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#' Download spatial data of Brazilian environmental conservation units
#'
#' @description
#' This data set covers the whole of Brazil and it includes the polygons of all
#' conservation units present in Brazilian territory. The last update of the data
#' was 09-2019. The original data comes from MMA and can be found at "http://mapas.mma.gov.br/i3geo/datadownload.htm".
#'
#' @param date Numeric. Date of the data in YYYYMM format. Defaults to `201909`.
#' @template simplified
#' @template showProgress
#'
#' @return An `"sf" "data.frame"` object
#'
#' @export
#' @family general area functions
#'
#' @examplesIf identical(tolower(Sys.getenv("NOT_CRAN")), "true")
#' # Read conservation_units
#' b <- read_conservation_units(date = 201909)
#'
read_conservation_units <- function(date=201909, simplified=TRUE, showProgress=TRUE){
# Get metadata with data url addresses
temp_meta <- select_metadata(geography="conservation_units", year=date, 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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