Journal of the Korean Society of Mineral and Energy Resources Engineers (한국자원공학회지)

The Korean Society of Mineral and Energy Resources Engineers (한국자원공학회)
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Limestone Mapping in Gangwon Area, South Korea Using EO-1 Hyperion Hyperspectral Satellite Imagery

EO-1 Hyperion 초다분광 위성영상을 이용한 강원도 지역 석회암 탐지

  • Hyun, Chang-Uk (Department of Earth and Atmospheric Sciences, University of Alberta) ;
  • Park, Hyeong-Dong (Department of Energy Systems Engineering, Seoul National University)
  • Published : 2013.02.28
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Abstract

This study presents approaches for limestone mapping in Gangwon area using EO-1 Hyperion hyperspectral satellite imagery. Limestone potential index formula was developed for fast and effective limestone detection, with utilization of intrinsic spectral absorption features within short-wave infrared wavelength region selected in reflectance spectra of carbonate minerals and spectra measured on samples collected in field. The limestone potential index was mapped on water, vegetation and snow land-covers removed area, and limestone open-pit mining sites, exposed slopes around road, vegetation removed construction sites, and few bare ground areas showed high index values. To apply partial unmixing matched filtering method for sub-pixel abundance mapping, spectrally pure end-member was extracted from the imagery. The partial unmixing result showed similar limestone distribution to the limestone potential index mapping result but slightly improved, with verification using high-spatial-resolution aerial photographs.

본 연구에서는 EO-1 Hyperion 초다분광 위성영상을 사용하여 강원도 지역을 대상으로 석회암 탐지를 수행하였다. 지표 석회암 탐지를 위하여 탄산염 광물 분광반사도의 단파장적외선 영역에서 나타나는 고유한 흡광특성을 이용하여 신속하고 효과적으로 석회암 분포를 강조할 수 있는 석회암 잠재지수를 개발하였다. 영상의 전처리 단계에서 수계, 식생 및 눈 피복이 제거된 영역에 한정하여 석회암 잠재지수 지도를 작성한 결과 석회암 노천채광 현장, 도로변 암반노출 사면, 식생이 제거된 건설현장 및 일부 나대지에서 높은 잠재지수가 나타났다. 분광학적으로 순수한 석회암 반사도를 영상에서 추출하고 탐지 대상의 화소 내 분포비율을 산정할 수 있는 부분 분광혼합 분석기법인 정합 필터링의 기준자료로 사용하였다. 부분 분광혼합 분석결과에서 석회암 잠재지수 분석결과와 유사한 지점에서 석회암의 분포가 강조되었지만 고해상도 항공사진과의 비교분석을 통하여 석회암 잠재지수보다 정밀한 탐지가 수행되었음을 확인하였다.

Keywords

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