Title

A Data Set of Sea Surface Stereo Images to Resolve Space-Time Wave Fields

Date (Creation)

2017-12-25

Date (Publication)

2019-11-26

Identifier

FR-330-715-368-00032-DATARMOR_SEA_SURFACE_STEREO_WAVE

Identifier

DOI:10.12770/af599f42-2770-4d6d-8209-13f40e2c292f

Abstract

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.

Credit

Fabrice Ardhuin, Alvise Benetazzo, Pedro Veras Guimaraes

Point of contact

Organisation name	Individual name	Electronic mail address	Role
France Energies Marines, Plouzané, France	Pedro Veras Guimaraes		Author
Univ. Brest, CNRS, IRD,Ifremer, Laboratoire d’Oceánographie Physique et Spatiale (LOPS) IUEM, Plouzané, France	Fabrice Ardhuin	Fabrice.Ardhuin@ifremer.fr	Author
DAIS - Università Ca’ Foscari, Venice, Italy	Filippo Bergamasco		Author
Service hydrographique et océanographique de la Marine (SHOM, HOM, REC), Brest, 29200, France	Fabien Leckler		Author
France Energies Marines, Plouzané, France	Jean-François Filipot		Author
KIOST – Korea Institute of Ocean Science and Technology, Busan, South Korea	Jeseon Yoo		Author
nstitute of Marine Sciences, Italian National Research Council (ISMAR-CNR), Venice, 30122, Italy	Alvise Benetazzo		Author
IFREMER		sismer@ifremer.fr	Publisher

GEMET - INSPIRE themes, version 1.0

• Meteorological geographical features

Thèmes Sextant

• /Physical Environment/Climatology

Keywords

• Stereo video

• ocean waves

• wave breaking

• sea surface elevation

Use limitation

CC-BY (Creative Commons - Attribution)

Access constraints

License

Use constraints

License

Other constraints

CC-BY (Creative Commons - Attribution)

Spatial representation type

Grid

Metadata language

English

Character set

UTF8

Topic category

• Oceans

Begin date

2011-09-30

End date

2018-01-02

Reference system identifier

EPSG / WGS 84 (EPSG:4326) / 8.6

Topology level

Geometry only

Number of dimensions

2

Dimension name

Column

Dimension name

Row

Cell geometry

Area

Distribution format

Name	Version

OnLine resource

Protocol	Linkage	Name
WWW:LINK	https://archimer.ifremer.fr/doc/00428/53934/	Publication
WWW:LINK-1.0-http--metadata-URL	http://dx.doi.org/10.12770/af599f42-2770-4d6d-8209-13f40e2c292f	DOI of the dataset

OnLine resource

Protocol	Linkage	Name
NETWORK:LINK	/home/ref-stereo

OnLine resource

Protocol	Linkage	Name
WWW:DOWNLOAD-1.0-link--download	https://data-dataref.ifremer.fr/stereo/	Download link

Hierarchy level

Dataset

Statement

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.

Metadata

File identifier

af599f42-2770-4d6d-8209-13f40e2c292f

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2021-08-11T16:54:50

Metadata standard name

ISO 19115:2003/19139 - SEXTANT

Metadata standard version

1.0

Metadata author

Organisation name	Individual name	Electronic mail address	Role
IFREMER	Accensi Mickael	Mickael.Accensi@ifremer.fr	Local service desk