On Tue, Dec 15, 2009 at 11:36 PM, John Smith <deltafoxtrot...@gmail.com> wrote: > Without layer information you'd be guessing if the road goes over the > water or the water goes over the road, or the water and road are at > the same level. > > You could come up with sane defaults,
That's the right thing to do. > but that's making assumptions Not if you document them. I agree that you can't leave everything up to interpretation, but a road and a waterway crossing without a junction is, by convention (and rather reasonably so), a road crossing over the water. If nothing else, it's a far more frequent scenario than continuously pouring across a public road, and there's a tag for that. > rather than tagging explicitly so you know beyond a reasonable doubt. This isn't Law&Order. The whole tagging system is a means whereby humans can store facts about the world efficiently, in order that they can be used unambiguously by tools such as renderers. For that to work, we need good documentation of what the tags mean, and how to interpret them. Steve _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
