A Data Set of Sea Surface Stereo Images to Resolve Space-Time Wave Fields
Stereo imaging observations of the sea surface elevation provide unique field data to investigate geometry and dynamics of oceanic waves. Typically, this technique allows to retrieve the 4-D ocean topography (3-D space + time) at high frequency (up to 15-20 Hz) over a sea surface region of area ~10^4 m^2. Stereo data fill the existing wide gap between sea surface elevation time-measurements, like the local observation provided by wave buoys, and large-scale ocean observations by satellites. The analysis of stereo images provides a direct measurement of the wavefield without the need of any linear-wave theory assumption, so it is particularly interesting to investigate the nonlinearities of the wave field, wave-current interaction, rogue waves, wave-wave interaction, wave breaking, air-sea interaction, and potentially other processes not explored yet. In this context, this open data set aims at providing the oceanographic community, for the first time, valuable stereo measurements collected in different seas and wave conditions to invite the ocean-wave scientific community to continue exploring these data and to contribute to a better understanding of the nature of the sea surface dynamics.
Data access Chemin d'accès |
/home/ref-stereo
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Author(s) Auteur(s) |
Pedro Veras Guimaraes
(
France Energies Marines, Plouzané, France
)
Fabrice Ardhuin ( Univ. Brest, CNRS, IRD,Ifremer, Laboratoire d’Oceánographie Physique et Spatiale (LOPS) IUEM, Plouzané, France ) Filippo Bergamasco ( DAIS - Università Ca’ Foscari, Venice, Italy ) Fabien Leckler ( Service hydrographique et océanographique de la Marine (SHOM, HOM, REC), Brest, 29200, France ) Jean-François Filipot ( France Energies Marines, Plouzané, France ) Jeseon Yoo ( KIOST – Korea Institute of Ocean Science and Technology, Busan, South Korea ) Alvise Benetazzo ( nstitute of Marine Sciences, Italian National Research Council (ISMAR-CNR), Venice, 30122, Italy ) |
Contact(s) Contact(s) |
IFREMER
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Source Source |
Fabrice Ardhuin, Alvise Benetazzo, Pedro Veras Guimaraes |
Lineage Généalogie |
Stereo imaging measurement of the sea surface elevation is based on single snapshots or time records captured by a pair of synchronized and calibrated cameras. As a general principle, stereo imaging results in a surface elevation map zeta(x, y, t)in the horizontal physical 2-D space {x} = (x, y) and time {t}. The coverage area, accuracy, and resolution depend mostly on the experimental setup (e.g. the distance between the cameras), camera specifications, and lenses. One of the greatest advantage of having the space-time elevation field zeta(x, y, t) is to compute the 3-D wavenumber/frequency spectrum without the need of invoking any (e.g. linear) wave theory for background noise removal and signal selection. This is most important for the short wave components, for which nonlinear contributions are more significant. This observation technique is very powerful to investigate many different process related to the sea surface and it brings a new perspective to investigate ocean waves, specially at mid to short scales. Stereo imaging connects the missing information between large to small-scale ocean observations (i.g, 10~m pixel resolution by SAR images) or a single point high frequency observation (wave gauge, moored buoys and others). In this context, stereo video have been prof to be useful to explore different aspects of ocean waves. We aim at presenting a valuable stereo-image data set, free available for the scientific community. This data set contains original records, calibration files, configuration files for processing, and examples of post-processed surface elevation maps collected during several oceanic campaigns, at different locations around the world ocean and under different sea state conditions. All this makes this data set especially useful to explore a common framework to investigate ocean waves and the sea surface dynamics. |
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Spatial informations Informations géographiques |
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Citation proposal Proposition de citation
Pedro Veras Guimaraes , Fabrice Ardhuin , Filippo Bergamasco , Fabien Leckler , Jean-François Filipot , Jeseon Yoo , Alvise Benetazzo (2019).A Data Set of Sea Surface Stereo Images to Resolve Space-Time Wave Fields.IFREMER
http://dx.doi.org/10.12770/af599f42-2770-4d6d-8209-13f40e2c292f