R/spatialwarnings.R

In spatialwarnings: Spatial Early Warning Signals of Ecosystem Degradation

# 
# 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 suggestion of several indicators 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 familar 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 
#'  in a different workflow. 
#'  
#'  Main functions provided by this package 
#'  
#'  "Workflow" functions:
#'  \itemize{ 
#'    \item \code{\link{generic_spews}}: Generic spatial EWS
#'    \item \code{\link{spectral_spews}}: Spectrum-based EWS
#'    \item \code{\link{patchdistr_spews}}: EWS based on patch-size distributions
#'  }
#'  
#'  Individual indicators: 
#'  \itemize{ 
#'    \item \code{\link{indicator_moran}}: lag-1 spatial autocorrelation (Moran's I)
#'    \item \code{\link{indicator_variance}}: Spatial variance
#'    \item \code{\link{indicator_skewness}}: Spatial skewness
#'    \item \code{\link{indicator_sdr}}: Spectral density ratio (SDR)
#'    \item \code{\link{indicator_psdtype}}: Patch-size distribution shape 
#'    \item \code{\link{indicator_plrange}}: Power-law range
#'  }
#' 
#' @docType package
#' @name spatialwarnings
#' 
#' @aliases spatialwarnings-package
#' 
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