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Remote Sens. 2016, 8(9), 707;

Ocean Wave Parameters Retrieval from Sentinel-1 SAR Imagery

Marine Acoustics and Remote Sensing Laboratory, Zhejiang Ocean University, Zhoushan 316000, China
Global Science and Technology, National Oceanic and Atmospheric Administration (NOAA)-National Environmental Satellite, Data, and Information Service (NESDIS), College Park, MD 20740, USA
National Marine Data and Information Service, Tianjin 300171, China
Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security, Hohai University, Nanjing 210000, China
Author to whom correspondence should be addressed.
Academic Editors: Raphael M. Kudela and Prasad S. Thenkabail
Received: 15 April 2016 / Revised: 5 August 2016 / Accepted: 23 August 2016 / Published: 27 August 2016
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In this paper, a semi-empirical algorithm for significant wave height (Hs) and mean wave period (Tmw) retrieval from C-band VV-polarization Sentinel-1 synthetic aperture radar (SAR) imagery is presented. We develop a semi-empirical function for Hs retrieval, which describes the relation between Hs and cutoff wavelength, radar incidence angle, and wave propagation direction relative to radar look direction. Additionally, Tmw can be also calculated through Hs and cutoff wavelength by using another empirical function. We collected 106 C-band stripmap mode Sentinel-1 SAR images in VV-polarization and wave measurements from in situ buoys. There are a total of 150 matchup points. We used 93 matchups to tune the coefficients of the semi-empirical algorithm and the rest 57 matchups for validation. The comparison shows a 0.69 m root mean square error (RMSE) of Hs with a 18.6% of scatter index (SI) and 1.98 s RMSE of Tmw with a 24.8% of SI. Results indicate that the algorithm is suitable for wave parameters retrieval from Sentinel-1 SAR data. View Full-Text
Keywords: significant wave height; mean wave period; Sentinel-1; synthetic aperture radar (SAR) significant wave height; mean wave period; Sentinel-1; synthetic aperture radar (SAR)

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Shao, W.; Zhang, Z.; Li, X.; Li, H. Ocean Wave Parameters Retrieval from Sentinel-1 SAR Imagery. Remote Sens. 2016, 8, 707.

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