> I have a grib file of 7 Gb. Can NCL split this file into smaller pieces, either
> by retaining the format or by converting it to NetCDF? Current NCL functions
> seem not to be supporting files larger than 2 Gb. If NCL cannot handle files
> like this at all, could you suggest a way for doing this task?
> _______________________________________________
[1] smaller grib files
NCL does not write GRIB so the answer is "no".
[2] It could be converted to netCDF. However, the file
size would be larger. NCL supports netCDF files
greater than 2GB but no single variable can be > 2GB
GRIB's strength is that it is efficient at storing data.
Convert GRIB to float and storing as netCDF usually
results in a netCDF files that is 2-3 time larger
than the original GRIB file.
[3] suggestion ... use "wgrib" to partition the grib file
into smaller files.
http://www.cpc.ncep.noaa.gov/products/wesley/wgrib.html
see the "tricks" section
ftp://ftp.cpc.ncep.noaa.gov/wd51we/wgrib/tricks.wgrib
[4] comment: GRIB is a record format not a file format.
In fact, it only recognizes 2-dimensional horizontal grids.
NCL scans the grib records and creates the multidimensional
records that look like netCDF variable/files.
Perhaps an NCL developer can add more?
Regards,
D
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Received on Fri Mar 09 2007 - 07:41:17 MST
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