Zagazig University Digital Repository
Home
Thesis & Publications
All Contents
Publications
Thesis
Graduation Projects
Research Area
Research Area Reports
Search by Research Area
Universities Thesis
ACADEMIC Links
ACADEMIC RESEARCH
Zagazig University Authors
Africa Research Statistics
Google Scholar
Research Gate
Researcher ID
CrossRef
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:
Mohammed Ahmed Ali Alashkar
Staff Zu Site
Abstract In Staff Site
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.
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
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
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
More
Department Related Publications
Ahmed Hessien Mahmoud Mohamed Elyamany, "A Performance Evaluating Model For Construction Companies: Egyptian Case Study", ASCE, 2008
More
Ahmed Abdelaaty Gaballah Elsayaad, "Construction of Ameria Caisson in Egypt", Journal of Construction Engineering and Management, ASCE, 1995
More
Ismaiel Abdelhamied Mohamed Basha, "Construction of Ameria Caisson in Egypt", Journal of Construction Engineering and Management, ASCE, 1995
More
Mohamed Ismail Ahmed Amer, "Construction of Ameria Caisson in Egypt", Journal of Construction Engineering and Management, ASCE, 1995
More
Amr Abdelaziz Mohamed Mosa , "Measuring Important Factors Affecting Construction Projects Duration", Journal of Al Azhar Univ. Eng. Sector, 2014
More
جامعة المنصورة
جامعة الاسكندرية
جامعة القاهرة
جامعة سوهاج
جامعة الفيوم
جامعة بنها
جامعة دمياط
جامعة بورسعيد
جامعة حلوان
جامعة السويس
شراقوة
جامعة المنيا
جامعة دمنهور
جامعة المنوفية
جامعة أسوان
جامعة جنوب الوادى
جامعة قناة السويس
جامعة عين شمس
جامعة أسيوط
جامعة كفر الشيخ
جامعة السادات
جامعة طنطا
جامعة بنى سويف