The impact of new geoid height models on estimates of the ocean circulation, now available from the Gravity Recovery and Climate Experiment (GRACE) spacecraft, is assessed, and the implications of far more accurate geoids, anticipated from the European Space Agency’s (ESA) Gravity and Ocean Circulation Explorer (GOCE) mission, are explored. The study is based on several circulation estimates ob...

In this letter we reexamine the evaluation of the error due to the even zonal harmonics of the geopotential in some proposed tests of relativistic gravitomagnetism with existing and proposed laser–ranged LAGEOS–like satellites in the gravitational field of the Earth. A more conservative and realistic approach is followed by using the diagonal part only of the covariance matrix of the EGM96 Eart...

The Lense-Thirring effect is currently being measured by means of a combination of the orbital residuals of the nodes of LAGEOS and LAGEOS II and the perigee of LAGEOS II. The total error is of the order of 20%. The most insidious systematic error is due to the mismodelled even zonal harmonics of the geopotential and amounts to 12.9%, according to EGM96 model. The role and the importance of the...

Abstract The Digital Elevation Models (DEMs) are used to represent the topographic surface of earth as it is in many applications. Nowadays, free DEMs available online. This study aims assess accuracy six DEMs. research uses GPS observations determine elevation stations area by using Post-Processing Kinematic (PPK) technique and compares these elevations against computed at same online (DEMs): ...

The choice of global geopotential model used in remove-restore technique for determination of regional quasigeoid from gravity data may affect the solution, in particular when the accuracy is supposed to reach a centimetre level. Global geopotential model plays also an important role in validating height anomalies at GPS/levelling sites that are used for the estimation of the external accuracy ...

In this paper we use, in a very preliminary way, the recently released EIGEN2 Earth gravity model, which is based on six months of data of CHAMP only, in order to reassess the systematic error due to the mismodelling in the even zonal harmonics of geopotential which represents one of the major sources of systematic errors in the LAGEOS–LAGEOS II Lense–Thirring experiment involving the nodes of ...