Hi, > Am I right in assuming that OSM ways always belong > to one single area?
Yes and no. Normally we don't map the borders between areas - we map tha areas themselves. So you would have one way that encloses the forest, and one way that encloses the adjacent farmland, and they would "meet" somewhere. There are exceptions to this rule when it comes to very large entities like counties or countries; in these cases we tend to actually map the border line and tag it with something like "left: France, right: Germany", and there will be no single polygon named "France" or "Germany". Coastline is another exception. > If this is so, do I have to duplicate ways along the > common border? JOSM informs about double ways when it validates > data so > I had the slight impression that they are not really wanted. There is no 100% consensus on how to deal with these things but most people, including me, suggest to duplicate ways (not nodes) along the common border, i.e. you will have two ways sharing the same nodes. The issue is especially contended when it comes to linear features straddling areas, like a road that forms the forest boundary for a bit. I would re-use the same nodes here, but there are people who say that this would indicate the forest stretching up to the road centreline which of course isn't true, and they would rather have the road and the forest boundary run in parallel and use their own nodes. Bye Frederik -- Frederik Ramm ## eMail [EMAIL PROTECTED] ## N49°00'09" E008°23'33" _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
