Calculating the monthly conventional and self-calibrating Palmer Drought Severity Index (PDSI and scPDSI) using the precipitation and potential evapotranspiration data. The function to calculate PDSI is based on the C++ source codes developed by Nathan Wells, Steve Goddard and Michael J. Hayes, University of Nebraska¡ªLincoln. Reference: Palmer W. Meteorological drought[J]. U.s.department of Commerce Weather Bureau Research Paper, 1965. Wells N, Goddard S, Hayes M J. A Self-Calibrating Palmer Drought Severity Index[J]. Journal of Climate, 2010, 17(12):2335-2351.
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