| Retrieval of Significant Wave Height Under Typhoon Conditions from Gaofen-3 SAR Imagery |
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| 作者姓名： | WANG Xiaochen HAN Bing ZHONG Lihua YUAN Xinzhe |
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| 作者单位： | Aerospace Information Research Institute,Chinese Academy of Science,Beijing 100190,China;Key Laboratory of Technology in Geo-Spatial Information Processing and Application Systems,Aerospace Information Research Institute,Chinese Academy of Science,Beijing 100190,China;The National Satellite Ocean Applications Center,Beijing 100081,China |
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| 基金项目： | by the National Natural Science Foundation of China(No.4197060692). |
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| 摘 要： | The objective of this paper is to propose an empirical method to inverse significant wave height(SWH)under typhoon conditions from collected dual-polarization Gaofen(GF)-3 synthetic aperture radar(SAR)imagery.The typhoon scenes were cap-tured from narrow scan(NSC)and wide scan(WSC)images,and collocated with European Center for Medium-Range Weather Fore-casts reanalysis data of(ECMWF).To improve the quality of GF-3 SAR images,the recalibration over rainforest and de-scalloping were carried out.To establish the empirical relationship between SAR-derived parameters and collocated SWH,the sensitivity analysis of typical parameters about the normalized radar cross section(Nrcs)and imagery variance(Cvar)were performed to both VV and VH polarized images.Four scenes from GF-3 SAR imagery under typhoon conditions were used for training the model by the multivari-ate least square regression,and one scene was used for preliminary validation.It was found that the joint retrieval model based on VV and VH polarized SAR imagery performed better than any single polarized model.These results,verified by using ECMWF data,revealed the soundness of this approach,with a correlation of 0.95,bias of 0 m,RMSE of 0.44 and SI of 0.01 when VV polarization and VH polarization data were both used.
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| 关 键 词： | Gaofen-3 SAR TYPHOON significant wave height |
Retrieval of Significant Wave Height Under Typhoon Conditions from Gaofen-3 SAR Imagery |
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| WANG Xiaochen,HAN Bing,ZHONG Lihua,YUAN Xinzhe.Retrieval of Significant Wave Height Under Typhoon Conditions from Gaofen-3 SAR Imagery[J].Journal of Ocean University of China,2022,21(1):81-90. |
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| Authors: | WANG Xiaochen HAN Bing ZHONG Lihua YUAN Xinzhe |
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| Abstract: | The objective of this paper is to propose an empirical method to inverse significant wave height (SWH) under typhoon conditions from collected dual-polarization Gaofen (GF)-3 synthetic aperture radar (SAR) imagery. The typhoon scenes were cap-tured from narrow scan (NSC) and wide scan (WSC) images, and collocated with European Center for Medium-Range Weather Fore-casts reanalysis data of (ECMWF). To improve the quality of GF-3 SAR images, the recalibration over rainforest and de-scalloping were carried out. To establish the empirical relationship between SAR-derived parameters and collocated SWH, the sensitivity analysis of typical parameters about the normalized radar cross section (Nrcs) and imagery variance (Cvar) were performed to both VV and VH polarized images. Four scenes from GF-3 SAR imagery under typhoon conditions were used for training the model by the multivari-ate least square regression, and one scene was used for preliminary validation. It was found that the joint retrieval model based on VV and VH polarized SAR imagery performed better than any single polarized model. These results, verified by using ECMWF data, revealed the soundness of this approach, with a correlation of 0.95, bias of 0 m, RMSE of 0.44 and SI of 0.01 when VV polarization and VH polarization data were both used. |
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| Keywords: | Gaofen-3 SAR typhoon significant wave height |
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