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Assessment and fitting of high/ultra resolution global geopotential models using GNSS/levelling over Egypt.

Authors :
Zayed, Abdelaty Mohammed
Saber, Ahmed
Hamama, Mostafa
Rabah, Mostafa
Zaki, Ahmed
Source :
Journal of Applied Geodesy. Nov2024, p1. 12p. 6 Illustrations.
Publication Year :
2024

Abstract

This study conducts an evaluation of the performance of seven ultra-high-degree Global Geopotential Models (GGMs) across Egypt, utilizing GNSS/leveling data as a basis for assessment. The models under investigation include SGG-UGM-2, XGM2019e_2159, SGG-UGM-1, GECO, EIGEN-6C4, EGM2008, and GGMplus. The evaluation procedure comprises three principal steps: an absolute assessment, the implementation of Residual Terrain Modelling (RTM), and the fitting of GGMs to GNSS/leveling data. Among the models assessed, GECO exhibited the highest performance in the absolute assessment, achieving a standard deviation (STD) of 0.310 m, while SGG-UGM-1 recorded the largest STD at 0.353 m. Given Egypt’s predominantly flat topography, the application of RTM yielded only modest benefits. Nonetheless, all models demonstrated significant enhancements in accuracy through the fitting process, with EIGEN-6C4 emerging as the most successful model, attaining an STD of 0.116 m in external assessment. The accuracy improvements following the fitting procedure ranged from 49 % to 63 % across all models assessed. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
18629016
Database :
Academic Search Index
Journal :
Journal of Applied Geodesy
Publication Type :
Academic Journal
Accession number :
180983989
Full Text :
https://doi.org/10.1515/jag-2024-0068