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#' Download spatial data of official metropolitan areas in Brazil
#'
#' @description
#' The function returns the shapes of municipalities grouped by their respective
#' metro areas. Metropolitan areas are created by each state in Brazil. The data
#' set includes the municipalities that belong to all metropolitan areas in the
#' country according to state legislation in each year. Original data were
#' generated by Institute of Geography. Data at scale 1:250,000, using Geodetic
#' reference system "SIRGAS2000" and CRS(4674).
#'
#' @param year Numeric. Year of the data in YYYY format. Defaults to `2018`.
#' @template simplified
#' @template showProgress
#'
#' @return An `"sf" "data.frame"` object
#'
#' @export
#' @family area functions
#'
#' @examplesIf identical(tolower(Sys.getenv("NOT_CRAN")), "true")
#' # Read all official metropolitan areas for a given year
#' m <- read_metro_area(2005)
#'
#' m <- read_metro_area(2018)
#'
read_metro_area <- function(year=2018, simplified=TRUE, showProgress=TRUE){
# Get metadata with data url addresses
temp_meta <- select_metadata(geography="metropolitan_area", year=year, simplified=simplified)
# list paths of files to download
file_url <- as.character(temp_meta$download_path)
# download files
temp_sf <- download_gpkg(file_url, progress_bar = showProgress)
# check if download failed
if (is.null(temp_sf)) { return(invisible(NULL)) }
return(temp_sf)
}
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