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Terra MODIS NDVI 및 LST 자료와 RNN-LSTM을 활용한 토양수분 산정
RNN-LSTM Based Soil Moisture Estimation Using Terra MODIS NDVI and LST
장원진 ( Jang Wonjin ) , 이용관 ( Lee Yonggwan ) , 이지완 ( Lee Jiwan ) , 김성준 ( Kim Seongjoon )
DOI 10.5389/KSAE.2019.61.6.123
UCI I410-ECN-0102-2021-500-000125487

This study is to estimate the spatial soil moisture using Terra MODIS (Moderate Resolution Imaging Spectroradiometer) satellite data and machine learning technique. Using the 3 years (2015∼2017) data of MODIS 16 days composite NDVI (Normalized Difference Vegetation Index) and daily Land Surface Temperature (LST), ground measured precipitation and sunshine hour of KMA (Korea Meteorological Administration), the RDA (Rural Development Administration) 10 cm∼30 cm average TDR (Time Domain Reflectometry) measured soil moisture at 78 locations was tested. For daily analysis, the missing values of MODIS LST by clouds were interpolated by conditional merging method using KMA surface temperature observation data, and the 16 days NDVI was linearly interpolated to 1 day interval. By applying the RNN-LSTM (Recurrent Neural Network-Long Short Term Memory) artificial neural network model, 70% of the total period was trained and the rest 30% period was verified. The results showed that the coefficient of determination (R2), Root Mean Square Error (RMSE), and Nash-Sutcliffe Efficiency were 0.78, 2.76%, and 0.75 respectively. In average, the clay soil moisture was estimated well comparing with the other soil types of silt, loam, and sand. This is because the clay has the intrinsic physical property for having narrow range of soil moisture variation between field capacity and wilting point.

Ⅰ. 서론
Ⅱ. 재료 및 방법
III. 결과 및 고찰
IV. 결론
감사의 글
REFERENCES
[자료제공 : 네이버학술정보]
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