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http://dx.doi.org/10.7780/kjrs.2019.35.6.4.7

Improvement of KOMPSAT-5 Sea Surface Wind with Correction Equation Retrieval and Application of Backscattering Coefficient  

Jang, Jae-Cheol (Department of Science Education, Seoul National University)
Park, Kyung-Ae (Department of Earth Science Education, Seoul National University)
Yang, Dochul (Satellite Operation and Application Center, Korea Aerospace Research Institute)
Lee, Sun-Gu (Satellite Application Devision, Korea Aerospace Research Institute)
Publication Information
Korean Journal of Remote Sensing / v.35, no.6_4, 2019 , pp. 1373-1389 More about this Journal
Abstract
KOMPSAT-5 is the first satellite in Korea equipped with X-band Synthetic Aperture Radar (SAR) instrument and has been operated since August 2013. KOMPSAT-5 is used to monitor the global environment according to its observation purpose and the availability of KOMPSAT-5 is also highlighted as the need of high resolution wind data for investigating the coastal region. However, the previous study for the validation of wind derived from KOMPSAT-5 showed that the accuracy is lower than that of other SAR satellites. Therefore, in this study, we developed the correction equation of normalized radar cross section (NRCS or backscattering coefficient) for improvement of wind from the KOMPSAT-5 and validated the effect of the equation using the in-situ measurement of ocean buoys. Theoretical estimated NRCS and observed NRCS from KOMPSAT-5 showed linear relationship with incidence angle. Before applying the correction equation, the accuracy of the estimated wind speed showed the relatively high root-mean-square errors (RMSE) of 2.89 m s-1 and bias of -0.55 m s-1. Such high errors were significantly reduced to the RMSE of 1.60 m s-1 and bias of -0.38 m s-1 after applying the correction equation. The improvement effect of the correction equation showed dependency relying on the range of incidence angle.
Keywords
Sea surface wind; SAR (Synthetic Aperture Radar); Correction equation of backscattering coefficient; KOMPSAT-5;
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Times Cited By KSCI : 4  (Citation Analysis)
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