| Normalized Different Vegetation Index(NDVI) and Land Surface Temperature(Ts) were extracted from MODIS data,and were used to construct the NDVI-Ts space,from which the Temperature Vegetation Drought Index(TVDI) was obtained as drought index.The drought dynamic variation for the farming region of east shallow mountain in Qinghai in the first ten-day in July, 2004 was monitored,and compared with the simultaneously measured data of each observatory.The results indicated that it was feasible to monitor the drought dynamic variation in Qinghai high and cold area by using TVDI. |