10.5880/isg.2018.001 eng dataset GFZ German Research Centre for Geosciences datapub@gfz-potsdam.de http://www.gfz-potsdam.de Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences pointOfContact 2021-04-21 urn:ogc:def:crs:EPSG:4326 The gravimetric geoid of Taiwan: TWGEOID18g 2021-04-21 revision 2018 creation doi:10.5880/isg.2018.001 Hwang, Cheinway Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan author Hsu, Hung‑Jui Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan author Featherstone, Will E. School of Earth and Planetary Sciences, Curtin University of Technology, Perth, Australia author Cheng, Ching‑Chung Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan author Yang, Ming Department of Geomatics, National Cheng Kung University, Tainan, Taiwan author Huang, Wenhsuan Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan author Wang, Chong‑You Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan author Huang, Jiu‑Fu Department of Land Administration, Ministry of the Interior, Taipei, Taiwan author Chen, Kwo‑Hwa Department of Real Estate and Built Environment, National Taipei University, New Taipei City, Taiwan author Huang, Chi‑Hsun Department of Civil Engineering, National Chiao Tung University, Hsinchu, Taiwan author Chen, Hechin National Land Surveying and Mapping Center, Ministry of the Interior, Taichung, Taiwan author Su, Wen‑Yi Department of Geomatics, National Cheng Kung University, Tainan, Taiwan author GFZ Data Services publisher 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. Hwang, Cheinway Department of Civil Engineering, National Chiao Tung University, Taiwan cheinway@nctu.edu.tw pointOfContact ISG Staff International Service for the Geoid (ISG) isg@polimi.it http://www.isgeoid.polimi.it/ informtion pointOfContact Geodesy Geoid model ISG Fast Fourier Transform Wong-Gore Stokes kernel modification Taiwan EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY NASA/GCMD Earth Science Keywords publication CC BY 4.0 CC BY 4.0 10.1007/s00190-020-01412-5 DOI IsDocumentedBy http://www.isgeoid.polimi.it/Geoid/format_specs.html URL IsDocumentedBy 10.1007/s00190-020-01434-z DOI References http://www.isgeoid.polimi.it/ URL References 10.5880/isg.2018.002 DOI IsVariantFormOf 10.5194/essd-13-1653-2021 DOI References eng geoscientificInformation Gravimetric geoid model TWGEOID18g 118 125 21 27 http://doi.org/10.5880/isg.2018.001 WWW:LINK-1.0-http--link Data Access - DOI Data Access - DOI information