Offshore Absolute Calibration of Space-Borne Radar Altimeters

Jan, Gwénaële; Ménard, Y.; Faillot, Mathilde; Lyard, Florent; Jeansou, E.; Bonnefond, Pascal

doi:10.1080/01490410490883469

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…In Harvest and Bass Strait, the number of selected crossover points is rather small in comparison to the number of available points. Large variability is observed in the bias estimates at those surrounding crossover points and they are discarded from the computation (see [19,20] for details). Some previous work on the Envisat mission in Bass Strait [24] showed that using a more recent tidal model with higher resolution (FES2014 global tidal model, [25]) enables us to drastically reduce the variability at some of those points and to reintegrate them in the computation in this specific region.…”

Section: Regional Calibration Of Saral/altika Sea Surface Height In Cmentioning

confidence: 99%

“…Given that most of the in situ calibration sites (Harvest, Senetosa, Bass Strait and Gavdos) were specifically designed to be located under the TOPEX/Jason orbit, the classical absolute calibration technique can only be used for satellites using this orbit. The regional cal/val technique developed by Noveltis [19,20] aims to assess the altimeter range bias both on satellite passes flying over the calibration site and on satellite passes located several hundreds of kilometres away ( Figure 9). In particular, it enables the monitoring of altimetry missions that do not fly directly over the calibration sites, such as SARAL/AltiKa.…”

Section: Regional Calibration Of Saral/altika Sea Surface Height In Cmentioning

confidence: 99%

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The Benefits of the Ka-Band as Evidenced from the SARAL/AltiKa Altimetric Mission: Quality Assessment and Unique Characteristics of AltiKa Data

et al. 2018

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Abstract:The India-France SARAL/AltiKa mission is the first Ka-band altimetric mission dedicated to oceanography. The mission objectives are primarily the observation of the oceanic mesoscales but also include coastal oceanography, global and regional sea level monitoring, data assimilation, and operational oceanography. The mission ended its nominal phase after 3 years in orbit and began a new phase (drifting orbit) in July 2016. The objective of this paper is to provide a state of the art of the achievements of the SARAL/AltiKa mission in terms of quality assessment and unique characteristics of AltiKa data. It shows that the AltiKa data have similar accuracy at the centimeter level in term of absolute water level whatever the method (from local to global) and the type of water surfaces (ocean and lakes). It shows also that beyond the fact that AltiKa data quality meets the expectations and initial mission requirements, the unique characteristics of the altimeter and the Ka-band offer unique contributions in fields that were previously not fully foreseen.

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Section: Regional Calibration Of Saral/altika Sea Surface Height In Cmentioning

confidence: 99%

Section: Regional Calibration Of Saral/altika Sea Surface Height In Cmentioning

confidence: 99%

The Benefits of the Ka-Band as Evidenced from the SARAL/AltiKa Altimetric Mission: Quality Assessment and Unique Characteristics of AltiKa Data

et al. 2018

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“…In addition to the Harvest platform, they ranged from a network of tide gauge sites in the United Kingdom (Woodworth et al, 2004) to sites at several islands in the Mediterranean Sea (Bonnefond et al, 2003;Jan et al, 2004;Martinez-Benjamin et al, 2004;Pavlis and Mertikas, 2004) and one site in Tasmania (Watson et al, 2003). In addition to the Harvest platform, they ranged from a network of tide gauge sites in the United Kingdom (Woodworth et al, 2004) to sites at several islands in the Mediterranean Sea (Bonnefond et al, 2003;Jan et al, 2004;Martinez-Benjamin et al, 2004;Pavlis and Mertikas, 2004) and one site in Tasmania (Watson et al, 2003).…”

Section: Calibration At Single Site Instrumented Platformsmentioning

confidence: 99%

Gravimetric Methods – Satellite Altimeter Measurements

Chambers

2015

Treatise on Geophysics

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“…However, the validation of interferometric altimetry is not only for along-track data; it is a validation of spatial resolution such as validate sea level variability between the different pixels at the same time in a swath. Now, the research on the Cal/Val methods of interferometric altimetry mainly focuses on the offshore method [11] and the steric method [12,13]. There is no perfect solution.…”

Section: Introductionmentioning

confidence: 99%

The Difference of Sea Level Variability by Steric Height and Altimetry in the North Pacific

Zhang

Chen

2020

Remote Sensing

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Sea level variability, which is less than ~100 km in scale, is important in upper-ocean circulation dynamics and is difficult to observe by existing altimetry observations; thus, interferometric altimetry, which effectively provides high-resolution observations over two swaths, was developed. However, validating the sea level variability in two dimensions is a difficult task. In theory, using the steric method to validate height variability in different pixels is feasible and has already been proven by modelled and altimetry gridded data. In this paper, we use Argo data around a typical mesoscale eddy and altimetry along-track data in the North Pacific to analyze the relationship between steric data and along-track data (SD-AD) at two points, which indicates the feasibility of the steric method. We also analyzed the result of SD-AD by the relationship of the distance of the Argo and the satellite in Point 1 (P1) and Point 2 (P2), the relationship of two Argo positions, the relationship of the distance between Argo positions and the eddy center and the relationship of the wind. The results showed that the relationship of the SD-AD can reach a correlation coefficient of ~0.98, the root mean square deviation (RMSD) was ~1.8 cm, the bias was ~0.6 cm. This proved that it is feasible to validate interferometric altimetry data using the steric method under these conditions.

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Offshore Absolute Calibration of Space-Borne Radar Altimeters

Cited by 12 publications

References 16 publications

The Benefits of the Ka-Band as Evidenced from the SARAL/AltiKa Altimetric Mission: Quality Assessment and Unique Characteristics of AltiKa Data

The Benefits of the Ka-Band as Evidenced from the SARAL/AltiKa Altimetric Mission: Quality Assessment and Unique Characteristics of AltiKa Data

Gravimetric Methods – Satellite Altimeter Measurements

The Difference of Sea Level Variability by Steric Height and Altimetry in the North Pacific

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