@ARTICLE{Tocho_Claudia_A_2005,
 author={Tocho, Claudia and Vergos, Georgios S. and Sideris, Michael G.},
 volume={vol. 54},
 number={No 4},
 journal={Geodesy and Cartography},
 pages={177-189},
 howpublished={online},
 year={2005},
 publisher={Commitee on Geodesy PAS},
 abstract={Marine geoid modelling in the Atlantic coastal region of Argentina is problematic. Firstly, because of the insufficient amount of available shipborne gravity data, which renders a purely gravimetric solution not feasible. Secondly, because of the very strong ocean currents, that affect the quality of satellite altimetry data, so that a purely altimetrie model is too noisy, even after low-pass filtering the Sea Surface Heights (SSHs) to remove (part of) the influence of the oceanographic signals. Thus, the recommended solution is to employ a combination method and the use of all the available gravity and altimetry data together. This is a suitable solution since (i) combination methods such as least squares collocation and Input Output System Theory (!OST) inherently low-pass filter and weigh the data, and (ii) will make use of the altimetrie heights to fill the gaps of the shipborne gravity data. Following this idea, purely altimetrie, gravimetric and combined (using the !OST method) marine geoid models have been estimated for Argentina, employing all available shipborne gravity data, satellite altimetry SSHs and the latest Earth Gravity Models (EGMs) developed from CHAMP and GRACE missions. The new EGMs are especially useful to assess the quality of the new geoid models, especially against EGM96, which was used in an older ERSl-only solution for the same area. From the comparison of the estimated geoid models with respect to stacked TOPEX/Poseidon SSHs, the authors found that the altimetrie model provides the best agreement while the combined one improves the accuracy (I a) of the gravimetric solution.},
 type={Article},
 title={A new marine geoid model for Argentina combining altimetry, shipborne gravity data and CHAMP/GRACE-type EGMs},
 URL={http://www.journals.pan.pl/Content/121293/PDF/4_GK_VOL_54_NO_4_2005_Tocho_Nowy_model.pdf},
 keywords={Marine geoid, altimetry, shipborne gravity, IOST, "combined" EGM, GRACE, CHAMP},
}