Abstract
8-day composite MODIS temperature product MOD11A2 and 16-day composite MODIS NDVI product MOD13A2 were combined to construct Ts/NDVI space and the TVDI(Temperature Vegetation Dryness Index) was obtained.Every 16-day soil moisture in 40cm depth in different seasons in Yizheng was retrieved by TVDI.When compared with the soil moisture in 40cm depth measured simultaneously with satellite in the field,the mean error was 11.83% and minimum error reached 4.30%.The soil moisture distribution map shows that there were two high-value soil moisture areas,located in the Yangtze River alluvial plains in the southern part of Yizheng and the corner plains in the northwest part of Yizheng.The greater of the mean soil moisture is,the smaller of the difference between its high value and low value in the region.
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