Setup the global variables for NOOA GHCN data
nooa_ghcn_setup_variables( dat_flag = "noaa_ghcn_daily", data_dl_method = "libcurl", metadata_dirname = "metadata", url = NULL )
dat_flag | (character) : "noaa_ghcn_daily" (default) name of the data - will appear as data folder name when data are saved |
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data_dl_method | (character) : "libcurl" (default) data download method |
metadata_dirname | (character) : "metadata" (default) metadata folder name |
url | (character) : NULL (default) data url - the default one is encoded in the function body |