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#' Download spatial data of municipal seats (sede dos municipios) in Brazil
#'
#' @description
#' This function reads the official data on the municipal seats (sede dos municipios)
#' of Brazil. The data brings the geographical coordinates (lat lon) of municipal
#' seats for various years between 1872 and 2010. Original data were generated by
#' Brazilian Institute of Geography and Statistics (IBGE).
#'
#' @param year Numeric. Year of the data in YYYY format. Defaults to `2010`.
#' @template showProgress
#'
#' @return An `"sf" "data.frame"` object
#'
#' @export
#' @family area functions
#'
#' @examplesIf identical(tolower(Sys.getenv("NOT_CRAN")), "true")
#' # Read municipal seats in an specific year
#' m <- read_municipal_seat(year = 1991)
#'
read_municipal_seat <- function(year=2010, showProgress=TRUE){
# Get metadata with data url addresses
temp_meta <- select_metadata(geography="municipal_seat", year=year, simplified=F)
# 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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