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서지반출
Wind Vector Retrieval from SIR-C SAR Data off the East Coast of Korea
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  • Wind Vector Retrieval from SIR-C SAR Data off the East Coast of Korea
  • Wind Vector Retrieval from SIR-C SAR Data off the East Coast of Korea
저자명
Kim. Tai-Sung,Park. Kyung-Ae,Moon. Woo-Il
간행물명
한국지구과학회지
권/호정보
2010년|31권 5호|pp.475-487 (13 pages)
발행정보
한국지구과학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

Sea surface wind field was retrieved from high-resolution SIR-C SAR data by using CMOD algorithms off the east coast of Korea. In order to extract wind direction information from SAR data, a two-dimensional spectral analysis method was applied to the normalized radar cross section of the image. An $180^{circ}$-ambiguity problem in the determination of wind direction was solved by selecting a direction nearest to the wind vector of the ECMWF reanalysis data. Comparison of the wind retrieval patterns with the ECMWF and NCEP/NCAR dataset showed RMS errors in the range of 1.30 to $1.72;ms^{-1}$. In contrast, comparison of wind directions revealed large errors of greater than $60^{circ}$, which is enormously higher than the permitted limit of about $20^{circ}$ for satellite scatterometer winds. Compared with wind speed results from different algorithms, wind vectors based on commonly-used CMOD4 algorithm showed good agreement with those derived by other algorithms such as CMOD_IFR2 and CMOD5, particularly at medium winds from 4 to $8;ms^{-1}$. However, apparent discrepancy appeared at low winds (< $4;ms^{-1}$). This study also addressed an importance of accurate wind direction data to improve the accuracy of wind speed retrieval and discussed potential causes of wind retrieval errors from SAR data.