지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
After launching the GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) which obtains high-frequency gravity signal using a gravity gradiometer, many research institutes are concentrating on the development of GGM (Global Geopotential Model) based on GOCE data and evaluating its precision. The precision of some GGMs was also evaluated in Korea. However, some studies dealt with GGMs constructed based on initial GOCE data or others applied a part of GNSS (Global Navigation Satellite System) / Leveling data on UCPs (Unified Control Points) for the precision evaluation. Now, GGMs which have a higher degree than EGM2008 (Earth Gravitational Model 2008) are available and UCPs were fully established at the end of 2019. Thus, EIGEN-6C4 (European Improved Gravity Field of the Earth by New techniques – 6C4), GECO (GOCE and EGM2008 Combined model), XGM2016 (Experimental Gravity Field Model 2016), SGG-UGM-1, XGM2019e_2159 were collected with EGM2008, and their precisions were assessed based on the GNSS/Leveling data on UCPs. Among GGMs, it was found that XGM2019e_2159 showed the minimum difference compared to a total of 5,313 points of GNSS/Leveling data. It is about a 1.5cm and 0.6cm level of improvement compare to EGM2008 and EIGEN-6C4. Especially, the local biases in the northern part of Gyeonggi-do, Jeju island shown in the EGM2008 was removed, so that both mean and standard deviation of the difference of XGM2019e_2159 to the GNSS/Leveling are homogeneous regardless of region (mountainous or plain area). NGA (National Geospatial-Intelligence Agency) is currently in progress in developing EGM2020 and XGM2019e_2159 is the experimentally published model of EGM2020. Therefore, it is expected that the improved GGM will be available shortly so that it is necessary to verify the precision of new GGMs consistently.
목차
Abstract
1. Introduction
2. Global Geopotential Model
3. Precision Evaluation
4. Conclusion
References
참고문헌 (30)
참고문헌 신청
Abd-Elmotaal, H.A. (2015), Validation of GOCE models in Africa, Newton’s Bull, Vol. 5, pp. 149-162.
Bae, T.S., Lee, J., Kwon, J.H., and Hong, C.K. (2012), Update of the precision geoid determination in Korea, Geophysical prospecting, Vol. 60, No. 3, pp. 555-571.
Baek, K.M., Kwon, J.H., and Lee, J. (2013), Precision verification of new global gravitational model using GPS/ leveling data, Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, Vol. 31, No. 3, pp. 239-247. (in Korean with English abstract)
Barthelmes, F. (2014), Global Models, Encyclopedia of Geodesy, Springer International Publishing, Cham, Switzerland.
Barthelmes, F. and Kohler, W. (2013), ICGEM?status of the IAG service for global Earth gravity field models after the first decade, The IAG Scientific Assembly 2013, 150th Anniversary of the IAG (Potsdam 2013), 1-6 September, Potsdam, Germany.
Bae, T.S., Lee, J., Kwon, J.H., and Hong, C.K. (2012), Update of the precision geoid determination in Korea, Geophysical prospecting, Vol. 60, No. 3, pp. 555-571.
Baek, K.M., Kwon, J.H., and Lee, J. (2013), Precision verification of new global gravitational model using GPS/ leveling data, Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography, Vol. 31, No. 3, pp. 239-247. (in Korean with English abstract)
Barthelmes, F. (2014), Global Models, Encyclopedia of Geodesy, Springer International Publishing, Cham, Switzerland.
Barthelmes, F. and Kohler, W. (2013), ICGEM?status of the IAG service for global Earth gravity field models after the first decade, The IAG Scientific Assembly 2013, 150th Anniversary of the IAG (Potsdam 2013), 1-6 September, Potsdam, Germany.
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UCI(KEPA) : I410-ECN-0101-2020-533-000586654