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Determination of local gravimetric geoid model over Egypt using LSC and FFT estimation techniques based on different satellite- and ground-based datasets
Faculty
Engineering
Year:
2021
Type of Publication:
ZU Hosted
Pages:
Authors:
Gamal Saber Ahmed Elfiky
Staff Zu Site
Abstract In Staff Site
Journal:
Survey Review Taylor & Francis
Volume:
Keywords :
Determination , local gravimetric geoid model over
Abstract:
In this contribution, two gravimetric geoid models for Egypt; EGY-LGM2019 and EGY-FGM2019 are developed using the least-squares collocation and the Fast-Fourier Transformation methods, applying Remove-Restore procedure. Different datasets are used in terms of gravity anomalies obtained from GOCE-based SPW-R5 and EGM2008 models, and from 1015 terrestrial gravity stations. Two gravimetric geoid models, EGY-FLGM2019 derived by the LSC method and EGY-FFGM2019 derived by 1D-FFT method are computed and fitted using the 17 GPS/levelling measurements to adjust the gravimetric geoid model with the national local vertical datum for Egypt. Our findings between the 6 GPS/levelling geoid undulations and the developed fitted geoid models EGY-FFGM2019 and EGY-FLGM2019 are about 7.57 and 18.46 cm, respectively. In addition, the former model improves the geoid heights of about 72-65% over Egypt w.r.t. the EGM2008 and GECO models, respectively. Therefore, the EGY-FFGM2019 model is recommended as a reliable model that improves the geoid heights over Egypt.
Author Related Publications
Gamal Saber Ahmed Elfiky, "Crustal Strains Field in the Vicinity of the Northern Part of Nasser Lake, Egypt, as Deduced from GPS Measurements and its Tectonic Implications", AL-Azhar University,Egypt, 2011
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Gamal Saber Ahmed Elfiky, "Distribution of vertical crustal movement rates in the Tohoku district, Japan, predicted by least-squares collocation", Springer, 1997
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Gamal Saber Ahmed Elfiky, "Continuous distribution of the horizontal strain in the Tohoku district, Japan, predicted by least!squares collocation", elsevier, 1999
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Gamal Saber Ahmed Elfiky, "Crustal deformation and interplate coupling in the Shikoku district, Japan, as seen from continuous GPS observation", elsevier, 1999
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Gamal Saber Ahmed Elfiky, "Elastic and inelastic strains in the Japanese Islands deduced from GPS dense array", Earth Planets Space, Japan, 2000
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Department Related Publications
Ahmed Elsayed Ali Mahmoud, "An Integrated Sustainable Construction Project’s Critical Success Factors (ISCSFs)", Sustainable Engineering and Science, 2021
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Ahmed Hussien Ibrahim Mahmmoud, "Management of Construction Cost Contingency Covering Upside and Downside Risks.", Alexandria Engineering Journal (AEJ),, 2014
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Ahmed Hussien Ibrahim Mahmmoud, "Modelling the Financial Performance of Construction Companies Using Neural Networks via Genetic Algorithm.", Canadian Journal of Civil Engineering (CJCE), 2014
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Ahmed Hussien Ibrahim Mahmmoud, "Estimating Cost Contingency for Highway Construction Projects Using Analytic Hierarchy Processes.", International Journal of Computer Science Issues (IJCSI), 2014
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Ahmed Hessien Mahmoud Mohamed Elyamany, "Developing A Quality Measure For Evaluating The Contractor Performance Ii Asphalt Pavement Construction", Chinese Society of Pavement Engineering, 2013
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