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Standardized Precipitation Evapotranspiration Index (SPEI)

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The SPEI dataset was developed by first aligning and formatting the precipitation and potential evaporation dataset using Climate Data Operators (CDO). Then a water deficit dataset was produced by subtracting these two datasets. Later, using R programming languages SPEI package, created by Santiago Beguería and Sergio M. Vicente-Serrano, the SPEI values were estimated for forty-eight different timescales. Finally, the dataset was validated using Climate Research Unit’s dataset, soil moisture dataset and Normalized Difference Vegetation Index dataset.

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