Offshore Absolute Calibration of Space-Borne Radar Altimeters

Autor: E. Jeansou, Mathilde Faillot, Florent Lyard, Pascal Bonnefond, Gwenaële Jan, Y. Menard
Rok vydání: 2004
Předmět:
Zdroj: Marine Geodesy. 27:615-629
ISSN: 1521-060X
0149-0419
Popis: Absolute calibration of sea level measurements collected from space-borne radar altimeters is usually performed with respect to collocated sea level in situ records from tide gauges or GPS buoys (Menard et al. 1994; Haines et al. 1996; Bonnefond et al. 2003; Haines et al. 2003; Schum et al. 2003; Watson et al. 2003; Watson et al. 2004). Such a method allows regular and long-term control of altimetric systems with independent records. However, this approach is based on a single, geographically dependent point. In order to obtain more significant and accurate bias and drift estimates, there is a strong interest in multiplying the number of calibration opportunities. This article describes a method, called the “offshore method” that was developed to extend the single-point approach to a wider regional scale. The principle is to compare altimeter and tide gauge sea level data not only at the point of closest approach of an overflying pass, but also at distant points along adjacent satellite passes. However, c...
Databáze: OpenAIRE
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