Analysis and monitoring of drought temporally and spatially using MODIS sensor products (Case study of Isfahan province)

Drought is a natural hazard that has a significant impact on the economic, agricultural, environmental and social aspects. Therefore, monitoring and studying this phenomenon is important and vital. Much research has been done in this regard and based on indicators extracted from satellite data. In the present study, drought monitoring was performed based on the VHI index extracted from satellite data. This index is a combination of two indicators of vegetation status (VCI) and temperature index (TCI), which is used to calculate these two indicators of MOD13 and MOD11 products of MODIS sensor, which are related to normalized differential vegetation index (NDVI) and surface temperature, respectively. Land (LST), used in the period from 2010 to 2018. Evaluation of telemetry index (VHI) was done using standardized precipitation index (SPI), so that the correlation coefficient of annual values of SPI index, 14 synoptic stations of the study area with VHI index values in the same stations in the period 2010-2017 شد .The results showed a correlation coefficient between 0.64 and 0.81 in the years under review.