Hello Igor and Peter, I'll take a look into --cascading-relations. Maybe I can adapt something from there. I'm thinking it should be possible in two consecutive runs over a pbf/osm file: 1.Run: Read all relations and store their dependencies (maybe in a very simple database, or even in RAM) Then figure out which relations you *really* need. 2. Run: Filter these relations.
If I have enough time (likely I won't) I might try to write an osmosis plugin for this. Thanks for your help. Curt ________________________________________ From: Igor Podolskiy [igor.podols...@vwi-stuttgart.de] Sent: 06 August 2011 17:44 To: dev@openstreetmap.org Subject: Re: [OSM-dev] Extracting just national boundaries Hi, On 06.08.2011 17:38, Peter Körner wrote: > Am 05.08.2011 17:24, schrieb Igor Podolskiy: >> Basically, to implement a >> --used-relations you need to compute the transitive closure of a >> possibly cyclic graph with relations as nodes and memberships as edges, >> and this is not trivial if all you have is a data stream and no loops - >> which is the Osmosis model. > > Osmosis does something very similar in its --cascading-relations option, > did you try that? yes, I know about --cascading-relations, but it's a --bounding-box option, not a standalone task. On the other hand, you're right, you always could do something like --bbox -90,-180,90,180 cascading-relations=yes and have something like --used-relations - thanks for the pointer! Igor _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
