Significant Wave Height Retrieval from Gaofen-3 Wave Mode Images
Significant Wave Height Retrieval from Gaofen-3 Wave Mode Images
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DOI：
10.1109/igarss.2018.8518057
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发表时间：
2018-07
期刊：
影响因子：
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通讯作者：
Jing Wang;He Wang;W. Shao;Jianhua Zhu;Xinzhe Yuan
中科院分区：
文献类型：
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作者：
Jing Wang;He Wang;W. Shao;Jianhua Zhu;Xinzhe Yuan
有效波高（Hs）是一个重要的参数，用方向波谱的积分表示。虽然许多研究者已经直接从SAR图像中提取了$H_{s}$，并取得了很高的反演精度，但这些方法并不适用于GF-3 SAR数据。本文提出了一种经验的SAR H_{s}$反演方法，该方法利用不同波束下VV极化的高芬3号（GF-3）波模数据（称为波码）得到的图像互谱的真实的部分估计$\lambda_{c}$。使用2017年1月至2月GF-3波模数据的结果表明，偏差和RMSE误差分别为：189波码，-0.13 m和0.57 m; 190波码，-0.07 m和0.34 m; 193波码，-0.3 m和0.59 m; 199波码，0.16 m和0.68 m; 215波码，0.2米和0.87米。它们示出了所检索的$H_{s}$和从WAVEWATCH-III（WW 3）提取的$H_{s}$之间的相对行为。然而，当WW 3提取的$H_{s}$超过4 m时，存在显著的误差。在高海况下，该模式似乎不适合H_{s}$的反演。
Significant wave height $(H_{s})$, is an important parameter, represented as the integration of directional wave spectra. Although many researchers have directly extracted $H_{s}$ from SAR images and got a great accuracy of retrieval, those approaches are not suitable for GF-3 SAR data. In this paper, we propose an empirical approach for SAR $H_{s}$ retrieval, using $\lambda_{c}$ estimated from the real part of image cross spectra obtain from VV-polarized Gaofen-3 (GF-3) wave mode data acquired in different radar beams (called wave-code). Results using GF-3 wave mode data from January to February 2017 indicate that the bias and RMSE errors are: 189 wave-code, −0.13 m and 0.57 m; 190 wave-code, −0.07 m and 0.34 m; 193 wave-code, −0.3 m and 0.59 m; 199 wave-code, 0.16 m and 0.68 m; 215 wave-code, 0.2 m and 0.87 m. they show a relative behavior between the retrieved $H_{s}$ and the $H_{s}$ extracted from WAVEWATCH-III (WW3). However, there is a significant error when WW3-extracted $H_{s}$ exceed 4 m. It seems that the model is not suitable for $H_{s}$ retrieval on high sea conditions.