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#' Read DWD REGNIE gridded data into R
#'
#' @description This functions reads DWD REGNIE data.
#' A description of the data can be found here (pdf-format):
#' \url{https://www.dwd.de/DE/leistungen/regnie/download/regnie_beschreibung_pdf.pdf?__blob=publicationFile&v=2}.
#' Data is available here: \url{ftp://ftp-cdc.dwd.de/pub/CDC/grids_germany/daily/regnie/}.
#' @import raster readr
#' @param file path to gz archive
#' @return A \code{RasterLayer} object.
#' @export
#' @examples
#' # Read daily precipitation on 20.01.2005.
#' r <- read_regnie(system.file("extdata", "ra050120.gz", package = "esmisc"))
read_regnie <- function(file){
cont <- read_fwf(file,
col_positions = fwf_widths(rep(4, 611)),
col_types = cols(.default = col_integer()),
n_max = 971,
na = '-999')
r <- raster(as.matrix(cont))
extent(r) <- c(5.833333, 16, 47, 55.083333)
crs(r) <- "+proj=longlat"
# scale to mm
r <- r/10
return(r)
}
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