It's worth noting that many roundabouts have been split for bridges, tunnels or route relations, thus aren't closed ways.
Shaun On 28 Jan 2013, at 12:08, Peter Wendorff <[email protected]> wrote: > Hi. > I guess most of the roundabouts are not modeled as a relation, and I don't > think that would be necessary. > A roundabout should be a closed way tagged as highway=roundabout. > => to get all roundabouts fetch all ways tagged as such. > > To count all ingoing/outgoing streets for all roundabouts, I would > - fetch all nodes of that roundabout > - for each of these nodes fetch all ways connected to it > - count them. > > Additionally you should > 1) look for oneway tags: only ingoing/outgoing > 2) for dual carriage ways, especially trunk roads, but often in cities that > applies to other road types as well, probably you want to find out if a pair > should be counted as one street only: one ingoing oneway, one outgoing > oneway, usually they are neighboured, roughly pointing to the same direction, > and share the same name. > 3) depending on your use case ignore footways as they are often sidewalks > just crossing. > > regards > Peter > > Am 28.01.2013 12:27, schrieb Martin Alegre: >> Dear all, >> >> I need to generate some statistics on highways. More precisely, given an OSM >> file of a city, I would like to find out which is the average number of >> roads along a junction/roundabout? >> Does anybody has some experience doing that? Given the OSM documentation, it >> seems to be, that the only way to do that is by looking for <relation>'s, >> right? My intuition is that >> if inside a given <relation> ... </relation>, a junction exists, then the >> rest of <way>'s inside that <relation> are the roads along that junction. Is >> this reasoning correct? >> I'm thinking of using Osmium for that purposes. >> >> Best >> >> >> _______________________________________________ >> dev mailing list >> [email protected] >> http://lists.openstreetmap.org/listinfo/dev > > _______________________________________________ > dev mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/dev
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