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A Low-Cost Stereo Video System for Measuring Directional Wind Waves

Ocean Engineering Program, Rio de Janeiro Federal University, Rio de Janeiro 20211-040, Brazil
France Énergies Marines, Plouzané, France and PPGOceano, Federal University of Santa Catarina, Florianópolis 88040-900, Brazil
Istituto di Scienze Marine (ISMAR), Consiglio Nazionale delle Ricerche (CNR), 40129 Bologna, Italy
DAIS, Università Ca’ Foscari, 30172 Venice, Italy
Author to whom correspondence should be addressed.
Current address: Centre for Marine Technology and Ocean Engineering, University of Lisbon, 1049-001 Lisbon, Portugal.
These authors contributed equally to this work.
J. Mar. Sci. Eng. 2020, 8(11), 831;
Received: 18 September 2020 / Revised: 14 October 2020 / Accepted: 16 October 2020 / Published: 22 October 2020
(This article belongs to the Special Issue Spatially Distributed Sea Wave Measurements)
Typical oceanographic instruments are expensive, complex to build, and hard to deploy and require constant and specialized maintenance. In this paper, we present a cheap and simple technique to estimate a three-dimensional surface elevation map, η(x,y,t), the directional spectrum, and the main sea state parameters using inexpensive smartphones. The proposed methodology uses Time Lagged Cross Correlation (TLCC) between the audio signals from two independent video records to perform the frame synchronization. This makes the system much easier to deploy, where the main requirement is a fixed or moving platform close to the sea. The time records are mostly limited by the equipment storage space and battery life, although it can be easily replaced or recharged. Here, we pose the basis for an inexpensive yet powerful stereo reconstruction device and discuss its capabilities and limitations. The smartphone system capabilities were illustrated here by near shore experiment, at Leme beach in the Southeast of Brazil, and the results were compared against a pressure sensor. For this particular setup, the root mean square error in terms of significant wave height is of the order of 11% with perfect estimation of the peak period. The results are promising and demonstrate the validity and applicability of the technique. View Full-Text
Keywords: low-cost wave observation; stereo video; smartphones low-cost wave observation; stereo video; smartphones
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MDPI and ACS Style

Vieira, M.; Guimarães, P.V.; Violante-Carvalho, N.; Benetazzo, A.; Bergamasco, F.; Pereira, H. A Low-Cost Stereo Video System for Measuring Directional Wind Waves. J. Mar. Sci. Eng. 2020, 8, 831.

AMA Style

Vieira M, Guimarães PV, Violante-Carvalho N, Benetazzo A, Bergamasco F, Pereira H. A Low-Cost Stereo Video System for Measuring Directional Wind Waves. Journal of Marine Science and Engineering. 2020; 8(11):831.

Chicago/Turabian Style

Vieira, Matheus, Pedro Veras Guimarães, Nelson Violante-Carvalho, Alvise Benetazzo, Filippo Bergamasco, and Henrique Pereira. 2020. "A Low-Cost Stereo Video System for Measuring Directional Wind Waves" Journal of Marine Science and Engineering 8, no. 11: 831.

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