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Preliminary study of marine geoid model in the Argentinean Atlantic Ocean

Cláudia Tocho, George Vergos, Michael G. Sideris


The objective of this paper is to present the studies conducted for the determination
of marine geoid model in the Atlantic coastal region of Argentina using satellite
altimetry and shipborne gravity data. The altimetry data of the satellite altimetry
mission ERS1 and shipborne gravity data were used to compute a pure altimetric
geoid and a pure gravimetric geoid, respectively using the well known removerestore
technique. The effect of the Quasi-Stationary Sea Surface Topography
(QSST) and the effect of the Sea Surface Variability (SSV)were taken into account
during the processing of the different solutions. From the results achieved it was
concluded that the pure altimetric geoid has an accuracy of near 8 cm in some
areas, while the pure gravimetric solution gives poorer results. The accuracy of the
final geoid models was assessed through comparisons with stacked
TOPEX/POSEIDON (T/P) SSHs, known for their high precision. In order to
improve the accuracy of the gravimetric geoid, a combined solution using the
Multiple input –Multiple output system theory , known as MIMOST were used.
MIMOST allow to combine heterogeneous data in the spectral domain. The
combination of satellite and shipborne data with the proposed algorithm improves
the accuracy of the gravimetric geoid model by about 2 cm.


marine geoid, altimetric geoid, gravimetric geoid, combined geoid, sea surface heights, heterogeneous data; geoide marino, geoide altimétrico, geoide gravimétrico, geoide combinado altura instantánea de la superficie del mar, datos heterogéneos