidb.wdc-terra.org:81022025-03-12T16:09:23ZDOIDBDOIDB.ISG

false4DOIDB.ISG 10.5880/isg.2021.011 Wu, Yihao Yihao Wu 0000-0001-8026-6105 School of Earth Sciences and Engineering, Hohai University, Nanjing, China Abulaitijiang, Adili Adili Abulaitijiang 0000-0003-1449-2301 Institute of Geodesy andGeoinformation, University of Bonn, Bonn, Germany Andersen, Ole Baltazar Ole Baltazar Andersen 0000-0002-6685-3415 DTU Space, Technical University of Denmark, Lyngby,Denmark He, Xiufeng Xiufeng He 0000-0002-5262-1007 School of Earth Sciences and Engineering, Hohai University, Nanjing, China Luo, Zhicai Zhicai Luo 0000-0002-5824-0280 School of Physics, HuazhongUniversity of Science and Technology, Wuhan, China Wang, Haihong Haihong Wang 0000-0002-0106-8360 School of Geodesy and Geomatics, Wuhan University, Wuhan,China GFZ Data Services 2021 Geodesy Geoid model ISG Spherical radial basis functions Poisson wavelets Paracel Islands EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY Wu, Yihao Yihao Wu 0000-0001-8026-6105 School of Earth Sciences and Engineering, Hohai University, Nanjing, China Reguzzoni, Mirko Mirko Reguzzoni 0000-0002-4027-9347 International Service for the Geoid (ISG), Politecnico di Milano, Italy Carrion, Daniela Daniela Carrion 0000-0003-1262-9394 International Service for the Geoid (ISG), Politecnico di Milano, Italy Rossi, Lorenzo Lorenzo Rossi 0000-0001-6050-1972 International Service for the Geoid (ISG), Politecnico di Milano, Italy ISG Staff International Service for the Geoid (ISG) Wu, Yihao School of Earth Sciences and Engineering, Hohai University, Nanjing, China ISG Staff International Service for the Geoid (ISG) 2021 Dataset 10.1029/2021JB021805 10.1007/s00190-007-0196-3 10.5194/essd-13-1653-2021 http://www.isgeoid.polimi.it/ 1.0 CC BY 4.0 PIGEOID2021 is a purely gravimetric quasi-geoid model covering the whole Paracel Islands in the northwestern South China Sea. The quasi-geoid is referred to the GRS80 ellipsoid and extends from 15.27°N to 18.23°N and from 110.59°E to 113.30°E with a grid spacing of 30" in both the latitudinal and longitudinal directions. PIGEOID2021 is computed using localised airborne gravity anomalies (with an accuracy of 1.44 mGal at a resolution of 3 km) under the framework of the remove-compute-restore method, where XGM2019e_2159 (truncated to d/o 1080) is used as the reference model and the residual terrain model is applied for smoothing local gravity field at very short scales (< 3 km). The residual gravity field is parameterized using Poisson wavelets by assuming white noise of observations. Comparisons with altimeter-derived geometric quasi-geoid heights retrieved from Jason-2, CryoSat-2, and SARAL show the misfits of PIGEOID2021 are within 5 cm. Further analysis shows PIGEOID2021 reduces the bubble-like errors over island areas by a magnitude exceeding 6 cm compared to existing global geopotential models.

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.
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.
Gravimetric quasi-geoid model 110.588 113.296 15.2708 18.2292