Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Analysis of Optical Satellite Images and Pyroclastic Flow Inundation Model for Monitoring of Pyroclastic Flow Deposit Area

화성쇄설류 분출 지역의 감시를 위한 광학영상과 화성쇄설류 범람 예측 모델링 분석

  • Cho, Minji (National Institute of Meteorological Research, Korea Meteorological Administration) ;
  • Lee, Saro (Korea Institute of Geosciences and Mineral Resources) ;
  • Lee, Chang-Wook (National Institute of Meteorological Research, Korea Meteorological Administration)
  • Received : 2014.04.07
  • Accepted : 2014.04.16
  • Published : 2014.04.30
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Abstract

Field survey research on damages caused by volcanic activities has plenty of difficulties due to human resources, safety and costs issues. Remote sensing application using satellite image is one of very useful tools to overcome those issues. In this study, we monitored the volcanic activities of Sinabung volcano in 2010, which is located in Sumatra island, Indonesia by using Landsat 7 ETM+ satellite images acquired on 17 April, 2009 and 30 July, 2012. We found that the area of pyroclastic flow inundation after 2010 has been tripled roughly, since extracting the pyroclastic flow inundation before and after 2010 eruption from classification. The result from modeling of pyroclastic flow inundation has been compared with the extracted pyroclastic flow inundation from Landsat 7 ETM+ images. As a result, we confirmed that the length of inundation area from the modeling was calculated to 92% accurate, but the width of inundation area was somewhat imprecisely estimated in the volcanic area having the sharp slope and only calculated to 17% accurate.

화산활동으로 인한 피해를 현장관측을 통해 조사할 경우, 비용과 인력, 안전 등의 문제로 인한 어려움이 많다. 인공위성 영상을 활용한 원격탐사는 이와 같은 문제를 극복하기에 매우 유용한 도구 중에 하나이다. 본 연구에서는 2009년 4월 17일과 2012년 7월 30일에 획득된 Landsat 7 ETM+ 위성 영상을 이용하여 인도네시아 수마트라 섬에 위치한 시나붕 화산의 2010년 화산활동을 관측하였다. 피복분류를 통해 2010년 분화 전 후의 화성쇄설류 범람 지역을 추출한 결과, 2010년 분화로 인해 화성쇄설류 범람 지역의 면적이 약 3배나 증가한 것을 확인하였다. 화성쇄설류 범람 지역 예측 모델링으로 얻어진 결과는 Landsat 영상에서 추출된 화성쇄설류 범람 지역과 비교되었다. 그 결과, 화성쇄설류 범람 지역 예측 모델링은 범람의 거리(길이)는 92%로 정확하게 계산되었지만 화산의 경사가 급격한 지역에서는 범람의 폭이 다소 부정확하게 계산되어 17%의 정확도를 나타내었다.

Keywords

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