Drought monitoring chnages in Droudzan catchment using MODIS images

One of the methods of studying drought and its destructive effects is drought monitoring and zoning using meteorological indicators and remote sensing techniques. In order to determine the effect of droughts on vegetation changes, drought intensities were determined using annual SPI drought indices by rainfall data of meteorological stations. In this research, SPI drought index was investigated in short and one-month periods and the annual period for three stations which according to the results of the calculation of meteorological drought indicators in general in all stations in The 2001, 2003, 2005, 2007, and 2013 droughts have occurred from weak to severe, and also occurred in 2009 and 2014 in the region of Tarsal. Initially, the standard rainfall index (SPI) was calculated for three meteorological stations in Shiraz, Eghlid and Dorogozan during the years 2015 to 2001, and then, based on images taken from MODIS in October, August, September, the normalized vegetation difference index ( NDVI) and then the correlation between meteorological indices and vegetation was taken during the statistical period for dry and wet years. Accurately, the NDVI's statistical results have the highest correlation with drought and climatic variation with the Drooden Station, .