[IGS-DCWG-58] Change in compression scheme at IGS data centers

[Carey Noll]

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IGS-DCWG Mail      30 Mar 11:23:01 PDT 2010      Message Number 58
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Author: Carey Noll/CDDIS

    Over the years we have discussed updating the compression
scheme used within the IGS to a more modern utility. I would
once again like to visit this topic. Of course any change
such as this would have to be rolled out over time but, at
the CDDIS at least, we are thinking about changing the
compression used in older data sets and then migrating more
recent data over time, closely coordinating with our various
user communities. Any new method should be integrated (or
freely available) in the OS of major platforms (Linux, UNIX,
Windows, OS X). Staff here are recommending bzip. This
utility is available on Linux, UNIX, and OS X releases and is
available for free for Windows. We have seen an improvement in
compression by 20-30% using bzip on our limited tests. I would
be interested in any thoughts on this proposal as well as any
other commonly available utilities that could be considered.

Regards,
Carey.
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Ms. Carey Noll
Manager, Crustal Dynamics Data Information System (CDDIS)
Secretary, ILRS Central Bureau
NASA GSFC
Code 690.1
Greenbelt, MD 20771
USA

E-mail:  Carey.Noll at nasa.gov
Voice: (301) 614-6542
Fax: (301) 614-6015
WWW:  http://cddis.gsfc.nasa.gov