Results 11 to 20 of about 1,044,226 (312)
Global Geopotential Model Evaluations and Local Geoid in Indonesia: A Review
IOP Conference Series: Earth and Environmental Science, 2021 Abstract Geoid model was chosen as a vertical reference in Indonesia based on the Head of the Geospatial Information Agency Regulation (Perka BIG) No. 15 of 2013 concerning the Indonesian Geospatial Reference System (SRGI2013). Therefore, the development of local geoid models continues to be carried out to obtain good accuracy. The geoid
Hamidatul Aminah, Ira Mutiara Anjasmara
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A combined regional Geopotential Model using optimized global Gravity Field Solutions
IOP Conference Series: Earth and Environmental Science, 2022 Abstract To develop a gravimetric geoid, a Global Geopotential Model (GGM) is required to minimise the truncation error arising from using the Stokes integral with a limited number of gravity data points. The choice of a best-fitting GGM determines the accuracy of a gravimetric geoid solution.
C J Nyoka +3 more
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Frontiers in Earth Science, 2021 The development of the global geopotential model (GGM) broadens its applications in ocean science, which emphasizes the importance for model assessment.
Yihao Wu +3 more
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Remote Sensing, 2020 The launch of dedicated satellite missions at the beginning of the 2000s led to significant improvement in the determination of Earth gravity field models.
Bihter Erol +2 more
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Applied Sciences, 2020 Precise geoid heights are not as important for understanding Earth’s gravity field, but they are important to geodesy itself, since the vertical datum is defined as geoid in a cm-level accuracy.
Kwang Bae Kim +2 more
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Remote Sensing, 2020 Unification of the global vertical datum has been a key problem to be solved for geodesy over a long period, and the main challenge for a unified vertical datum system is to determine the vertical offset between the local vertical datum and the global ...
Panpan Zhang +7 more
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ASSESSMENT OF RECENT GOCE-BASED GLOBAL GEOPOTENTIAL MODELS AND EGM2008 IN NIGER REPUBLIC
Geodesy and cartography, 2019 In this study, we assessed recent GOCE-based Global Geopotential Models (GGMs) and EGM2008 in Niger. The combined GGMs EIGEN_6C4, GECO and EGM2008 were evaluated up to their maximum degree and order (d/o) 2,190 to select the one for gravity database densification. The following pure satellite GGMs were assessed for the modelling of the long and medium
Salissou Ibrahim Yahaya, Driss El Azzab
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EVALUATION OF RECENT GLOBAL GEOPOTENTIAL MODELS BY GNSS/LEVELLING DATA: INTERNAL AEGEAN REGION
International Journal of Engineering and Geosciences, 2016 Global geopotential models of spherical harmonic coefficients are used to determine the external gravitational field of the Earth. These coefficients are derived from satellite orbit perturbations, terrestrial gravity anomalies and altimeter data. Hundreds of thousands of coefficients and standard deviation values for these coefficients are estimated ...
YİLMAZ, Mustafa +3 more
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Gis-Based Accuracy Assessment of Global Geopotential Models: A Case Study of Egypt
American Journal of Geographic Information System, 2018 Geoid modelling is a fundamental procedure in geomatics and geosciences applications to estimate the orthometric heights from the ellipsoidal heights measured using Global Navigation Satellite Systems (GNSS) observations. In case of no local geoid model is available for any area, a Global Geopotential Model (GGM) is utilized for height conversion ...
Ahmed El Shouny +3 more
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Open Geosciences, 2023 The orthometric height has an essential role in a variety of civil engineering projects and it is defined as the length of the curved plumbline from a point (on the earth surface) to its intersection with the geoid surface. Leveling process is considered
Ahmed Al Shouny +3 more
semanticscholar +1 more source