[OSM-dev] Max size of changeset with josm (in kb)

Chris Jones rollercow at sucs.org
Sun May 31 17:52:58 BST 2009


On 31 May 2009, at 15:40, Sam Vekemans wrote:

> Hi,
> I already got part of the answer - 50,000 (things; nodes, lines, areas
> -total) so now i want to know, what approx size (in mb, kb) is safe?
> I loaded a changeset of 358 kb and it seemed happy. Would 1 meg be  
> too much?

Size all depends on the volume of tags attached to the objects.

> I know that there is a max geographical download area built in, (it's
> say's "download area OK, size probably acceptable by server") but is
> there a time out or an exact max file size to download? (a squak
> level) (i know that i download a large area when im tracing from my
> GPS Tracks.  (Victoria is about 8 megs) and so it takes a little time
> to load, so i dont load that big area any more, i just open that old
> Victoria file, then zoom to the area im working in, then get the
> latest updates for that small area.

There a limits (on the main api) on both area 0.25 degree squares and  
number of objects returned.

See http://api.openstreetmap.org/api/capabilities

> Also, is there an easy way i can chop the .osm file into 4 or 16 happy
> geographical area chunks? Thus, smaller file sizes to deal with.

Osmosis - http://wiki.openstreetmap.org/wiki/Osmosis

--
Chris Jones, SUCS Admin
http://sucs.org






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