Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
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
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