ABSTRACT
ABSTRACT: Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST) are both important index of drought monitoring. MODIS data is used in this paper, and Temperature Vegetation Dryness Index (TVDI) is obtained by establishing NDVI-Ts character space which inverts surface temperature by using NDVI and split window method, and it does well in spatial distribution of land surface drought degree, so as to realize the drought monitoring. It is dynamic monitored that the time and space characteristics of drought from different periods in a year in Dongting lake Hunan Province. The results show that the scope of the drought occurred is coinciding with the occurrence of the drought by TVDI; the main area of heavy drought in the distribution is basically consistent. We also used the related research results to test and verify drought monitor results, and it turned out to be credible and was able to provide a powerful support to decision-making departments.
