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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:
Mohammed Ahmed Ali Alashkar
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
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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Mohammed Ahmed Ali Alashkar , "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", CrossRef, 2022
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Department Related Publications
Ahmed Hessien Mahmoud Mohamed Elyamany, "A Performance Evaluating Model For Construction Companies: Egyptian Case Study", ASCE, 2008
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Ahmed Abdelaaty Gaballah Elsayaad, "Construction of Ameria Caisson in Egypt", Journal of Construction Engineering and Management, ASCE, 1995
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Ismaiel Abdelhamied Mohamed Basha, "Construction of Ameria Caisson in Egypt", Journal of Construction Engineering and Management, ASCE, 1995
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Mohamed Ismail Ahmed Amer, "Construction of Ameria Caisson in Egypt", Journal of Construction Engineering and Management, ASCE, 1995
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Ahmed Hussien Ibrahim Mahmmoud, "Measuring Important Factors Affecting Construction Projects Duration", Journal of Al Azhar Univ. Eng. Sector, 2014
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