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Re: Questions

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: Re: Questions
  • Date: Fri, 20 Jan 2006 13:35:26 -0700
Hi Michael,

> Also, I can I have more than 1 unlimited dimension?  I don't need that
> but I'm just curious if it is possible (neat trick if you can).

I'm not sure if you got an answer to the above question.

With netCDF-3, you can have only one unlimited dimension per file.
With netCDF-4, you can have multiple unlimited dimensions in a file,
and a single variable may be extended along multiple unlimited
dimensions.  This is possible because netCDF-4 uses the chunked
storage provided by the HDF5 storage layer on which it is implemented.
An alpha release of netCDF-4 is available for the C and Fortran
interfaces, but the real release and a Java release will have to wait
until after HDF-5 1.8 is released, since we depend on some new
HDF-5 features that we requested to support netCDF-4.

--Russ