[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[netCDF #TLB-677315]: FW: Net CDF-4 Issues

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 Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated.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: [netCDF #TLB-677315]: FW: Net CDF-4 Issues
  • Date: Fri, 17 Apr 2009 10:34:35 -0600
> Hi Coy,
>
> It appears we got your email support question from a week ago, but it
> "slipped through the cracks" and didn't get a quick response.  Sorry
> about that.
>
> > The problem I was having was due to two calls using the same string.
> > This works in NetCDF-3 but causes NetCDF-4 to throw an error when
> > calling nc_enddef. It seems odd that the second call below did not
> > return an error since it was the cause of the problem. I fixed this by
> > simply changing "Mode" to "ModeNumber" in the second call.
> > iReturn = nc_def_dim (m_iNcFileID, "Mode", NC_UNLIMITED, &m_iDim_Set);
> > iReturn = nc_def_var (m_iNcFileID, "Mode", NC_SHORT, 1, aURI,
> > &m_iModeNum);
> > iReturn = nc_enddef(m_iNcFileID);
>
> It's a netCDF convention that a variable with the same name as a dimension
> represents a coordinate variable.

Howdy Coy!

Thanks for finding this bug. I have fixed it in the netCDF codebase, which
means it is available in the daily snapshot release if you wish to give it a
try:
ftp://ftp.unidata.ucar.edu/pub/netcdf/snapshot/netcdf-4-daily.tar.gz

However, I think you should not use a variable with the same name as a
dimension, unless that dimension is one of the ones used by that variable. This
violates a strong netCDF convention and is likely to cause confusion for
software and users who encounter this data.

Thanks,

Ed

Ticket Details
===================
Ticket ID: TLB-677315
Department: Support netCDF
Priority: Normal
Status: Open