Regional Evaluation of GOCE-Based GGMs with Ground-Based Gravity and GPS/Levelling Data over Egypt

Faculty Engineering Year: 2019
Type of Publication: ZU Hosted Pages:
Authors:
Journal: International Journal of Geosciences Scientific Research Publishing Volume:
Keywords : Regional Evaluation , GOCE-Based GGMs with Ground-Based Gravity    
Abstract:
The gravity field and steady-state ocean circulation explorer (GOCE) satellite mission has provided numerous Global Geopotential Models (GGMs) with different processing methodologies and model accuracies. In the current contribution, the latest releases of GOCE-based GGMs are evaluated on the regional scale using the available terrestrial GPS/Levelling and gravity data collected over Egypt. To overcome the spectral inconsistency between the GOCE-based GGMs and the ground-based data, the spectral enhancement method (SEM) is applied. Five of GOCE-based GGMs have been used, namely GOSG01S, IGGT_R1, IfE_GOCE05s_ GO_CONS_GCF_2_SPW_R5 (SPW_R5 in the following) and NULP-02. The evaluation process of GOCE-based GGMs with the available ground data over Egypt considering the SEM method shows remarkable improvements obtained from the SPW_R5 model. The model provides lower differences of the standard deviations with respect to the EGM2008 and the other applied geopotential gravity models as well as the applied ground-based gravity and GPS/Levelling data. The findings regarding the ground-based data show obvious reductions of about 15.16% and 32.22% achieved by the GOCE-based model in term of standard deviations differences of gravity anomalies and geoid heights, respectively. Therefore, the SPW_R5 model is recommended to be applied as a reference model for compensating the long-to-short wavelength (up to spherical harmonics degree/ order 280) components when modelling the gravimetric geoid over Egypt.
   
     
 
       

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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 More
  • 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 More
  • 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 More
  • Mohammed Ahmed Ali Alashkar , "An Improved Local Geoid Model for Egypt using Satellite Geopotetial and Terrestrial Data", Ain Shams University, Faculty of Engineering, 2017 More
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