GRAVITY FIELD SOLUTION DERIVED FROM RECENT RELEASES OF GOCE-BASED GEOPOTENTIAL MODELS AND TERRESTRIAL GRAVITY OBSERVATIONS OVER THE KINGDOM OF SAUDI ARABIA

摘要

The free air gravity anomalies over Saudi Arabia (KSA)rnhas been estimated from the final releases of GOCEbasedrnglobal geopotential models (GGMs) comparedrnwith the terrestrial gravity anomalies of 3554 sites. TwornGGMs; EGM08 and Eigen-6C3 have been applied. Thernfree-air anomalies from GOCE-based, ΔgGGM, have beenrncalculated over the 3554 stations in the medium andrnshort spectrum of gravity wavelength of d/o 100, …,rn250 (with 10 step). The short spectrum has beenrncompensated once from d/o 101, …, 251 to 2190 andrn1949 using EGM08 and Eigen-6C3 (i.e. ΔgGGM),rnrespectively. The very short component was determinedrnusing residual terrain modelling approach. Our findingsrnshow firstly that the EGM08 is more reliable thanrnEigen-6C3. Second, the GOCE-based GGMs providernsimilar results within the spectral wavelength band fromrnd/o 100 to d/o 180. Beyond d/o 180 till d/o 250, wernfound that GOCE-based TIM model releases providernsubstantial improvements within the spectral band fromrnd/o 220 to d/o 250 with respect to the DIR releases.rnThird, the TIM_r5 model provides the least standardrndeviations (st. dev.) in terms of gravity anomalies.