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. [email protected] ________________________________________ From: Rainer M Krug [[email protected]] Sent: Friday, April 29, 2016 12:35 AM To: Bartolomei.Chris Cc: Janet Choate; grass list Subject: Re: Copy an existing location "Bartolomei.Chris" <[email protected]> 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)] -- Rainer M. Krug email: Rainer<at>krugs<dot>de PGP: 0x0F52F982 The information contained in this email message is intended only for the use of the individual(s) to whom it is addressed and may contain information that is privileged and sensitive. If you are not the intended recipient, or otherwise have received this communication in error, please notify the sender immediately by email at the above referenced address and note that any further dissemination, distribution or copying of this communication is strictly prohibited. The U.S. Export Control Laws regulate the export and re-export of technology originating in the United States. This includes the electronic transmission of information and software to foreign countries and to certain foreign nationals. Recipient agrees to abide by these laws and their regulations -- including the U.S. Department of Commerce Export Administration Regulations and the U.S. Department of State International Traffic in Arms Regulations -- and not to transfer, by electronic transmission or otherwise, any content derived from this email to either a foreign national or a foreign destination in violation of such laws. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
