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#
# This is the main page for the package documentation.
#
#' @rdname spatialwarnings
#'
#' @title Early Spatial-Warnings of Ecosystem Degradation
#'
#' @description
#'
#' Many dynamical systems such as ecosystems exhibit non-linear responses to
#' changes in their external drivers, resulting in possible wide state shifts
#' with strong ecological or economical consequences. This often happens when
#' a system exhibit a change in its stability properties as a threshold is
#' crossed, \emph{e.g.} going from multiple stable states to a single stable
#' state. For a few decades, much research has been dedicated to finding a
#' way to anticipate these tipping points in ecological systems. This has led
#' to the development of several indicators, i.e. metrics based on spatial
#' structure, that could reflect the proximity of an ecosystem to a tipping
#' point.
#'
#' This package implements the computation of these indicators, or
#' \emph{early-warning signals} (EWS), on spatial raster data. High-level
#' functions and methods provide familiar workflows to compute the indicators
#' and display their variations along environmental gradients or time-series.
#' Lower-level functions are also available to integrate early-warning signals
#' into different workflows.
#'
#' Main functions provided by this package:
#'
#' "Workflow" functions, which may compute several indicators at once:
#' \itemize{
#' \item \code{\link{generic_sews}}: Generic spatial EWS
#' \item \code{\link{spectral_sews}}: Spectrum-based EWS
#' \item \code{\link{patchdistr_sews}}: EWS based on patch-size distributions
#' \item \code{\link{kbdm_sews}}: Kolmogorov complexity
#' \item \code{\link{flowlength_sews}}: Flow length
#' \item \code{\link{variogram_sews}}: Variogram-based indicators
#' }
#'
#' Individual indicators, which may be used to compute raw indicator values
#' on a single matrix:
#'
#' \itemize{
#' \item \code{\link{raw_cg_moran}}: lag-1 spatial autocorrelation
#' \item \code{\link{raw_cg_variance}}: Spatial variance
#' \item \code{\link{raw_cg_skewness}}: Spatial skewness
#' \item \code{\link{raw_sdr}}: Spectral density ratio (SDR)
#' \item \code{\link{indicator_psdtype}}: Patch-size distribution shape
#' \item \code{\link{indicator_plrange}},
#' \code{\link{raw_plrange}} : Power-law range
#' \item \code{\link{raw_kbdm}}: Kolmogorov complexity
#' \item \code{\link{raw_flowlength_uniform}}: Flow Length
#' \item \code{\link{raw_variogram_metrics}}: Variogram-based metrics
#' }
#'
#' The package homepage is available at
#' \href{https://github.com/spatial-ews/spatialwarnings}{Github}
#' and a
#' \href{https://alex.lecairn.org/spatialwarnings-faq.html}{user guide} is
#' also available.
#'
#' @docType package
#' @name spatialwarnings
#'
#' @aliases spatialwarnings-package
#'
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