This glossary provides definitions of important terms used in the descriptions of ISciences' capabilities and products.

Composite water anomaly index combines multiple parameters to best capture water surpluses and deficits. Deficits are based on the most extreme of three water deficit indicators: soil moisture deficit, evapotranspiration deficit, and total blue water deficits.  Surpluses are based on the most extreme of two water surplus indicators: runoff surpluses and total blue water surpluses. Maps of the composite water anomaly index show deficits in warm colors and surpluses in cool colors. Because surpluses and deficits are estimated using different parameters, it is possible for a single half-degree cell to indicate both surpluses and deficits. These cases are shown in shades of purple, with the return period based on the more extreme of the surplus or deficit indicators.

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