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In this study, a multi-spectral ASTER image was analyzed to extract the spectral characteristics of hydrothermal alteration pyrophyllite deposit in Nohwa island. The band ratio and Principal Component Analysis (PCA) were used for this study. The Nohwa deposit showed strong absorption features in the ASTER band 5 (2.145～2.185 ㎛) and 6 (2.185～2.225 ㎛), which implies that the deposit is mainly composed of hydrothermal altered clay minerals containing Al-OH. The PCA using a covariance matrix was effective in compressing information content and removing noise. In addition, experiment showed that the PCA using four bands selected from the ASTER Visible Near Infrared Region (VNIR) and Short Wave Infrared Region (SWIR) bands is more useful than the band ratio to analyze the spectral characteristics of the pyrophyllite deposit in Nohwa island.
본 연구에서는 다중분광(multi-spectral) 원격탐사 영상 중 ASTER(Advanced Spaceborne Thermal Emission and Reflectance radiometer) 영상을 이용하여 노화도에 분포되어 있는 열수변질 납석광상 지역의 분광학적 특성을 분석하였다. 노화광상 지역의 분광학적 특성 분석을 위해 영상처리기법 중 밴드비율 기법과 주성분 분석 기법을 적용하였으며, 분석결과 노화광상은 ASTER 5번(2.145～2.185 ㎛)과 6번(2.185～2.225 ㎛) 밴드에 해당되는 분광대역에서 강한 흡수특성을 나타냈다. 따라서 이 지역은 주로 Al-OH 광물인 열수변질 점토광물들로 이루어진 지역으로 판단된다. 공분산 행렬식을 이용한 주성분 분석은 정보의 압축 및 잡음 제거에 효과적이었으며, 입력밴드를 ASTER 가시･근적외대역과 단파장 적외대역 밴드 9개 중 4개 밴드를 선택하여 주성분 변환을 수행한 결과, 밴드비율 기법에 비해 광상지역의 분광학적 특성을 보다 효과적으로 확인할 수 있었다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 48
- No :3
- Pages :335-350
Journal of the Korean Society of Mineral and Energy Resources Engineers
