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#' Getting coordinates from a string provided by the Ogimet web portal
#'
#' Internal function for cleaning coordinates' metadata provided by Ogimet
#' @param txt string with coordinates from Ogimet
#' @param pattern which element (Longitude or Latitude) to extract
#'
#' @format The returned object is the geographic coordinates using WGS84 (EPSG:4326) in decimal format.
#' Negative values mean western or southern Hemisphere
#' @keywords internal
#'
#' @examples
#' \donttest{
#' txt = "12120: Leba (Poland)\nLatitude: 54-45N Longitude: 017-32E Altitude: 2 m."
#' climate:::get_coord_from_string(txt, pattern = "Latitude")
#' }
#'
get_coord_from_string = function(txt, pattern = "Longitude") {
tt = gregexpr(pattern, txt)
start = tt[[1]][1] + attributes(tt[[1]])$match.length + 1
tmp = trimws(substr(txt, start = start, stop = start + 8))
tmp = strsplit(tmp, "-")[[1]]
hemisphere = gsub("[0-9]", "", strsplit(tmp, "-")[2])
hemisphere = gsub(".*?(\\b[A-Za-z0-9 ]+\\b).*", "\\1", hemisphere)
tmp = suppressWarnings(as.numeric(gsub("([0-9]+).*$", "\\1", strsplit(tmp, "-"))))
wsp = suppressWarnings(as.numeric(tmp)[1] + (as.numeric(tmp)[2] * 5 / 3) / 100)
if (hemisphere %in% c("W", "S")) {
wsp = wsp * -1
}
return(wsp)
}
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