Combination of ERS-1 and TOPEX altimetry for precise geoid and gravity recovery in the Mediterranean Sea.

Details Combination of ERS-1 and TOPEX altimetry for precise geoid and gravity recovery in the Mediterranean Sea. Combination of ERS-1 and TOPEX altimetry for precise geoid and gravity recovery in the Mediterranean Sea.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996geoji.125..285a&link_type=abstract

Geophysical Journal International, Vol. 125, No. 1, p. 285 - 302

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2

Satellite Geodesy, Geoid

Scientific paper

From the separate processing and crossover analysis of repeat ERS-1 and TOPEX altimeter data in the Mediterranean basin it was assessed that the TOPEX data are characterized by higher accuracy than that of ERS-1 and other previous mission data. It is also known from the coverage of both missions that the resolution of ERS-1 data is superior to that of the TOPEX data, since the distance across track in the TOPEX mission is about four times the corresponding distance in the ERS-1 mission for the 35-day repeat. Therefore, taking into account the advantages and drawbacks of both missions, a common adjustment of both altimeter data sources was carried out in order to improve the prediction accuracy of gravity anomalies and geoid heights in the Mediterranean Sea. The computed sea-surface heights (SSHs) have been used in two trials. The first one was the recovery of sea gravity anomalies by an inversion of the adjusted altimeter data. The second test run comprised comparisons between the adjusted SSHs and the corresponding gravimetric geoidal heights in order to obtain a rough estimation of the sea-surface topography in the Mediterranean Sea.

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