[OSM-dev] Optimal free compression algorithm for OSM XML data

David Earl david at frankieandshadow.com
Thu May 10 17:18:55 BST 2007



> -----Original Message-----
> From: dev-bounces at openstreetmap.org
> [mailto:dev-bounces at openstreetmap.org]On Behalf Of Nick Hill
> Sent: 10 May 2007 15:54
> To: Shaun McDonald
> Cc: OSM-dev
> Subject: Re: [OSM-dev] Optimal free compression algorithm for OSM XML
> data
>
>
> Hello Shaun
>
> 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:
> http://planet.openstreetmap.org/
>
> The URL for the current planet.osm in 7z format is:
> http://planet.openstreetmap.org/planet-070509.osm.7z
>
> 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.


It took 181 seconds to decompress using a newly downloaded 7-zip from
homepage.mac.com/krmathis referred to from www.7-zip.org/download.html on my
Mac mini intel 1.66 coreduo running MacOS X; head and tail look ok.

David





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