R/meteo_hourly.R

In imgw: Polish Meteorological and Hydrological Data

#' Hourly meteorological data
#'
#' Downloading hourly (meteorological) data from the SYNOP / CLIMATE / PRECIP stations available in the danepubliczne.imgw.pl collection
#'
#' @param rank rank of the stations ("synop", "climate", or "precip")
#' @param year vector of years (e.g., 1966:2000)
#' @param status leave the columns with measurement and observation statuses (default status = FALSE - i.e. the status columns are deleted)
#' @param coords add coordinates of the station (logical value TRUE or FALSE)
#' @param station name or ID of meteorological station(s).
#' It accepts names (characters in CAPITAL LETTERS) or stations' IDs (numeric)
#' @param col_names three types of column names possible: "short" - default, values with shorten names, "full" - full English description, "polish" - original names in the dataset
#' @param ... other parameters that may be passed to the 'shortening' function that shortens column names
#' @importFrom RCurl getURL
#' @importFrom XML readHTMLTable
#' @importFrom utils download.file unzip read.csv
#' @export
#'
#' @examples \donttest{
#'   hourly <- meteo_hourly(rank = "climate", year = 1984)
#'   head(hourly)
#' }
#'

meteo_hourly <- function(rank, year, status = FALSE, coords = FALSE, station = NULL, col_names = "short", ...){

  stopifnot(rank == "synop" | rank == "climate") # dla terminowek tylko synopy i klimaty maja dane

  options(RCurlOptions = list(ssl.verifypeer = FALSE)) # required on windows for RCurl

  base_url <- "https://dane.imgw.pl/data/dane_pomiarowo_obserwacyjne/"

  interval <- "hourly" # to mozemy ustawic na sztywno
  interval_pl <- "terminowe" # to mozemy ustawic na sztywno

  meta <- meteo_metadata(interval = "hourly", rank = rank)

  rank_pl <- switch(rank, synop = "synop", climate = "klimat", precip = "opad")

  a <- getURL(paste0(base_url, "dane_meteorologiczne/", interval_pl, "/", rank_pl, "/"),
              ftp.use.epsv = FALSE,
              dirlistonly = TRUE)
  ind <- grep(readHTMLTable(a)[[1]]$Name, pattern = "/")
  catalogs <- as.character(readHTMLTable(a)[[1]]$Name[ind])

  # fragment dla lat (ktore catalogs wymagaja pobrania:
  years_in_catalogs <- strsplit(gsub(x = catalogs, pattern = "/", replacement = ""), split = "_")
  years_in_catalogs <- lapply(years_in_catalogs, function(x) x[1]:x[length(x)])
  ind <- lapply(years_in_catalogs, function(x) sum(x %in% year) > 0)
  catalogs <- catalogs[unlist(ind)] # to sa nasze prawdziwe catalogs do przemielenia

  all_data <- NULL

  for (i in seq_along(catalogs)){
    catalog <- gsub(catalogs[i], pattern = "/", replacement = "")

    if(rank == "synop") {
      address <- paste0(base_url, "dane_meteorologiczne/terminowe/synop",
                        "/", catalog, "/")
      folder_contents <- getURL(address, ftp.use.epsv = FALSE, dirlistonly = FALSE) # zawartosc folderu dla wybranego roku

      ind <- grep(readHTMLTable(folder_contents)[[1]]$Name, pattern = "zip")
      files <- as.character(readHTMLTable(folder_contents)[[1]]$Name[ind])
      addresses_to_download <- paste0(address, files)
      # w tym miejscu trzeba przemyslec fragment kodu do dodania dla pojedynczej stacji jesli tak sobie zazyczy uzytkownik:
      # na podstawie zawartosci obiektu files

      for(j in seq_along(addresses_to_download)){
        temp <- tempfile()
        temp2 <- tempfile()
        download.file(addresses_to_download[j], temp)
        unzip(zipfile = temp, exdir = temp2)
        file1 <- paste(temp2, dir(temp2), sep = "/")
        data1 <- read.csv(file1, header = FALSE, stringsAsFactors = FALSE, fileEncoding = "CP1250")
        colnames(data1) <- meta[[1]]$parameters

        # usuwa statusy
        if(status == FALSE){
          data1[grep("^Status", colnames(data1))] <- NULL
        }

        unlink(c(temp, temp2))
        all_data[[length(all_data) + 1]] <- data1
      } # koniec petli po zipach do pobrania
    } # koniec if'a dla synopa

    ######################
    ###### KLIMAT: #######
    ######################
    if(rank == "climate") {
      address <- paste0(base_url, "dane_meteorologiczne/terminowe/klimat",
                        "/", catalog, "/")
      folder_contents <- getURL(address, ftp.use.epsv = FALSE, dirlistonly = FALSE) # zawartosc folderu dla wybranego roku

      ind <- grep(readHTMLTable(folder_contents)[[1]]$Name, pattern = "zip")
      files <- as.character(readHTMLTable(folder_contents)[[1]]$Name[ind])
      addresses_to_download <- paste0(address, files)
      # w tym miejscu trzeba przemyslec fragment kodu do dodania dla pojedynczej stacji jesli tak sobie zazyczy uzytkownik:
      # na podstawie zawartosci obiektu files

      for(j in seq_along(addresses_to_download)){
        temp <- tempfile()
        temp2 <- tempfile()
        download.file(addresses_to_download[j], temp)
        unzip(zipfile = temp, exdir = temp2)
        file1 <- paste(temp2, dir(temp2), sep = "/")
        data1 <- read.csv(file1, header = FALSE, stringsAsFactors = FALSE, fileEncoding = "CP1250")
        colnames(data1) <- meta[[1]]$parameters
        # usuwa statusy
        if(status == FALSE){
          data1[grep("^Status", colnames(data1))] <- NULL
        }

        unlink(c(temp, temp2))
        all_data[[length(all_data) + 1]] <- data1
      } # koniec petli po zipach do pobrania
    } # koniec if'a dla klimatu
  } # koniec petli po glownych catalogach danych dobowych

  all_data <- do.call(rbind, all_data)

  if (coords){
    all_data <- merge(imgw::meteo_stations, all_data, by.x = "id", by.y = "Kod stacji", all.y = TRUE)
  }

  # dodaje rank
  rank_code <- switch(rank, synop = "SYNOPTYCZNA", climate = "KLIMATYCZNA")
  all_data <- cbind(data.frame(rank_code = rank_code), all_data)

  all_data <- all_data[all_data$Rok %in% year, ] # przyciecie tylko do wybranych lat gdyby sie pobralo za duzo

  #station selection
  if (!is.null(station)) {
    if (is.character(station)) {
      all_data <- all_data[all_data$`Nazwa stacji` %in% station, ]
      if (nrow(all_data) == 0){
        stop("Selected station(s) is not available in the database.", call. = FALSE)
      }
    } else if (is.numeric(station)){
      all_data <- all_data[all_data$`Kod stacji`%in% station, ]
      if (nrow(all_data) == 0){
        stop("Selected station(s) is not available in the database.", call. = FALSE)
      }
    } else {
      stop("Selected station(s) are not in the proper format.", call. = FALSE)
    }
  }

  all_data <- all_data[order(all_data$`Nazwa stacji`, all_data$`Rok`, all_data$`Miesiac`, all_data$`Dzien`, all_data$`Godzina`), ]
  # dodanie opcji  dla skracania kolumn i usuwania duplikatow:
  all_data <- meteo_shortening(all_data, col_names = col_names, ...)
  return(all_data)
} # koniec funkcji meteo_terminowe