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Re: Hmmmm. Can rad handle the new 88d stuff yet? (decoder?)
- Subject: Re: Hmmmm. Can rad handle the new 88d stuff yet? (decoder?)
- Date: Tue, 7 Nov 2000 09:01:25 -0600 (CST)
I have not had a chance to look at the data yet, but I think Bob's
observation may be the key. ZLIB always refers to the compression
scheme used by gzip (because gzip uses zlib).
On Mon, 6 Nov 2000, NIMBUS Librarian wrote:
>
> Folks,
>
> Don't forget that you need to account for the WMO header
> at the front of the data... it's not compressed, so it'll
> need to be stripped out first.
>
> Bob Lipschutz
> FSL
>
>
> >
> > In a previous message to me, you wrote:
> >
> > >
> > >Pete...
> > >
> > >You are trying to make things too complicated. Most data compression
> > progr
> ams
> > >have some easy of way of sending uncompressed data to stdout. The ones
> > tha
> t
> > >I know about are:
> > >
> > > Scheme Command to use
> > > pack pcat
> > > compress zcat
> > > gzip (ZLIB) gzcat or zcat (depending on how it was built)
> > > bzip2 bzcat
> > >
> > >The only one that I can't find a way, (at least via the man pages that I
> > ha
> ve)
> > >is "zip".
> > >
> > >As a sample:
> > >
> > > cat file.gz | gzcat
> > >
> > >would get you the ungzipped version of "file".
> >
> > Hi Kevin,
> >
> > That's not exactly the problem here. The NEXRAD files are not
> > zip'd files, they just happen to use one of the same compression
> > algorithms that zip does. They are not in 'zip' format, so
> > the stdio version (funzip on unix) doesn't recognize them.
> >
> > >
> > >By the way, if you really want to program via ZLIB, just use "gzopen" and
> > >"gzread". It is easy to do using these calls.
> >
> > That would work if the files were in gzip format, but they aren't,
> zlib used to use gzip format but apparently it now uses the
> > deflate/inflate algorithms, so I don't think gzopen and
> > gzread will do it...
> >
> > There are other routines in the zlib library to inflate
> > deflated data, it's just a matter of writing the program
> > to call them.
> >
> > Am I way off base here?
> >
> > Pete
> >
> >
> > >
> > > Kevin W. Thomas
> > > Sun System Administrator & Meteorologist
> > > National Severe Storms Laboratory
> > > Norman, Oklahoma
> > >
> > > Email: address@hidden
> >
> >
> > --
> > +>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>+<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<+
> > ^ Pete Pokrandt V 1447 AOSS Bldg 1225 W Dayton St^
> > ^ Systems Programmer V Madison, WI 53706 ^
> > ^ V address@hidden ^
> > ^ Dept of Atmos & Oceanic Sciences V (608) 262-3086 (Phone/voicemail) ^
> > ^ University of Wisconsin-Madison V 262-0166 (Fax) ^
> > <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<+>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>+
>
--------------------------------------------------------
David Wojtowicz, Sr. Research Programmer/Systems Manager
Department of Atmospheric Sciences Computer Services
University of Illinois at Urbana-Champaign
email: address@hidden phone: (217)333-8390
--------------------------------------------------------