[OSM-dev] Optimal free compression algorithm for OSM XML data
nick at nickhill.co.uk
Thu May 10 15:53:39 BST 2007
Thank you for the pointers for Mac users and 7-zip.
I have uploaded a copy of the current planet.osm as 7z, where I have further
increased compression using bigger dictionary etc.
planet files are at:
The URL for the current planet.osm in 7z format is:
The new file is 183Mb vs Bzip2 235Mb.
You should find both downloading and unpacking the new file faster. Please try
it and give feedback.
Shaun McDonald wrote:
> On 10 May 2007, at 10:38, Nick Hill wrote:
>> Hello David
>> I'll upload a 7z version of the current planet. If nobody finds
>> serious problems
>> with 7-zip, then I'll update the planet creation script to use 7z
> If I remember correctly, you need to install something special to get
> 7-zip to compress/uncompress under Mac OS X. The command line version is
> unfortunately a PPC app, which means that there is a performance hit on
> Intel Macs.
> My search history show that it was:
> It seems that a new version with a GUI and Universal is available at:
> <http://sixtyfive.xmghosting.com/?p=142> though it doesn't have a
> command line interface as far as I can see.
> I have one installed:
> $ which 7za
> $ 7za
> 7-Zip (A) 4.20 Copyright (c) 1999-2005 Igor Pavlov 2005-05-30
> p7zip Version 4.20 (locale=C,Utf16=off,HugeFiles=on)
> Usage: 7za <command> [<switches>...] <archive_name> [<file_names>...]
> Hope this is of some help to some Mac users out there.
More information about the dev