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Evaluating ocean wave spectra derived from quad-polarized GF-3 wave mode SAR images against buoys
Author(s): He Wang; Jing Wang; Biao Zhang; Jianhua Zhu
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Paper Abstract

In 2016, the first Chinese synthetic aperture radar (SAR), the Gaofen-3 (GF-3) satellite, was launched. Unlike the single-polarized wave mode SARs in Europe, GF-3 is the first satellite acquiring the quad-polarized SAR data in wave mode configuration, which could benefit the ocean wave estimation. Here, the ocean wave spectra estimation from quad-polarized GF-3 wave mode is presented and its performances are evaluated. For the period from January to October in 2017, the ocean wave spectra were inverted from GF-3 wave mode data. The quad-polarized SAR-ocean spectra inversion scheme was utilized, in which the azimuthal and range wave slopes are obtained from the vertically and linearly polarized normalized radar cross sections and then converted to ocean wave slope spectra. The validation was also performed through comparisons against directional wave buoy observations. The spatio-temporal criteria of 100 km and 0.5 h, yield 87 matchups. Two representative cases illustrate the consistency between the GF-3 SAR ocean wave spectra and buoy measurements. Statistical assessment shows the root mean square error (RMSE) of 0.35 m, 19.52 m and 24.89° for the significant wave height, peak wavelength and wave direction, respectively. Evaluation results indicate that the quad-polarized algorithm is suitable for spectral ocean wave estimation from GF-3 wave mode, and encouraging for operational implementation.

Paper Details

Date Published: 14 October 2019
PDF: 7 pages
Proc. SPIE 11150, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2019, 111500G (14 October 2019); doi: 10.1117/12.2532683
Show Author Affiliations
He Wang, National Ocean Technology Ctr. (China)
Jing Wang, Shanghai Lizheng Satellite Application Technology Co., Ltd. (China)
Biao Zhang, Nanjing Univ. of Information Science and Technology (China)
Jianhua Zhu, National Ocean Technology Ctr. (China)


Published in SPIE Proceedings Vol. 11150:
Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2019
Charles R. Bostater Jr.; Xavier Neyt; Françoise Viallefont-Robinet, Editor(s)

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