Dear all,
I want to use the nccopy script to change the chunking of a large 2D
dataset (first dimension time ("snapshots"), second point index
("gllpoints_all")). The original file has the structure:
$ ncdump -sch original.nc
netcdf original {
dimensions:
snapshots = 820 ;
gllpoints_all = 249984 ;
variables:
// global attributes:
:npoints = 249984 ;
group: Snapshots {
variables:
float strain_dsus(snapshots, gllpoints_all) ;
strain_dsus:_Storage = "chunked" ;
strain_dsus:_ChunkSizes = 1, 249984 ;
} // group Snapshots
For further processing of the file, I want to change the chunks so that
each contains all the time steps at one point.
I do this with
$ nccopy -c "snapshots/820,gllpoints_all/1" original.nc new.nc
However, the resulting chunk sizes are somewhat weird:
{55, 17856} instead of {820, 1}:
$ ncdump -sch new.nc
netcdf axisem_output_3 {
dimensions:
snapshots = 820 ;
gllpoints_all = 249984 ;
// global attributes:
:npoints = 249984 ;
group: Snapshots {
variables:
float strain_dsus(snapshots, gllpoints_all) ;
strain_dsus:_Storage = "chunked" ;
strain_dsus:_ChunkSizes = 55, 17856 ;
} // group Snapshots
Is there an obvious mistake on my side or might there be a problem with
variables in groups?
I am using netcdf library version 4.3.1.1 of Feb 26 2014 12:06:45
cheers,
Simon Stähler
--
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| Simon Stähler PhD student |
| |
| Geophysik, Ludwig-Maximilians-Universität München |
| Theresienstrasse 41 80333 München Germany |
| Tel. : +49 (0)89 2180 4143 |
| www.geophysik.uni-muenchen.de/members/staehler |
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