Comparison of Different Approaches for Combining Gravity Field Wavelengths for Egypt

Abstract

Within the context of the remove-restore technique, this research seeks to determine the best combination of gravity field wavelengths for Egypt’s geoid computation. There are various methods for such a wavelength combination. It has been proposed to merge the regional data signals and the global geopotential earth models, potentially using a modified Stokes’ kernel with various methods. Firstly, from our computations, it can be concluded that the conventional remove-restore technique should not be applied for the determination of gravity anomalies and geoid determination. Also, the outcomes demonstrated that the estimated gravity anomalies utilizing the window approach are independent, the finest, and unbiased and have a minimal difference between the maximum and minimum values. The geoid produced from the GPS levelling has fewer differences between it and the geoids computed using the modified Stokes’ kernels as well as the geoid determined using the window technique than in the case of utilizing the unmodified Stokes’ classical kernel. Finally, the window approach gives, however, completely better outcomes compared to the Stokes unmodified kernel method.

Keywords

• remove- restore technique
• gps-levelling
• heck geoid
• meissl geoid
• gore geoid