R/vis_bioclimPlot.R

In wallace: A Modular Platform for Reproducible Modeling of Species Niches and Distributions

#' @title vis_bioclimPlot Visualize bivariate plot of BIOCLIM model
#' @description
#' This functions creates a bivariate plot with two of the environmental
#'   variables used for modeling as x and y axes and occurrences as observations.
#'
#' @details
#' This is a bivariate plot with x and y axes representing two of the
#'   environmental layers used for modeling (user selected although 1 and 2 as
#'   default). Occurrences used for modeling are shown with differential
#'   visualization if they are outside of the selected percentile distribution
#'   (for any variable). Plot also includes a rectangle representing the
#'   bivariate bioclimatic envelope according to a provided percentile.
#'
#' @param x bioclim model including values for each environmental layer at
#'   each occurrence point
#' @param a numeric Environmental layer to be used as x axis. Default is
#'   layer 1.
#' @param b numeric. Environmental layer to be used as x axis. Default is
#'   layer 2.
#' @param p numeric. (0-1) percentile distribution to be used for plotting
#'   envelope and showing points outside of envelope. Default is 0.9
#' @examples
#' \dontrun{
#' envs <- envs_userEnvs(rasPath = list.files(system.file("extdata/wc",
#'                                            package = "wallace"),
#'                       pattern = ".tif$", full.names = TRUE),
#'                       rasName = list.files(system.file("extdata/wc",
#'                                            package = "wallace"),
#'                       pattern = ".tif$", full.names = FALSE))
#' occs <- read.csv(system.file("extdata/Bassaricyon_alleni.csv",
#'                  package = "wallace"))
#' bg <- read.csv(system.file("extdata/Bassaricyon_alleni_bgPoints.csv",
#'                package = "wallace"))
#' partblock <- part_partitionOccs(occs, bg, method = 'block')
#' m <- model_bioclim(occs, bg, partblock, envs)
#' bioclimPlot <- vis_bioclimPlot(x = m@@models$bioclim,
#'                                a = 1, b = 2, p = 1)
#' }
#'
#' @return A bivariate plot of environmental values for occurrences. Includes a
#'   blue rectangle representing the bioclimatic envelope given p. Occurrences
#'   that are inside the envelope for all layers (included those not plotted)
#'   are shown as green circles and those outside of the envelope for one ore
#'   more variables are plotted as orange triangles.
#' @author Jamie Kass <jkass@@gradcenter.cuny.edu>
#' @author Gonzalo E. Pinilla-Buitrago <gepinillab@@gmail.com>
# @note
#' @seealso
#'\code{\link{model_bioclim}} \code{\link[ENMeval]{ENMevaluate}}
#' @export

vis_bioclimPlot <- function(x, a = 1, b = 2, p = 0.9) {

  d <- x@presence

  myquantile <- function(x, p) {
    p <- min(1, max(0, p))
    x <- sort(as.vector(stats::na.omit(x)))
    if (p == 0) return(x[1])
    if (p == 1) return(x[length(x)])
    i = (length(x)-1) * p + 1
    ti <- trunc(i)
    below = x[ti]
    above = x[ti+1]
    below + (above-below)*(i-ti)
  }

  p <- min(1,  max(0, p))
  if (p > 0.5) p <- 1 - p
  p <- p / 2
  prd <- dismo::predict(x, d, useC = FALSE)
  i <- prd > p & prd < (1-p)
  plot(d[,a], d[,b], xlab=colnames(d)[a], ylab=colnames(d)[b], cex=0)
  type=6
  x1 <- stats::quantile(d[,a], probs=p, type=type)
  x2 <- stats::quantile(d[,a], probs=1-p, type=type)
  y1 <- stats::quantile(d[,b], probs=p, type=type)
  y2 <- stats::quantile(d[,b], probs=1-p, type=type)
  graphics::polygon(rbind(c(x1,y1), c(x1,y2), c(x2,y2), c(x2,y1), c(x1,y1)),
                    border = '#0072B2', lwd = 2)
  graphics::points(d[i,a], d[i,b], xlab = colnames(x)[a], ylab = colnames(x)[b],
                   col = '#009E73', pch = 16)
  graphics::points(d[!i,a], d[!i,b], col = "#D55E00", pch = 17)
}