Rate of Reading into R from net
? Mon, 14 Nov 2022 13:04:31 +0000 Nick Wray <nickmwray at gmail.com> ?????:
nc_data<-nc_open("
https://catalogue.ceh.ac.uk/datastore/eidchub/2ab15bf0-ad08-415c-ba64-831168be7293/precip/chess-met_precip_gb_1km_daily_19610301-19610331.nc
")
However, when I run this I don't get an error message but R just sits
there with the little red circle (at least 30 minutes for the 90Mb
files)
Not sure why it just sits there, but looking at the package source code, I can see that ncdf4::nc_open eventually forwards its arguments to the nc_open function from the netcdf library: https://github.com/cran/ncdf4/blob/1.19/R/ncdf4.R#L568 https://github.com/cran/ncdf4/blob/1.19/src/ncdf.c#L862 https://docs.unidata.ucar.edu/netcdf-c/current/group__datasets.html#gaccbdb128a1640e204831256dbbc24d3e netcdf does support some form of remote file access, but only OPeNDAP-compatible URLs are supposed to work. Your links ask me to log in, which may mean that they won't work with netcdf. It might be easier to use one of the R packages that let you work with libcurl and give them the cookies from your browser in order to download the files first, then access them. See also: https://stackoverflow.com/a/70368135 What does ncdump say about these URLs?
Best regards, Ivan [1]