Investigation of Vegetation Drought in Qazvin Province over Time

Drought assessment is the first step in natural resources management in order to prevent and reduce the negative effects of future events. The purpose of this study is to investigate the spatial and temporal patterns of drought in Qazvin province. For this purpose, Vegetation Health Index (VHI) was used based on Enhanced Vegetation Index (EVI) and Land Surface Temperature (LST) obtained from MOD۱۳A۲ product of MODIS images in ۲۰۰۱, ۲۰۱۰ and ۲۰۱۹. Results showed that vegetation cover had more severe drought in ۲۰۰۱ compared to ۲۰۱۰ and ۲۰۱۹, so that pixels containing drought were observed throughout the province. In ۲۰۱۰ (a decade later), only the northeastern and southwestern parts of the province had good condition in term of vegetation drought. While in ۲۰۱۹, the condition of vegetation was normal to medium. The results of this study provide a prognosis about the drought of Qazvin province. Prepared maps of drought and their information are also useful for preparing and prioritizing drought risk

کلیدواژه ها:

Remote sensing ، Vegetation drought ، Qazvin province ، MODIS.