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Re: reading gziped CDFs [message #34254 is a reply to message #34120]

Thu, 27 February 2003 10:40

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

"erikb" <erikb@bu.edu> wrote in message news:b3k5k4$cva$1@news3.bu.edu...
> Hi all,
>
> I've got a question that google can't answer, so I'm posing it to
> you:
>
> I have gziped CDF files that I would like to open without having to
> manually unzip them for space considerations. I know that IDL can
> handle opening gziped files with the /compress keyword to the open
> routines, but that doesn't help with a CDF. I see that my ver. of
> IDL (5.4) has a CDF_compression command, but it seems that this is
> an internal compression method within the CDF structure.

Yes. The CDF format supports compression of each variable
internally. I haven't used this feature for a long time, but I see
from the IDL documentation that it allows a number of compression
methods including GZIP, so it should be pretty effective. Is there any
possibility of (re)writing your files using CDF compression? Then you
might not need to gzip them.

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		reading gziped CDFs By: erikb on Wed, 26 February 2003 20:50
		Re: reading gziped CDFs By: K. Bowman on Thu, 27 February 2003 10:43
		Re: reading gziped CDFs By: Mark Hadfield on Thu, 27 February 2003 10:40
		Re: reading gziped CDFs By: Rick Towler on Thu, 27 February 2003 09:26
		Re: reading gziped CDFs By: Kenneth P. Bowman on Thu, 27 February 2003 04:22

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