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Determination of Local Quasi-Geoid Models using FFT Estimation Technique based on Combined Gravity Anomalies from CHAMP, GRACE, GOCE, Future Satellite Missions and in-Situ Gravity observations in Western Desert of Egypt
Faculty
Engineering
Year:
2022
Type of Publication:
ZU Hosted
Pages:
Authors:
Mohammed Ahmed Ali Alashkar
Staff Zu Site
Abstract In Staff Site
Journal:
IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG) CrossRef
Volume:
Keywords :
Determination , Local Quasi-Geoid Models using , Estimation
Abstract:
Determination of gravity field from space has been successfully improved during the last two decades by launching satellite gravity missions. In this contribution, numerous gravimetric quasi-geoid models are determined from ground-truth gravity anomalies of the past (CHAMP, GRACE and GOCE) and future (e.g. Bender-type, Cartwheel-type, Helix-type and Pendulum-type) satellite gravity missions combined with ground-based terrestrial free-air anomalies over a selected zone of the Western Deseret of Egypt between 23N to 27N and from 30E to 32 E as a case study. Regarding to the methodology, the fast Fourier transformation (1D-FFT) method will be implemented. The findings over a selected zone of the Egyptian Western Desert show a superiority of the future gravity missions, particularly the Bender-type in modelling the local quasi-geoid heights providing the least standard deviations (st. dev.) in terms of residual quasi-geoid heights of about 32.571 cm w.r.t. the past gravity missions (CHAMP, GRACE and GOCE), which provide st. dev. ranging between 32.64 to 36.51 cm.
Author Related Publications
Mohammed Ahmed Ali Alashkar , "Determination of local gravimetric geoid model over Egypt using LSC and FFT estimation techniques based on different satellite- and ground-based datasets", Taylor & Francis, 2021
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Mohammed Ahmed Ali Alashkar , "On the Accuracy Assessment of the Latest Releases of GOCE Satellite-Based Geopotential Models with EGM2008 and Terrestrial GPS/Levelling and Gravity Data over Egypt", Scientific Research Publishing, 2016
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Mohammed Ahmed Ali Alashkar , "Accuracy Assessment of GPS Leveling Applications: Case Study, North West Lake Nasser Aswan, Egypt", Ain Shams University, Faculty of Engineering, 2016
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Mohammed Ahmed Ali Alashkar , "An Improved Local Geoid Model for Egypt using Satellite Geopotetial and Terrestrial Data", Ain Shams University, Faculty of Engineering, 2017
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Mohammed Ahmed Ali Alashkar , "EGY-HGM2016: an improved hybrid local geoid model for Egypt based on the combination of GOCE-based geopotential model with gravimetric and GNSS/levelling measurements", Springer, 2017
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Gamal Saber Ahmed Elfiky, "Determination of local gravimetric geoid model over Egypt using LSC and FFT estimation techniques based on different satellite- and ground-based datasets", Taylor & Francis, 2021
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Mohammed Ahmed Ali Alashkar , "Determination of local gravimetric geoid model over Egypt using LSC and FFT estimation techniques based on different satellite- and ground-based datasets", Taylor & Francis, 2021
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