OpenStreetMap
Quick question - how do I map a double mini roundabout, two mini roundabouts which feed into each other with no road in between? At the moment a small road has just been added to separate them, but that's going to be flagged as a road not having a name and therefore an error; it's also not correct.
They're too small to make into proper roundabouts, and you can't have two nodes connected to each other without a way between them.
Incidentally, I spotted they weren't mapped when adding the A99 bus route which embarrassingly goes through an area of Bradford not mapped, the area near my house.
讨论
IgnoredAmbience 于 2009年03月11日 16:50 的评论
Ignore the error, representing it this way is fine. I've had a similar issue, but a barrier is between the two mini-roundabouts osm.org/?lat=51.365831&lon=-0.186636&zoom=18&layers=B000FTTT
chillly 于 2009年03月11日 21:50 的评论
Just draw the roads, with junctions where they should be then mark the junctions as mini roundabouts. This looks like what you have done. The mini roundabouts effectively mark the centre of the junction, their real sizes vary. The fact that there looks like a short road between is a limitation of the representational nature of a map: it is a map not the real world. People, routing s/w and other users of the data will understand perfectly. Eventually we may draw everything as an area rather than simply a line and dots then perfect representation may become a little closer.
zenfunk 于 2009年03月12日 10:39 的评论
Beeing from germany, we don't have many roundabouts here, the concept of double roundabouts seems wickedly complicated. Why would anybody come up with something like this? Or is there something I don't get? Just curious...
Christian
3ld 于 2009年03月12日 19:45 的评论
Hello Christian,
Put your Analyst on stand-by.
Take a look at this junction in Hemel Hempstead in the UK:-
osm.org/?lat=51.74584&lon=-0.47302&zoom=17&layers=B000FTF
This set of mini-roundabouts on a big one has been there since the late 1960s. There is also another similar one in High Wycombe, about 30 Kms away, but I have just noticed that it has not been tagged properly (I do not live there anymore so I am not sure whether it is my place to edit it) so I have not referenced it here.
By the way kaerast, I think that the portion of way between the 2 mini-roundabout nodes should be given the name of the main road that these junctions are on.
Mike
kaerast 于 2009年03月13日 10:56 的评论
3ld - the road changes names between the two mini roundabouts, so the linking road (which doesn't exist) could have either name and still be incorrect. I think Thomas is correct, it doesn't need a name.
3ld 于 2009年03月13日 16:26 的评论
kaerast - don't people make life complicated? Sigh.
zenfunk 于 2009年03月13日 18:04 的评论
@ 3ld:
Thanks for the pic.
In my book, the roundabout in High Wycombe needs you :-).
Just map it, if you got it right, nobody can complain- right?
Cheers, Christian
LivingWithDragons 于 2009年03月14日 09:41 的评论
This is actually a 'magic roundabout': osm.org/?lat=51.467876&lon=-0.423292&zoom=18&layers=B000FTF
There is an island in the middle which you can go round anti-clockwise. Surrounded by lots of mini-roundabouts which you can go round clockwise (you go half way round one to get into the anti-roundabout). If in doubt, you can go clockwise around the edge (technically going round a little bit of each minroundabout), but that would be a long way to take a right turn.
I'd attempt mapping it properly, but I need to survey how many miniroundabouts there are. It might involve taking a photograph, and I should probably be prepared to explain to authorities I'm not a plane-spotter but not a terrorist either (as this is at Heathrow Airport).