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#' Generation of virtual species
#'
#' This package allows generating virtual species distributions, for example
#' for testing species distribution modelling protocols.
#' For a complete tutorial,
#' see borisleroy.com/virtualspecies
#'
#'
#' @details
#' The process of generating a virtual species distribution is divided into
#' four major steps.
#' \enumerate{
#' \item{Generate a virtual species distributions from environmental variables.
#' This can be done by
#' \itemize{
#' \item{defining partial response functions to each environmental
#' variable, and then combining them to compute the overall environmental
#' suitability,
#' with \code{\link{generateSpFromFun}}}
#' \item{computing a PCA among
#' environmental variables, and simulating the response of the species along
#' the two first axes of the PCA with \code{\link{generateSpFromPCA}}}}
#' This step can be randomised with \code{\link{generateRandomSp}}
#' }
#' \item{Convert the virtual species distribution into presence-absence, with
#' \code{\link{convertToPA}}}
#' \item{Facultatively, introduce a distribution bias with
#' \code{\link{limitDistribution}}}
#' \item{Sample occurrence points (presence only or presence-absence) inside the
#' virtual species distribution, either randomly or with biases, with
#' \code{\link{sampleOccurrences}}}
#' }
#'
#' There are other useful functions in the package:
#' \itemize{
#' \item{\code{\link{formatFunctions}}: this is a helper function to format and
#' illustrate the response functions as a correct input for
#' \code{\link{generateSpFromFun}}}
#' \item{\code{\link{plotResponse}}: to visualise the species-environment
#' relationship
#' of the virtual species}
#' \item{\code{\link{removeCollinearity}}: this function can be used to remove
#' collinearity among variables of a stack by selecting a subset of
#' non-colinear variables}
#' \item{\code{\link{synchroniseNA}}: this function can be used to synchronise
#' NA values among layers of a stack}
#' }
#'
#'
#'
#'
#' This packages makes use of different other packages:
#' \itemize{
#' \item{This package makes extensive use of the package \code{\link{terra}}
#' to obtain spatialised
#' environmental variables, and produce spatialised virtual
#' species distributions.}
#' \item{\code{\link{ade4}} is used to generate species with a PCA approach.}
#' \item{\code{\link{rnaturalearth}} is used to obtain free world shapefiles,
#' in order to create
#' dispersal limitations and sampling biases.}
#' }
#' @references
#' Leroy, B. et al. 2016. virtualspecies, an R package to generate virtual
#' species distributions. Ecography. 39(6):599-607
#' @author
#' Boris Leroy \email{leroy.boris@@gmail.com}
#'
#' with help from C. N. Meynard, C. Bellard & F. Courchamp
#'
#' Maintainer: Boris Leroy \email{leroy.boris@@gmail.com}
#' @name virtualspecies-package
#' @docType package
#' @import raster
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