COMPARISON OF DIFFERENT GRAVITY REDUCTION ' . TECHNIQUES FOR GEODETIC APPLICATIONS IN EGYPT

Abstract

It's known thut, in principle, ull gruvity reductions urc cquivulcnt and should yield the same geoid if the indirect effect has been taken into accounl. 1 Jowcvcr, there arc some requirements which should be Luken into consideration when deciding to usc a certain gravity reduction technique to determine the geoid. Mainly, the reduction should yield gravity anomalies that are small and smooth, and it must correspond to .a geophysical meaningful model. Also, the indirect erJcct should be as small as possible.