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Re: multi-file interface

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  • Subject: Re: multi-file interface
  • Date: Tue, 31 May 1994 11:21:09 -0600
> Organization: Battelle, PNL
> Keywords: 199405311629.AA07222

Hi Srinivas,

> I was reading the HDF3.3r3-netCDF interface implementation, it says one
> can access multiple netCDF files at the same time.  Is it possible to have
> multiple netCDF files (objects) in one HDF file ?  The HDF documentation
> is not complete as regards to netCDF interface.

For a definitive answer, contact the NCSA developers of this implementation,
but I don't think the current implementation supports multiple netCDF
objects in one HDF file.  If it did, there would have to be some way to
specify to ncopen() which of the multiple netCDF objects you wanted to open
in a file, and currently the ncopen() function as implement4ed on HDF has no
parameter or syntax for this, as far as I know.

> The usage.txt at ucar ftp site says that SSESCO has implement a meta-file
> layer called "MRAF" to do just what I need.  Is that in public domain ?

No, SSESCO only makes their software available commercially, as far as I
know.

If you need freely available software, you might also check out Envision,
described at 

    http://sslab.colorado.edu:2222/projects/Envision_toc.html

It implements an abstraction that permits accessing a multi-file collection
of netCDF datasets as if it were only one file.

__________________________________________________________________________
                      
Russ Rew                                              UCAR Unidata Program
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