Monitoring of drought situation in Shaanxi Province based on MODIS land product LST,NDVI and EVI

This paper chooses Shaanxi Province as a study area.Using normalized difference vegetation index (NDVI),enhanced vegetation index(EVI) and land surface temperature(LST) gained from MODIS synthetic products data MODIS11C3 and MODIS13C3 in April 2005,the TS-NDVI and TS-EVI characteristic space were established and the conditional temperature vegetation dryness index(TVDI) and the spatial distribution map of drought situation grade were obtained.In order to monitor and evaluate the drought in Shaanxi Province,a comparative analysis of results was necessary at the same time.Finally,based on combining air temperature and precipitation anomaly data from 94 meteorological stations the correlation was analyzed.The results show that.the linear correlation between drought situation-monitoring model,which is set up on surfdce temperature and enhanced vegetation indes,and precipitation anomaly is significant.The correlation coefficient is 0.537 and gets through 0.05 level test.