Evaluation of pre-CHAMP gravity models `GRIM5-S1' and `GRIM5-C1' with satellite crossover altimetry |
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| Authors: | J Klokočník Ch Reigber P Schwintzer C A Wagner J Kostelecký |
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| Institution: | (1) GeoForschungsZentrum Potsdam (GFZ), Division `Kinematics and Dynamics of the Earth', 14473 Potsdam, Telegrafenberg A17, Germany e-mails: klokoc@gfz-potsdam.de; reigber@gfz-potsdam.de; psch@gfz-potsdam.de , DE;(2) Astronomical Institute of the Academy of Sciences of the Czech Republic, 251 65 Ondřejov Observatory, Czech Republic e-mail: jklokocn@asu.cas.cz, CZ;(3) NOAA/NESDIS Laboratory for Satellite Altimetry, 1315 East–West Highway, Silver Spring, MD 20910, USA e-mail: carl.wagner@noaa.gov, US;(4) Research Institute of Geodesy, Topography and Cartography, 250 66 Zdiby 98, Czech Republic e-mail: kost@fsv.cvut.cz, CZ |
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| Abstract: | The new GFZ/GRGS gravity field models GRIM5-S1 and GRIM5-C1, currently used as initial models for the CHAMP mission, have
been compared with other recent models (JGM 3, EGM 96) for radial orbit accuracy (by means of latitude lumped coefficients)
in computations on altimetry satellite orbits. The bases for accuracy judgements are multi-year averages of crossover sea
height differences from Geosat and ERS 1/2 missions. This radially sensitive data is fully independent of the data used to
develop these gravity models. There is good agreement between the observed differences in all of the world's oceans and projections
of the same errors from the scaled covariance matrix of their harmonic geopotential coefficients. It was found that the tentative
scale factor of five for the formal standard deviations of the harmonic coefficients of the new GRIM fields is justified,
i.e. the accuracy estimates, provided together with the GRIM geopotential coefficients, are realistic.
Received: 20 February 2001 / Accepted: 24 October 2001 |
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| Keywords: | : Gravity Field models – Accuracy assessment – Satellite Crossover Altimetry |
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