NDLI: Making the connection between Geosat and TOPEX/Poseidon

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Use of potential coefficient models for geoid undulation determinations using a spherical harmonic representation of the height anomaly/geoid undulation difference

Precision, volume and eigenspectra for GPS ambiguity estimation based on the time-averaged satellite geometry

IAG Newsletter : Journal of Geodesy , Volume 71 , Issue 5

Journal of Geodesy : Volume 71, Issue 4, March 1997

Journal of Geodesy : Volume 71, Issue 3, February 1997

Journal of Geodesy : Volume 71, Issue 2, January 1997

Making the connection between Geosat and TOPEX/Poseidon

Content Provider	Springer Nature Link
Author	Wagner, C. Klokoc˘ník, J. Cheney, R.
Copyright Year	1997
Abstract	We can presently construct two independent time series of sea level, each at a precision of a few centimeters, from Geosat (1985–1988) and TOPEX/Poseidon (1992–1995) collinear altimetry. Both are based on precise satellite orbits computed using a common geopotential model, JGM-2 (Nerem et al. 1994). We have attempted to connect these series using Geosat-T/P crossover differences in order to assess long-term ocean changes between these missions. Unfortunately, the observed result are large-scale sea level differences which appear to be due to a combination of geodetic and geopotential error sources. The most significant geodetic component seems to be a coordinate system bias for Geosat sea level (relative to T/P) of −7 to −9 cm in the y-axis (towards the Eastern Pacific). The Geosat-T/P sea height differences at crossovers (with JGM-2 orbits) probably also contain stationary geopotential-orbit error of about the same magnitude which also distort any oceanographic interpretation of the observed changes. We also found JGM-3 Geosat orbits have not resolved the datum errors evident from the JGM-2 Geosat -T/P results. We conclude that the direct altimetric approach to accurate determination of sea level change using Geosat and T/P data still depends on further improvement in the Geosat orbits, including definition of the geocenter.
Starting Page	273
Ending Page	281
Page Count	9
File Format	PDF
ISSN	09497714
Journal	Journal of Geodesy
Volume Number	71
Issue Number	5
e-ISSN	14321394
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-04-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geophysics/Geodesy Mathematical Applications in Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology Computers in Earth Sciences

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DORIS time bias estimated using Jason-1, TOPEX/Poseidon and ENVISAT orbits

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The ERS-2 altimetric bias and gravity field enhancement using dual crossovers between ERS and TOPEX/Poseidon

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Mean Earth'S Equipotential Surface From Topex/Poseidon Altimetry

Making the connection between Geosat and TOPEX/Poseidon

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