Satellite-only Versus Combined High Degree Global Geopotential Model Tailored to Gravity Field in Egypt, Using Integral Formulas
Global Geopotential Models (GGMs) may contain long-wavelength errors due to
difficulties in collecting and using global heterogeneous gravity data, which further
degrades the quality of regional gravity field modelling.
In this study, satellite-only and high degree reference geopotential models denoted as
GOCO05s and EGM2008, respectively, have been tailored (refined) to fit the gravity
data in Egypt using integral formulas in order to select the optimal model that can be
used for the reference gravity field model for the Egyptian territory.
The results show that the tailored model of EGM2008 denoted as EGTM0817 is the one
that gives better results in Egypt than the other tailored model of GOCO05s denoted as
EGTGOC5s, where the mean value, the standard deviation and the range of the reduced
gravity anomalies to EGTM0817 compared with EGTGOC5s have lesser values by
about 80%, 30%, and 21%, respectively.
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