Hi Markus, you were right. I tried osmfilter and so far it seems that it has worked as expected. Thanks for your help.
Curt PS: Why is there that strict limit of parsing an osm file up to 12 times? -----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Gesendet: Sonntag, 7. August 2011 20:13 An: Curt Nowak; [email protected] Betreff: Re: [OSM-dev] Extracting just national boundaries Hi Curt, > 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. This is a good description of osmfilter's algorithm. ;-) The program stores the interrelation dependencies in a temporary file and parses this file up to 12 times. > If I have enough time (likely I won't) I might try to write an osmosis > plugin for this. Why? I thought, Osmosis would already be able to perform this task...? Markus -------- Original-Nachricht -------- > Datum: Sun, 7 Aug 2011 19:25:51 +0200 > Von: Curt Nowak <[email protected]> > An: "[email protected]" <[email protected]> > Betreff: Re: [OSM-dev] Extracting just national boundaries > 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 [[email protected]] > Sent: 06 August 2011 17:44 > To: [email protected] > 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 > [email protected] http://lists.openstreetmap.org/listinfo/dev > > _______________________________________________ > dev mailing list > [email protected] http://lists.openstreetmap.org/listinfo/dev _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
