Assessment of Sea-Surface Wind Retrieval from C-Band Miniaturized SAR Imagery
Author:
Wang Yan12, Li Yan3, Xie Yanshuang12, Wei Guomei12, He Zhigang12, Geng Xupu145ORCID, Shang Shaoping12
Affiliation:
1. College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China 2. Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Minister of Education, Xiamen University, Xiamen 361005, China 3. Dongshan Swire Marine Station, Xiamen University, Xiamen 361005, China 4. Engineering Research Center of Ocean Remote Sensing Big Data, Fujian Province University, Xiamen 361102, China 5. State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
Abstract
Synthetic aperture radar (SAR) has been widely used for observing sea-surface wind fields (SSWFs), with many scholars having evaluated the performance of SAR in SSWF retrieval. Due to the large systems and high costs of traditional SAR, a tendency towards the development of smaller and more cost-effective SAR systems has emerged. However, to date, there has been no evaluation of the SSWF retrieval performance of miniaturized SAR systems. This study utilized 1053 HiSea-1 and Chaohu-1 miniaturized SAR images covering the Southeast China Sea to retrieve SSWFs. After a quality control procedure, the retrieved winds were subsequently compared with ERA5, buoy, and ASCAT data. The retrieved wind speeds demonstrated root mean square errors (RMSEs) of 2.42 m/s, 1.64 m/s, and 3.29 m/s, respectively, while the mean bias errors (MBEs) were found to be −0.44 m/s, 1.08 m/s, and −1.65 m/s, respectively. Furthermore, the retrieved wind directions exhibited RMSEs of 11.5°, 36.8°, and 41.7°, with corresponding MBEs of −1.3°, 2.4°, and −8.8°, respectively. The results indicate that HiSea-1 and Chaohu-1 SAR satellites have the potential and practicality for SSWF retrieval, validating the technical indicators and performance requirements implemented during the satellites’ design phase.
Funder
the Industry-University Cooperation and Collaborative Education Projects Ministry of Education, Marine Economic Development Subsidy Project of Fujian Fujian marine economic development special fund project Fujian Provincial Department of Ocean and Fisheries, and Fujian science and technology Major special project Fujian Provincial Department of Science and Technology
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
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