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#' raster_to_points
#'
#' @description Raster to points
#'
#' @param landscape A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters.
#' @param return_NA If true, NA cells are also included
#'
#' @details
#' Wrapper around terra::xyFromCell and terra::getValues to get raster_to_points
#' function including NA values
#'
#' @return matrix
#'
#' @examples
#' landscape <- terra::rast(landscapemetrics::landscape)
#' raster_to_points(landscape)
#'
#' @keywords internal
#'
#' @export
raster_to_points <- function(landscape, return_NA = TRUE) {
landscape <- landscape_as_list(landscape)
result <- lapply(X = seq_along(landscape), function(x) {
xyz <- raster_to_points_internal(landscape[[x]], return_NA = return_NA)
xyz <- cbind(layer = x, xyz)
})
result <- do.call(rbind, result)
return(result)
}
raster_to_points_internal <- function(landscape, return_NA) {
# preallocate matrix
xyz <- matrix(data = NA,
nrow = terra::ncell(landscape), ncol = 3)
# get coordinates
xyz[, c(1, 2)] <- terra::xyFromCell(landscape, cell = 1:terra::ncell(landscape))
# add values including NA
xyz[, 3] <- terra::values(landscape, mat = FALSE)
if (!return_NA) {
xyz <- xyz[!is.na(xyz[, 3]), ]
}
colnames(xyz) <- c("x", "y", "z")
return(xyz)
}
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