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:
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 More
  • Gamal Saber Ahmed Elfiky, "Distribution of vertical crustal movement rates in the Tohoku district, Japan, predicted by least-squares collocation", Springer, 1997 More
  • Gamal Saber Ahmed Elfiky, "Continuous distribution of the horizontal strain in the Tohoku district, Japan, predicted by least!squares collocation", elsevier, 1999 More
  • Gamal Saber Ahmed Elfiky, "Crustal deformation and interplate coupling in the Shikoku district, Japan, as seen from continuous GPS observation", elsevier, 1999 More
  • Gamal Saber Ahmed Elfiky, "Elastic and inelastic strains in the Japanese Islands deduced from GPS dense array", Earth Planets Space, Japan, 2000 More

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