[OSM-talk] Extracting a BBOX from an osm change file

[Phil! Gold]

* Rodolphe Quiedeville <rodolphe at quiedeville.org> [2011-03-11 13:39 +0100]:
> I want to know if changes files from
> planet.openstreetmap.org/hourly-replicate/ are useful for a BBOX. My
> first idea wass to to this with osmosis, if someone give me a hint.

You can't apply a bbox to a change file.  Change files basically contain
the IDs of changed objects and their current properties.  Notably, they do
not contain the old properties of the objects, so osmosis cannot tell in
all cases whether an object should be considered to be in or out of the
bbox.

If you're using osm2pgsql, you just have to apply the full change files.
You can syill use osm2pgsql's bbox, which will restrict the data in the
rendering tables (but the tables for slim mode will gradually accumulate
data from outside the bbox that will only go away if you do a dump and
fresh reload from a planet extract).

-- 
...computer contrarian of the first order... / http://aperiodic.net/phil/
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