#' Calculates the correlation coefficient between two rasters.
#'
#' @param x Either a raster or an ENMTools model object with a suitability raster.
#' @param y Either a raster or an ENMTools model object with a suitability raster.
#' @param method The method to be used for calculating correlations. Defaults to spearman, but can take "kendall" or "pearson" as well.
#'
#' @return A numeric correlation coefficient.
#'
#' @examples
#' data(euro.worldclim)
#' raster.cor(euro.worldclim[[1]], euro.worldclim[[2]])
raster.cor <- function(x, y, method="spearman"){
if(inherits(x, "enmtools.model")){
x <- x$suitability
}
if(inherits(y, "enmtools.model")){
y <- y$suitability
}
df <- cbind(terra::values(x), terra::values(y))
df <- df[complete.cases(df),]
return(cor(df[,1], df[,2], method=method))
}
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