On Tue, Jun 26, 2012 at 7:50 PM, Andrew Harvey <[email protected]> wrote: > The first is you have a feature which was there, but now isn't. i.e. > there was a building, but then it was demolished. What I've done in the > past is tagged (either the object or changeset) as being historical then > deleting it, so at least you can track it down later. > > The second is a current feature that only had some attributes changed. > ie. the road was 2 lane, but then became 3 lane. When you update the > lanes tag to 3, at the moment you can't indicate that this change was > due to a mapping error, or the number of lanes really changed. Nor can > you record the dates/times of the changeover.
Yeah, the difference between the world changing and simply our representation of the world changing. Some people stick a tag like "deletion_reason=building demolished" on there first. No question about it, the fourth dimension introduces a lot of complexities. Sadly, I don't have a lot of faith in the OSM community to come up with a sensible strategy for dealing with all the nuances. (There's a very strong tendency for people to quickly decide on some tags that solve their immediate problem, and not worry much about how those tags work for other people.) Steve _______________________________________________ Talk-au mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-au
