[GRASS-user] Copy an existing location

[Bartolomei.Chris]

Hi Rainer,
I had stated that I wasn't 100% sure and just to look into it - I had recalled reading about lossy and lossless data some time ago.
For a quick look into it, Wikipedia has a decent article (https://en.wikipedia.org/wiki/Lossless_compression and https://en.wikipedia.org/wiki/Lossy_compression) ... as I briefly looked through it just now, it appears gz and zip use a lossless algorithm so they should be fine to use. Tar (if I remember right) concatenates files into an archive and is not a compression tool.
It looks like lossy algorithms are used more for music and video and some images according to the articles.
I was just putting up a yellow flag as a caution to look into it as I wasn't sure and I wouldn't want to give someone bad advice.

Chris Bartolomei P.E.
Engineer/Scientist
ENSCO, Inc.
bartolomei.chris at ensco.com
________________________________________
From: Rainer M Krug [Rainer at krugs.de]
Sent: Friday, April 29, 2016 12:35 AM
To: Bartolomei.Chris
Cc: Janet Choate; grass list
Subject: Re: Copy an existing location

"Bartolomei.Chris" <Bartolomei.Chris at ensco.com> writes:

[snip (4 lines)]

> The reason I say this is the file
> compression I suggested may cause some data loss ... look into
> lossless data compression algorithms and you'll see what I'm talking
> about.

Could you please elaborate and give some references where lossless data
compression (gz, zip) may cause data loss? Especially tar.gz is used for
ages in archival and backup?

Rainer


[snip (46 lines)]
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Rainer M. Krug
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