Select data from the daily dataset
ghcndSelect(
gzfile,
variable = c("TMIN", "TAVG", "TMAX"),
station = NULL,
qflag = "",
verbose = TRUE,
astype = as.integer
)if more than one variable, it returns an array whose dimentions are days, stations, variables. If one variable, then it returns a matrix whose dimentions are days, stations.
the local filename for the daily data file file. E.g. 2023.csv.gz from the daily GHCN data repository at NCEI-NOAA, at "https://www.ncei.noaa.gov/pub/data/ghcn/daily/by_year/". Please see the references bellow.
string with the variable name(s) to be selected
string (vector) with the station(s) to be selected
a string with quality control flag(s)
logical indicating if progress is to be printed
function to convert data to a class, default is set to convert the data to integer.
It can take time to execute if, for example, the data.table package is not available.
The default selects TMIN, TAVG and TMAX and return it as integer because the original data is also integer with units in 10 Celcius degrees.
Menne, M., Durre, I., Vose, R., Gleason, B. and Houston, T. (2012) An overview of the global historical climatology network-daily database. Journal of Atmospheric and Oceanic Technology, 897–910.