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Joint calibration and mapping of satellite altimetry data using trainable variaitional models

Abstract : <p>Satellite radar altimeters are a key source of observation of ocean surface dynamics. However, current sensor technology and mapping techniques do not yet allow to systematically resolve scales smaller than 100km. With their new sensors, upcoming wide-swath altimeter missions such as SWOT should help resolve finer scales. Current mapping techniques rely on the quality of the input data, which is why the raw data go through multiple preprocessing stages before being used. Those calibration stages are improved and refined over many years and represent a challenge when a new type of sensor start acquiring data.</p><p>We show how a data-driven variational data assimilation framework could be used to jointly learn a calibration operator and an interpolator from non-calibrated data . The proposed framework significantly outperforms the operational state-of-the-art mapping pipeline and truly benefits from wide-swath data to resolve finer scales on the global map as well as in the SWOT sensor geometry.</p><p>&#160;</p>
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https://hal-imt-atlantique.archives-ouvertes.fr/hal-03713287
Contributor : Quentin Febvre Connect in order to contact the contributor
Submitted on : Monday, July 4, 2022 - 3:29:40 PM
Last modification on : Friday, August 5, 2022 - 2:54:52 PM

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Quentin Febvre, Ronan Fablet, Julien Le Sommer, Clément Ubelmann. Joint calibration and mapping of satellite altimetry data using trainable variaitional models. EGU General Assembly 2022, May 2022, Vienne, Austria. ⟨10.5194/egusphere-egu22-12549⟩. ⟨hal-03713287⟩

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