[OSM-newbies] OSM Planet

[Tony Morris]

Thanks Richard,
I have scheduled the download of planet-091209.osm.bz2 for off-peak
times (we down under have limits to the amount of traffic we may download).

Working out which diffs and how to apply them looks a bit daunting. I've
installed Osmosis. Thanks for the pointers.

Richard Weait wrote:
> On Mon, Dec 14, 2009 at 8:17 PM, Tony Morris <tonymorris at gmail.com> wrote:
>   
>> I am trying to work out what is required to have my own local planet
>> file then take diff updates.
>>
>> Am I right in understanding that the planet is in a raw form as .osm
>> data (a single XML file?) and that the diffs are patches that I can
>> apply to this file? I see that it is possible to put the OSM data into
>> PostgreSQL, but this seems to be for rendering e.g. Mapnik. Are there
>> any other applications for this? i.e. fast querying of the data perhaps?
>>
>> I'm just looking for where to get started. I understand I'll need to
>> get the initial Planet file from somewhere and it is too big to
>> download (or is it? anyone in the SE Queensland area have it on a HDD
>> that I could copy from?).
>>
>> Thanks for any pointers.
>>     
>
> Hi Tony,
>
> The current planet file is about 7.6GB and you can get it from
> http://planet.openstreetmap.org/
> Planet files are date-coded, and produced weekly, like this one
> http://planet.openstreetmap.org/planet-091209.osm.bz2
>
> Planet is an xml file and is substantially larger when decompressed.
> All those "<" and ">" you see.  A little large to manage.
>
> Diff files are also xml files and are produced for daily, hourly and
> minutely periods, thought there are "catches" to working with diffs.
> You'll want to have a look at
> http://wiki.openstreetmap.org/wiki/Minutely_Mapnik and understand the
> issues around "slow" and "replicate" diffs.
>
> You'll probably use osmosis and osm2pgsql to help you manage your .osm files.
>
> http://wiki.openstreetmap.org/wiki/Osmosis
> http://wiki.openstreetmap.org/wiki/Osm2pgsql
>
> And depending on your area of interest, you might decide to work with
> an extract rather than a complete planet file.
>
> http://wiki.openstreetmap.org/wiki/Planet.osm#Extracts
>
> Best regards,
> Richard
>
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>   

-- 
Tony Morris
http://tmorris.net/