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<div class="moz-cite-prefix">Hi.<br>
I guess most of the roundabouts are not modeled as a relation, and
I don't think that would be necessary.<br>
A roundabout should be a closed way tagged as highway=roundabout.<br>
=> to get all roundabouts fetch all ways tagged as such.<br>
<br>
To count all ingoing/outgoing streets for all roundabouts, I would<br>
- fetch all nodes of that roundabout<br>
- for each of these nodes fetch all ways connected to it<br>
- count them.<br>
<br>
Additionally you should<br>
1) look for oneway tags: only ingoing/outgoing<br>
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.<br>
3) depending on your use case ignore footways as they are often
sidewalks just crossing.<br>
<br>
regards<br>
Peter<br>
<br>
Am 28.01.2013 12:27, schrieb Martin Alegre:<br>
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<blockquote
cite="mid:CAPKW8o3jd13wi34iV0ZQU93RdYPT6xoHC7g9j-3DScYxaa2pDA@mail.gmail.com"
type="cite">Dear all,<br>
<br>
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?<br>
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<br>
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?<br>
I'm thinking of using Osmium for that purposes.<br>
<br>
Best<br>
<br>
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