Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Analysis on the Changes of Remote Sensing Indices on Each Land Cover Before and After Heavy Rainfall Using Multi-temporal Sentinel-2 Satellite Imagery and Daily Precipitation Data

다중시기 Sentinel-2 위성영상과 일강수량 자료를 활용한 집중호우 전후의 토지피복별 원격탐사지수 변화 분석

  • 김경섭 ((주)지오씨엔아이 공간정보기술연구소) ;
  • 문갑수 ((주)지오씨엔아이 공간정보기술연구소) ;
  • 정윤재 ((주)지오씨엔아이 공간정보기술연구소)
  • Received : 2020.05.27
  • Accepted : 2020.06.05
  • Published : 2020.06.30
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Abstract

Recently, a lot of damages have been caused by urban flooding, and heavy rainfall that temporarily occur are the main causes of these phenomenons. The damages caused by urban flooding are identified as the change in the water balance in urban areas. To indirectly identify it, this research analyzed the change in the remote sensing indices on each land cover before and after heavy rainfall by utilizing daily precipitation data and multi-temporal Sentinel-2 satellite imagery. Cases of heavy rain advisory and warning were selected based on the daily precipitation data. And statistical fluctuation were compared by acquiring Sentinel-2 satellite images during the corresponding period and producing them as NDVI, NDWI and NDMI images about each land cover with a radius of 1,000 m based on the Seoul Weather Station. As a result of analyzing the maximum value, minimum value, mean and fluctuation of the pixels that were calculated in each remote sensing index image, there was no significant changes in the remote sensing indices in urban areas before and after heavy rainfall.

최근 도시홍수에 의해 많은 피해가 발생하고 있으며, 단시간에 국지적으로 발생하는 집중호우가 1차 원인으로 꼽히고 있다. 도시홍수의 피해는 도시지역 내 물수지의 변화로 규명하고 있으며, 이를 간접적으로 파악하기 위해 일강수량 자료와 다중시기 Sentinel-2 위성영상을 활용해 집중호우 전후의 토지피복별 원격탐사지수 변화를 분석하였다. 일강수량 자료를 바탕으로 호우주의보 및 경보의 사례를 선정하였고, 해당 기간의 Sentinel-2 위성영상을 취득해 이를 기상청 서울관측소 기준 반경 1,000m 범위의 정규식생지수(NDVI), 정규수분지수(NDWI) 및 정규습윤지수(NDMI) 영상을 토지피복별로 제작하여 통계적 변화를 비교하였다. 각 영상을 구성하고 있는 픽셀의 최댓값, 최솟값, 평균 및 그 증감을 분석한 결과, 집중호우 전후 도시지역 원격탐사지수에 유의미한 변화가 발생한 것으로 보기는 힘들다고 판단하였다.

Keywords

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