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Comparison of Algorithms for Sea Surface Current Retrieval using Himawari-8/AHI Data

Himawari-8/AHI 자료를 활용한 표층 해류 산출 알고리즘 비교

  • Kim, Hee-Ae (Department of Science Education, Seoul National University) ;
  • Park, Kyung-Ae (Department of Earth Science Education/Research Institute of Oceanography/ Center for Education Research, Seoul National University) ;
  • Park, Ji-Eun (Department of Science Education, Seoul National University)
  • 김희애 (서울대학교 과학교육과) ;
  • 박경애 (서울대학교 지구과학교육과/해양연구소/교육종합연구원) ;
  • 박지은 (서울대학교 과학교육과)
  • Received : 2016.12.22
  • Accepted : 2016.12.27
  • Published : 2016.12.31

Abstract

Sea surface currents were estimated by applying the Maximum Cross Correlation (MCC), Zero-mean Sum of Absolute Distances (ZSAD), and Zero-mean Sum of Squared Distances (ZSSD) algorithms to Himawari-8/Advanced Himawari Imager (AHI) thermal infrared channel data, and the comparative analysis was performed between the results of these algorithms. The sea surface currents of the Kuroshio Current region that were retrieved using each algorithm showed similar results. The ratio of errors to the total number of estimated surface current vectors had little difference according to the algorithms, and the time required for sea surface current calculation was reduced by 24% and 18%, relative to the MCC algorithm, for the ZSAD and ZSSD algorithms, respectively. The estimated surface currents were validated against those from satellite-tracked surface drifter and altimeter data, and the accuracy evaluation of these algorithms showed results within similar ranges. In addition, the accuracy was affected by the magnitude of brightness temperature gradients and the time interval between satellite image data.

Himawari-8/Advanced Himawari Imager (AHI) 열적외 채널 자료에 Maximum Cross Correlation (MCC), Zero-mean Sum of Absolute Distances (ZSAD), Zero-mean Sum of Squared Distances (ZSSD) 알고리즘을 적용하여 표층 해류를 산출하고, 그 결과를 비교 분석하였다. 각 알고리즘으로 쿠로시오해류 해역의 표층 해류장을 산출한 결과 서로 유사한 양상을 보였다. 오차 발생 비율은 알고리즘에 따른 차이가 거의 나타나지 않았으며, 표층 해류 산출 연산에 소요되는 시간은 ZSAD와 ZSSD 알고리즘이 MCC 알고리즘에 비해 각각 24%, 18% 감소하였다. 산출된 표층 해류는 인공위성 추적 표층 뜰개 자료와 인공위성 고도계 자료로 계산한 표층 해류를 통해 검증하였고, 세 가지 알고리즘의 정확도는 모두 유사한 범위의 값으로 나타났다. 또한 산출된 표층 해류의 정확도는 휘도 온도 수평 구배의 크기와 두 영상 사이의 시간 간격에 의해 영향을 받았다.

Keywords

References

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  1. 다목적실용위성 영상자료 활용 현황 vol.34, pp.6, 2016, https://doi.org/10.7780/kjrs.2018.34.6.3.1