• Title/Summary/Keyword: infrared satellite image

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Introduction of GOCI-II Atmospheric Correction Algorithm and Its Initial Validations (GOCI-II 대기보정 알고리즘의 소개 및 초기단계 검증 결과)

  • Ahn, Jae-Hyun;Kim, Kwang-Seok;Lee, Eun-Kyung;Bae, Su-Jung;Lee, Kyeong-Sang;Moon, Jeong-Eon;Han, Tai-Hyun;Park, Young-Je
    • Korean Journal of Remote Sensing
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    • v.37 no.5_2
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    • pp.1259-1268
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    • 2021
  • The 2nd Geostationary Ocean Color Imager (GOCI-II) is the successor to the Geostationary Ocean Color Imager (GOCI), which employs one near-ultraviolet wavelength (380 nm) and eight visible wavelengths(412, 443, 490, 510, 555, 620, 660, 680 nm) and three near-infrared wavelengths(709, 745, 865 nm) to observe the marine environment in Northeast Asia, including the Korean Peninsula. However, the multispectral radiance image observed at satellite altitude includes both the water-leaving radiance and the atmospheric path radiance. Therefore, the atmospheric correction process to estimate the water-leaving radiance without the path radiance is essential for analyzing the ocean environment. This manuscript describes the GOCI-II standard atmospheric correction algorithm and its initial phase validation. The GOCI-II atmospheric correction method is theoretically based on the previous GOCI atmospheric correction, then partially improved for turbid water with the GOCI-II's two additional bands, i.e., 620 and 709 nm. The match-up showed an acceptable result, with the mean absolute percentage errors are fall within 5% in blue bands. It is supposed that part of the deviation over case-II waters arose from a lack of near-infrared vicarious calibration. We expect the GOCI-II atmospheric correction algorithm to be improved and updated regularly to the GOCI-II data processing system through continuous calibration and validation activities.