Mary Haley wrote:
Hi all,
This is a bit of a late announcement, but NCL V4.3.1 and PyNIO V1.2.0
have support built-in for reading and writing netCDF-4 classic files
on systems where netcdf-4.0-beta1 is supported.
With NCL, you can write a netCDF-4 classic file by calling the
"setfileoption" procedure with the "format" option before you call
"addfile" to create a netCDF-4 classic 4 file:
setfileoption("nc","format","netcdf4classic")
a = addfile("file.nc","c")
You can further specify a compression level:
setfileoption("nc","compressionlevel",5)
Similar code exists for PyNIO:
import Nio
opt = Nio.options()
opt.Format = "netcdf4classic"
opt.CompressionLevel = 5
fout = Nio.open_file("file.nc","c",opt)
For more information, see the NCL "setfileoption" or PyNIO documentation:
http://www.ncl.ucar.edu/Document/Functions/Built-in/setfileoption.shtml
http://www.pyngl.ucar.edu/Nio.shtml
For download:
http://www.ncl.ucar.edu/Download/
http://www.pyngl.ucar.edu/download.shtml
Cheers,
--Mary
Mary: Can you turn the shuffle filter on with setfileoption? I've
found that it can really improve the compression ratios when used in
conjunction with zlib compression in netcdf-4 files.
-Jeff
--
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
NOAA/OAR/PSD R/PSD1 Email : Jeffrey.S.Whitaker@xxxxxxxx
325 Broadway Office : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web : http://tinyurl.com/5telg
