Agricultural And Meteorological Softwares Agricultural And Meterological Softwares

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What is the input data and details of calculations for RAI (Rainfall Anomaly Index)

This index is a rain-base drought index. It is a meteorological drought index. When you want to use it, you can use daily or monthly precipitation data. The RAI considers two anomalies, i.e., positive anomaly and negative anomaly. First, the precipitation data are arranged in descending order. The ten highest values are averaged to form a threshold for positive anomaly and the ten lowest values are averaged to form a threshold for negative anomaly. For the details of equations refer to AgMerra Drought paper

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