| Summary: | 碩士 === 國立中央大學 === 遙測科技碩士學位學程 === 100 === Drought and desertification are closely related with social and economic factors. Various characteristics of meteorological drought cause impacts on agricultural yields, such as precipitation shortages, differences
between actual and potential evapotranspiration, soil water deficits, and other physiologic factors of the soil and plants. In this paper, remote sensing is utilized to monitor drought condition over Mongolia. In this study, the Temperature Vegetation Dryness Index (TVDI) which is derived from MODIS/Terra data was applied to monitor the
drought over Mongolia in the summer season from 2002 to 2009. Based on the EVI-Ts feature space, which was constructed by Land Surface Temperature (Ts) and Enhanced Vegetation Index (EVI) extracted from the MODIS satellite data, the TVDI was calculated to characterize the drought condition. According to the classification standard of TVDI used in the literature, the drought condition was divided into five grades: humid (0-0.2), sub-humid (0.2-0.4), normal (0.4-0.6), moderate drought (0.6-0.8), and severe drought (0.8-1.0). The meteorological data and soil moisture data were collected to compare with TVDI.
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