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How big is your file and variable size? Have you used chunking storage? If your file(variable) size is very small, it is not a surprise. HDF5 needs to store the internal metadata in the object header. Also netCDF-4 also stores its own internal metadata. Kent On Tue, May 1, 2012 at 2:15 AM, Denuder Marco <MDenuder@xxxxxxxxxxxxxxxxxxxx > wrote: > Hello > > > > I’ve got a question about the .nc output filesize. When I create a .nc > file out of a .csv file, the .nc file always turns out to be much bigger in > size than the .csv file which is not very logic. Isn’t the binary file > supposed to be smaller than the csv file? I’m talking about an increment in > size of approximately 400%. The more variables I create in the NetCDF4 > format, the bigger the increment in size. > > > > Can anyone tell me if that is meant to be or how I can reduce the size? (I > tried to use the built-in NetCDF4-compression function “zlib”, but the > files turned out to be even slightly bigger than the uncompressed ones) > > > > I work with: > > · Windows (32bit) > > · Python 3.2 using > > o Library: numpy-1.6.1 > > o Library: netcdf4-0.9.6-py3.2 > > > > I wrote the NetCDF4 programs according to this link: > > > > http://netcdf4-python.googlecode.com/svn/trunk/docs/netCDF4-module.html > > > > Thanks a lot! > > > > > > > Please consider the environment before printing this email! > > ------------------------------ > > ***DISCLAIMER*** > > The information and any attachments (herein referred to as 'document') > transmitted is intended only for the person or entity to which it is > addressed. It may contain confidential and/or privileged information. If > you are not the intended recipient of this document, you are hereby > notified that any dissemination, distribution, copying, other use of, or > taking any action in reliance upon this document by persons or entities > other than the intended recipient is illegal and prohibited. If you have > received this in error, please immediately notify the sender, permanently > delete the original from any computer and/or system, and destroy any > printout of the 'document'. We thank you for your co-operation in this > matter. Pilatus Aircraft Ltd. > > _______________________________________________ > netcdf-hdf mailing list > netcdf-hdf@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > -- Kent Yang The HDF Group 1800 So. Oak St., Suite 203, Champaign, IL 61820 217.531.6107 http://hdfgroup.org http://hdfeos.org
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