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
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