On 26.08.2010 22:25, Peter Wendorff wrote: > My approach would be - and I would like to get your opinions on that: > - a sidewalk is tagged like every other footway > highway=footway|path > (foot=yes) > (segregated=yes|no) > footway=sidewalk > name=NAME-OF-STREET
I understand why you like this approach: The mappers will essentially draw the routing graph for you. ;-) Generally, individual ways for sidewalks and cycleways make it easier to use the data for navigation, while adding tags (or relations) to the roads themselves appears somewhat easier for renderers. I happen to write a (3D) renderer at the moment, so I assume this will create some challenges for me. Simply drawing the footways and roads independently will certainly look bad - there will either be gaps between the sidewalk and the road or they will overlap. Unless, of course, the distance between the sidewalk way and the road way is exactly half the sum of their respective width tags' values ... which is unlikely, to say the least. *g* So I will need to associate sidewalks with road sections. And therefore > - no geometric analysis necessary (finding parallel streets to unnamed > footways) ... I *will* need to do geometric analysis. It's still possible, though (or so I hope, at least...), so your proposed solution would be acceptable for me. It's actually nice that it works well with today's editors, while other approaches require editor or even API improvements. This will probably lead to fast adoption by mappers. > 2) dedicated sidewalks make it a lot more simple to tag crossing details > like islands etc. Could you describe crossing layouts in more detail? I assume you would model them like this A B C | | | | | | *--o--* | | | | | | where A and C are sidewalks, B is a road, and *o are junction nodes. If we use the existing tagging for crossings, then node o should be tagged highway=crossing + crossing=island/... So how would you tag the horizontal way? May I suggest that it is tagged differently from A and C to make it easier to distinguish in software? Tobias Knerr _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
