![]() ![]() However, table grape yield with SVI had the highest variation in July ( r 2 = 0.60). Moreover, the validation results indicated that the highest variability of table grape yield with SPI ( r 2 = 0.62) was observed in June. The results indicated that the years 2013, 2014, 2015, 2016, 20 were characterized by drought across the region within the berry formation and veraison growth phases of table grape before harvest. Validation was performed between drought indices and grape yield at the regional level using regression analysis. Drought severity maps were classified based on thresholds from extremely dry to extremely wet. ![]() The time-series standard vegetation index (SVI) was developed from the time-series normalized difference vegetation index (NDVI) for 2013–2021, and the time-series SPI was calculated from time-series CHIRPS rainfall using the Google Earth engine (GEE). Therefore, the main aim of this research was to identify drought-affected vineyards on a regional scale by satellite remote sensing images with a standardized precipitation index (SPI) and standard vegetation index (SVI). Grapes are sensitive to water stress during the summer, when high evapotranspiration is combined with very low precipitation. These issues mostly happen due to water shortages and elevated temperatures. ![]() Drought is a complicated and slow-moving natural disaster that has severe impacts on plant greenness and yields by interrupting plant photosynthetic activity. ![]()
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