[논문]경기도 지역에 대한 MODIS 위성영상 및 지점자료기반 가뭄지수의 비교·분석

강유진; 김형수; 김동현; 왕원준; 이하늘; 서민호; 정윤재

doi:10.11108/kagis.2022.25.4.001

경기도 지역에 대한 MODIS 위성영상 및 지점자료기반 가뭄지수의 비교·분석
Comparison and Analysis of Drought Index based on MODIS Satellite Images and ASOS Data for Gyeonggi-Do 원문보기

한국지리정보학회지 = Journal of the Korean Association of Geographic Information Studies, v.25 no.4, 2022년, pp.1 - 18

강유진 (인하대학교 대학원 토목공학과) , 김형수 (인하대학교 사회인프라공학과) , 김동현 (인하대학교 대학원 스마트시티공학과) , 왕원준 (인하대학교 대학원 스마트시티공학과) , 이하늘 (인하대학교 대학원 스마트시티공학과) , 서민호 ((주)지오씨엔아이 공간정보기술연구소) , 정윤재 ((주)지오씨엔아이 공간정보기술연구소)

초록
AI-Helper

현재 우리나라 기상청에서는 6개월 누적강수량 기준인 SPI6(standardized precipitation index 6)을 이용하여 기상가뭄을 지역별로 평가하고 있다. 하지만, SPI는 69개 기상관측소의 강수량만을 고려하여 산정되는 지수로 복합적인 이유로 나타나는 가뭄사상은 정확하게 판단하지 못하고 있는 실정이다. 따라서, 본 연구의 목적은 강수량만을 고려한 SPI와 강수량, 식생지수 및 기온을 복합적으로 고려하는 SDCI(Scaled Drought Condition Index)를 경기도 지역을 대상으로 산정 및 비교하고자 하였다. 또한, SPI와 SDCI의 비교를 통해 산정된 결과를 활용하여 지점자료기반 가뭄지수와 위성영상기반 가뭄지수의 장단점을 파악하고자 하였다. SDCI를 산정하기 위해 MODIS(MODerate resolution Imaging Spectroradiometer) 위성영상자료, 종관기상관측(ASOS) 자료 및 크리깅 기법을 사용하였다. 강수량의 지속기간은 2014년의 8개 시점에 대해 1개월, 3개월, 6개월을 각각 적용하여 SDCI1, SDCI3, SDCI6을 산정하였다. SDCI 산정 결과, SPI와 달리 약 두달 전부터 가뭄양상을 나타내기 시작하여 경기도 시군별 가뭄에 대해서 잘 드러냈다. 이를 통해, 위성영상자료와 지점자료의 결합이 가뭄지수 변화 양상에 있어서 효율성을 높였으며, 기존의 건조 지역과 더불어 습윤 지역에 대해 가뭄예측 가능성을 증대시켰음을 파악할 수 있었다.

Abstract ▼ AI-Helper

Currently, the Korea Meteorological Administration evaluates the meteorological drought by region using SPI6(standardized precipitation index 6), which is a 6-month cumulative precipitation standard. However, SPI is an index calculated only in consideration of precipitation at 69 weather stations, and the drought phenomenon that appears for complex reasons cannot be accurately determined. Therefore, the purpose of this study is to calculate and compare SPI considering only precipitation and SDCI (Scaled Drought Condition Index) considering precipitation, vegetation index, and temperature in Gyeonggi. In addition, the advantages and disadvantages of the station data-based drought index and the satellite image-based drought index were identified by using results calculated through the comparison of SPI and SDCI. MODIS(MODerate resolution Imaging Spectroradiometer) satellite image data, ASOS(Automated Synoptic Observing System) data, and kriging were used to calculate SDCI. For the duration of precipitation, SDCI1, SDCI3, and SDCI6 were calculated by applying 1-month, 3-month, and 6-month respectively to the 8 points in 2014. As a result of calculating the SDCI, unlike the SPI, drought patterns began to appear about 2-month ago, and drought by city and county in Gyeonggi was well revealed. Through this, it was found that the combination of satellite image data and station data increased efficiency in the pattern of drought index change, and increased the possibility of drought prediction in wet areas along with existing dry areas.

주제어

표/그림 (15)

그림 FIGURE 1. The administrative district map of Gyeonggi
그림 FIGURE 2. The ASOS station location and Thiessen polygon
그림 FIGURE 3. SPI1 calculated by applying the 1-month cumulative precipitation at 8 time points in 2014 in Gyeonggi
그림 FIGURE 4. SPI3 calculated by applying the 3-month cumulative precipitation at 8 time points in 2014 in Gyeonggi
그림 FIGURE 5. SPI6 calculated by applying the 6-month cumulative precipitation at 8 time points in 2014 in Gyeonggi
표 TABLE 1. SPI1 ranking by 8 time points in 2014 in Gyeonggi
표 TABLE 2. SPI3 ranking by 8 time points in 2014 in Gyeonggi
표 TABLE 3. SPI6 ranking by 8 time points in 2014 in Gyeonggi
표 TABLE 4. Classification of water storage rates by city, county, and district in Gyeonggi
그림 FIGURE 6. SDCI1 calculated by applying the 1-month cumulative precipitation(PCI1) at 8 time points in 2014 in Gyeonggi
그림 FIGURE 7. SDCI3 calculated by applying the 3-month cumulative precipitation(PCI3) at 8 time points in 2014 in Gyeonggi
그림 FIGURE 8. SDCI6 calculated by applying the 6-month cumulative precipitation(PCI6) at 8 time points in 2014 in Gyeonggi
표 TABLE 5. SDCI1 ranking by 8 time points in 2014 in Gyeonggi
표 TABLE 6. SDCI3 ranking by 8 time points in 2014 in Gyeonggi
표 TABLE 7. SDCI6 ranking by 8 time points in 2014 in Gyeonggi

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