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Unsupervised Reconstruction of Sea Surface Currents from AIS Maritime Traffic Data Using Trainable Variational Models

Abstract : The estimation of ocean dynamics is a key challenge for applications ranging from climate modeling to ship routing. State-of-the-art methods relying on satellite-derived altimetry data can hardly resolve spatial scales below ∼100 km. In this work we investigate the relevance of AIS data streams as a new mean for the estimation of the surface current velocities. Using a physics-informed observation model, we propose to solve the associated the ill-posed inverse problem using a trainable variational formulation. The latter exploits variational auto-encoders coupled with neural ODE to represent sea surface dynamics. We report numerical experiments on a real AIS dataset off South Africa in a highly dynamical ocean region. They support the relevance of the proposed learning-based AIS-driven approach to significantly improve the reconstruction of sea surface currents compared with state-of-the-art methods, including altimetry-based ones
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https://hal.archives-ouvertes.fr/hal-03319098
Contributor : Simon Benaïchouche Connect in order to contact the contributor
Submitted on : Wednesday, August 11, 2021 - 4:06:57 PM
Last modification on : Monday, October 11, 2021 - 2:24:03 PM
Long-term archiving on: : Friday, November 12, 2021 - 7:25:09 PM

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Simon Benaïchouche, Clément Legoff, Yann Guichoux, François Rousseau, Ronan Fablet. Unsupervised Reconstruction of Sea Surface Currents from AIS Maritime Traffic Data Using Trainable Variational Models. Remote Sensing, MDPI, 2021, 13, ⟨10.3390/rs13163162⟩. ⟨hal-03319098⟩

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