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2026 Vol.59, Issue 9 Preview Page

Research Article

Assessing delayed vegetation responses to agricultural drought using time-series planetscope imagery

시계열 PlanetScope 영상을 활용한 농업가뭄 식생 반응 및 지연 특성 분석

Hyeok-Jae Choia
,
Won-Ho Namb*
,
Hee-Jin Leec
,
Min-Gi Jeond
,
Jeonghwan Parke
,
Eunmi Hongf
,
Minkyu Moong
최 혁재a
,
남 원호b*
,
이 희진c
,
전 민기d
,
박 정환e
,
홍 은미f
,
문 민규g
aGraduate Student, School of Social Safety and Systems Engineering, Hankyong National University, Anseong, Korea
bProfessor, School of Social Safety and Systems Engineering, Institute of Agricultural Environmental Science, National Agricultural Water Research Center, Hankyong National University, Anseong, Korea
cSenior Researcher, National Agricultural Water Research Center, Hankyong National University, Anseong, Korea
dPostdoctoral Researcher, Department of Hydro Science and Engineering Research, Korea Institute of Civil Engineering and Building Technology (KICT), Goyang, Korea
eSupport Scientist, Hydrological Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
fAssociate Professor, Interdisciplinary Program in Earth Environmental System Science & Engineering, Kangwon National University, Chuncheon, Korea
gAssistant Professor, Department of Environmental Science, College of Agriculture and Life Sciences, Kangwon National University, Chuncheon, Korea
a한경국립대학교 사회안전시스템공학부 석사과정
b한경국립대학교 사회안전시스템공학부 교수
c한경국립대학교 국가농업용수연구센터 선임연구원
d한국건설기술연구원 수자원하천연구본부 박사후연구원
eSupport Scientist, Hydrological Sciences Laboratory, NASA Goddard Space Flight Center
f강원대학교 지오에코시스템융합학과 부교수
g강원대학교 농업생명과학대학 생명환경융합학부 조교수
*Corresponding Author
30 September 2026. pp. 1033-1047
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Abstract

Recent climate change has increased the frequency and severity of droughts, resulting in intensified agricultural damage. In particular, upland crops that rely primarily on rainfall are highly vulnerable to drought stress and may experience substantial reductions in productivity. This study investigated the potential of high-resolution PlanetScope time-series imagery for agricultural drought monitoring in South Korea. Using PlanetScope imagery acquired over Changnyeong-gun, Gyeongsangnam-do, in 2018, NDVI, EVI2, GNDVI, and SAVI were derived and compared with MODIS vegetation indices to evaluate their temporal consistency and response characteristics. In addition, the Vegetation Condition Index (VCI) and Standardized Vegetation Index (SVI) were calculated from the vegetation index time series, and the first date satisfying both drought-threshold conditions was defined as the vegetation drought response date. The results showed that NDVI, EVI2, and SAVI exhibited high coefficients of determination with MODIS, while GNDVI also showed statistically significant relationships. The detected vegetation drought response occurred approximately 64-70 days after the end of the reference drought period, indicating a delayed decline in vegetation condition that may reflect both accumulated water stress and seasonal vegetation dynamics. These findings suggest that PlanetScope-based vegetation indices can support the analysis of delayed vegetation-condition changes within the study area, although the detected responses may reflect both cumulative water stress and seasonal vegetation dynamics.

Keywords
Agricultural drought
PlanetScope imagery
Vegetation indices
Drought response
Time-series analysis

최근 기후변화의 영향으로 가뭄의 발생 빈도와 강도가 증가하면서 농업 피해가 확대되고 있다. 특히 국내 밭 농업은 물 공급을 주로 강우에 의존하고 있어 가뭄에 매우 취약하며, 필지 규모가 작은 국내 농업 환경에서는 중·저해상도 위성자료만으로 농경지 단위의 식생 변화를 정밀하게 파악하는 데 한계가 있다. 이에 따라 본 연구에서는 고해상도 PlanetScope 시계열 영상을 활용하여 국내 농업가뭄 모니터링 적용 가능성과 식생 기반 가뭄 반응 특성을 분석하였다. 연구 대상 지역은 경상남도 창녕군으로 선정하였으며, 2018년 PlanetScope 영상으로부터 NDVI, EVI2, GNDVI, SAVI를 산정하였다. 또한 동일 시기의 MODIS 식생지수와 비교하여 PlanetScope 기반 식생지수의 시계열 일관성과 반응 특성을 검토하였다. 더불어 Vegetation Condition Index (VCI)와 Standardized Vegetation Index (SVI)를 산정하고, 두 임계조건을 동시에 만족하는 최초 시점을 식생 기반 가뭄 반응 시점으로 정의하여 기준 가뭄 기간과 비교하였다. 분석 결과, NDVI, EVI2, SAVI는 MODIS와 높은 결정계수를 나타냈으며, GNDVI 역시 통계적으로 유의한 관계를 보였다. 또한 식생 기반 가뭄 반응 시점은 기준 가뭄 종료 이후 약 64∼70일의 지연을 두고 나타났으며, 이는 산정된 식생 저하 시점이 기준기간 이후 일정한 시차를 두고 나타났음을 보여주며, 누적 수분 스트레스와 계절적 생육 변화가 함께 반영되었을 가능성이 있다. 본 연구 결과는 PlanetScope 기반 식생지수가 연구지역 농경지의 평균적인 식생 변화와 가뭄 반응 시점을 분석하기 위한 자료로 활용될 가능성을 보여준다.

키워드
농업가뭄
PlanetScope 영상
식생지수
식생 반응
Vegetation Condition Index (VCI)
Standardized Vegetation Index (SVI)
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 59
  • No :9
  • Pages :1033-1047
  • Received Date : 2026-05-12
  • Revised Date : 2026-06-19
  • Accepted Date : 2026-06-29
  • DOI :https://doi.org/10.3741/JKWRA.2026.59.9.1033
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