lmomPi-Package {lmomPi}

lmomPi: (Precipitation) Frequency Analysis and Variability with L-Moments from lmom

Description

This packages contains wrapper functions of 'lmom' packages : cdf: generic distribution function; qua: generic quantile function; pel: fitting of probability distribution function through L-moments.

Details

The example functions are illustrated making use of CHIRPS rainfall meteorological data taken:

Funk, Chris, Pete Peterson, Martin Landsfeld, Diego Pedreros, James Verdin, Shraddhanand Shukla, Gregory Husak, James Rowland, Laura Harrison, Andrew Hoell and Joel Michaelsen. "The climate hazards infrared precipitation with stations - a new environmental record for monitoring extremes". Scientific Data 2, 150066. doi:10.1038/sdata.2015.66 2015 , https://chc.ucsb.edu/data/chirps.

The package-provided datasets shall be only used as example datasets.

The package also contains wrapped functions to calculate several indices based on variability (e.g. 'SPI' , Standardized Precipitation Index, see https://climatedataguide.ucar.edu/climate-data/standardized-precipitation-index-spi and http://spei.csic.es) for multiple time series or spatio-temporal gridded values. The function spi.cdf() is compared against SPEI::spi() in SPEI package (https://cran.r-project.org/package=SPEI). The differences in SPI extimation have order of magnitude averagely about 10^-8, due to the different fitting methods implemented in the two packages. (see SPEI::spi() and spi.cdf() for more details).

The development of this package has been sponsored by ACEWATER2 and "Water for Growth and Poverty Reduction in the Mekrou" projects of the Joint Research Centre of the Europan Commission (https://aquaknow.jrc.ec.europa.eu).