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What is EDI (EffectiveDrought Index)?

The EDI is calculated in daily time step and its values are standardized in a similar way with that for calculating SPI values. The EDI was originally developed by Byun and Wilhite (1999) to overcome some limitations of other indices. The value of EDI generally ranges from -2.5 to 2.5. Near normal conditions are indicated when EDI ranges from -1.0 to 1.0, while extreme drought conditions are indicated when EDI is less than or equal to -2.0. Effective precipitation should be calculated firstly before obtaining the EDI. AgMerra Drought

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