2012/10/28 Frederik Ramm <frede...@remote.org>: > On 27.10.2012 17:53, "Petr Morávek [Xificurk]" wrote: >> 2) Boundary relation or place=* for higher administrative units? >> The overlap is especially visible in case of countries (but same >> arguments apply for other units like states, counties, ...). >> Majority of counties are in database represented twice - as node with >> place=country and with admin_level=1 boundary relation. > > > Note however that there is no 1:1 relationship between place=... and > admin_level - e.g. something on admin_level 8 could be a place=city or > place=town, or (in Germany) something on admin_level can be a place=state or > place=city capital=yes or so.
+1, there could also be several places (e.g. villages or towns) within the same admin_level-8 entity. Place is a more open and less defined concept, geographical places (toponyms), who depend on different cultural factors, while administrative division is a clear and well defined order (at least usually there are clearly defined and codified borders), besides some disputed areas where things are not that clear in this layer either. IMHO places could on the longer run be approximated by areas as well, even if their borders are not as clear as they are for administrative boundaries (it's a wiki and it will evolve to some compromise that is acceptable for most). For "routing" you don't really need a point in the center, normally you would have a more precise address where you want to go, and in the absence you could just as well use an arbitrary node to route to (e.g. centroid, or the label-node position), for rendering it is also not strictly necessary, but if you wanted to have a node for the label why not simply tag it like this? (place-label). In the end a place is never a "point", and if you nonetheless need one for your graph-model, you can take any arbitrary point that makes sense ;-) cheers, Martin _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
