#' Function to get boundary of a spatial object.
#'
#' \code{sp_boundary} often requires a single object to determine a boundary.
#' Use \code{\link{sp_unite}} to create a single geometry from many.
#'
#' @param sp Spatial object.
#'
#' @param features Create boundaries for features within \code{sp}. Default is
#' \code{FALSE}.
#'
#' @author Stuart K. Grange
#'
#' @export
sp_boundary <- function(sp, features = FALSE) {
#
# if (length(sp) != 1) sp <- sp_unite(sp)
#
sp <- rgeos::gBoundary(sp, byid = features)
# Return
sp
}
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