edidigiu/DROUGHT-SPEI: SPEI-Trend

This code can be used for the computation of Standardized Precipitation Evapotranspiration Index (SPEI) time series at a global scale as well as for the trend analysis. The latter includes either the common non-parametric Mann-Kendall test or a trend test for the different classes of drought risk based on the Poisson process. This code has been used to obtain the results described in: Di Giuseppe E., Pasqui M., Magno R., Quaresima S., 2019: A Counting Process Approach for Trend Assessment of Drought Condition, Hydrology, 6(4), 84, doi:10.3390/hydrology6040084