The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
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Analysis on optical property in the South Sea of Korea by using Satellite Image : Study of Case on red tide occurrence in August 2013

위성영상을 활용한 한국 남해의 광학적 특성 연구 : 2013년 8월 발생한 적조 사례를 중심으로

  • Bak, Su-Ho ;
  • Yoon, Hong-Joo (Divsion of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University)
  • 박수호 (부경대학교 지구환경시스템과학부) ;
  • 윤홍주 (부경대학교 지구환경시스템과학부)
  • Received : 2016.06.28
  • Accepted : 2016.07.24
  • Published : 2016.07.31
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Abstract

This study is analyzed the optical property of red tide pixel by using Landsat-7 ETM+, Landsat-8 OLI and COMS/GOCI image. In order to sample red tide pixel, Landsat-7, 8 true color image were used and obtained coordinate of red tide pixel in the true color image. Normalized water leaving radiance(nLw) and absorption coefficient were obtained from GOCI image in the same coordinate of the true color image. When red tide was not occurred the main absorption range was 412nm and 660nm but when red tide occurred it was 660nm and absorption coefficient in 412nm are drastically reduced. It made no difference of nLw spectrum between red tide pixel and non red tide pixel in nLw, but the absolute value of nLw was low than non red tide pixel, especially 660nm and 680nm wavelength sharply decrease.

본 연구에서는 Landsat-7 ETM+, Landsat-8 OLI 영상과 COMS/GOCI 영상을 이용하여 적조 픽셀의 광학적 특성을 분석하였다. 적조 픽셀을 샘플링하기 위해 Landsat-7, 8 True Color 영상을 활용하였으며, 영상에서 적조 픽셀의 좌표를 획득하였다. 획득된 픽셀의 좌표를 참조하여 동일 해역의 GOCI 영상을 통해 해당픽셀의 흡광 및 수출광량 자료를 획득하였다. 적조가 발생하지 않은 경우 412nm와 660nm 파장대에서 주흡광을 보인 것에 비해 적조 픽셀의 경우 660nm에서 주흡광을 보였으며, 412nm에서는 흡광량이 현저히 줄어든 것을 확인하였다. 수출광량의 경우 스펙트럼 형태에서는 큰 차이가 없었으나, 수출광량의 절대값이 적조 픽셀의 경우 낮게 나타났으며, 특히 660nm와 680nm 파장대에서 수출광량 감소가 크게 나타났다.

Keywords

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