Peter Miller <peter.miller@...> writes: >It it is in a cutting the the 'cutting' tag would be appropriate. because the >layer tag saying nothing about relative height to a parallel way, only about >the z ordering at crossing points.
This is the problem - there are two different conventions for the layer tag which most of the time co-exist, but make it hard to interpret or clean up the data. It can be considered as applying only at crossing points - in which case it makes little difference whether you tag the roads as layers 0 and 1 or -1 and 0, and it makes little difference if the layer=1 extends further along the way than the crossing (in other words you need not carefully split a way into sections, you can just tag layer for a nice long stretch until you get near the next crossing). Or you can think of it as height relative to any *nearby* object, even if not touching. I think we have a mixture of both conventions. Above all, the wiki is not to be trusted - it's worth checking on this list. -- Ed Avis <[email protected]> _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-gb
