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#' @name Datasets
#' @aliases wichita balance cabinda cruts4
#' @title Data sets for illustrating the functions in the SPEI package.
#' @keywords datasets
#' @description
#' Data used in the examples of the SPEI package:
#' \code{wichita} dataset: monthly climate in Wichita (Kansas, lat=37.6475,
#' elevation=402.6 m. a.s.l.) since January 1980;
#' \code{balance} dataset: monthly climatic water balance (precipitation
#' minus potential evapotranspiration) at eleven locations around the World,
#' since January 1900;
#' \code{cabinda}: one year of data for computing Penman-Monteith ET0 from
#' Allen et al. (1998);
#' \code{cruts4}: 120 years of monthly climatic water balance (precipitation
#' minus reference evapotranspiration) data at six grid points from
#' CRU TS 4.05.
#' @details See description.
#' @format
#' \code{wichita} dataset: a data frame with:
#' \describe{
#' \item{YEAR}{ monthly precipitation totals, in mm.}
#' \item{MONTH}{ monthly precipitation totals, in mm.}
#' \item{PRCP}{ monthly precipitation totals, in mm.}
#' \item{TMAX}{ monthly mean daily maximum temperature, in ºC.}
#' \item{TMIN}{ monthly mean daily minimum temperature, in ºC.}
#' \item{TMED}{ monthly mean temperature, in ºC.}
#' \item{AWND}{ monthly mean wind speed, in km h-1}
#' \item{ACSH}{ monthly mean sun hours, in h.}
#' \item{ACSH}{ monthly mean cloud cover, in \%.}
#' }
#' \code{balance} dataset: a data frame with monthly climatic water balance
#' (precipitation minus potential evapotranspiration) at Indore (India),
#' Kimberley (South Africa), Albuquerque (US), Valencia (Spain),
#' Wien (Austria), Abashiri (Japan), Tampa (US), Sao Paulo (Brazil),
#' Lahore (India), Punta Arenas (Chile) and Helsinki (Finland), in mm.
#' \code{cabinda} dataset: a data frame with one year of monthly climatic data
#' at Cabinda (Angola, -5.33S 12.11E 20 m), with:
#'
#' \describe{
#' \item{mon}{ month of the year}
#' \item{Tmin}{ monthly mean daily minimum temperature, in ºC.}
#' \item{Tmax}{ monthly mean daily maximum temperature, in ºC.}
#' \item{RH}{ monthly mean relative humidity, in \%.}
#' \item{U2}{ monthly mean wind speed, in km h-1}
#' \item{tsun}{ monthly mean sunshine hours, in h.}
#' \item{Rs}{ monthly mean daily incoming solar radiation, MJ m-2 d-1.}
#' \item{ET0}{ monthly ET0 from the original publication, in mm.}
#' }
#'
#' \code{cruts4} dataset: an array with 120 years of monthly climatic water
#' balance (precipitation minus reference evapotranspiration) data at six grid
#' points from CRU TS 4.05 data set. The array has dimensions [time=1440,
#' longitude=2, latitude=3], with time starting in January 1900. Longitudes
#' are (0.25, 0.75), and latitudes (42.25, 42.75, 43.25), corresponding to the
#' Central Pyrenees between Spain and France.
#'
#'
#' @references
#' S.M. Vicente-Serrano, S. Beguería, J.I. López-Moreno. 2010. A Multi-scalar
#' drought index sensitive to global warming: The Standardized Precipitation
#' Evapotranspiration Index – SPEI. \emph{Journal of Climate} \bold{23}: 1696,
#' DOI: 10.1175/2009JCLI2909.1.
#'
#' R.G. Allen, L.S. Pereira, D. Raes, M. Smith. 1998. \emph{JCrop
#' evapotranspiration - Guidelines for computing crop water requirements - FAO
#' Irrigation and drainage paper 56}. FAO, Rome. ISBN 92-5-104219-5.
#'
#'
#' @source
#' The \code{wichita} data were obtained from the Global Historical Climatology
#' Network (GHCN, \url{http://www.ncei.noaa.gov/}. Data for the \code{balance}
#' dataset were extracted from CRU TS V3.1 and from the 20th Century Reanalysis
#' V2 data set.
#' Data for the \code{balance} dataset were taken from Allen et al. (1998),
#' page 69, figure 18.
#' The \code{cruts4} data were obtained from the CRU (Climatic Research Unit,
#' University of East Anglia \url{https://crudata.uea.ac.uk/}) TS V4.05
#' data set.
#'
#' @author Data ported to R by S. Beguería.
#'
#'
#' @examples
#' data(wichita)
#' names(wichita)
#' summary(wichita)
#' data(balance)
#' summary(balance)
#' data(cruts4)
#' summary(cruts4)
#'
NULL
#' @rdname wichita
"wichita"
#' @rdname cabinda
"cabinda"
#' @rdname balance
"balance"
#' @rdname cruts4
"cruts4"
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