2009/11/3 Randy <rwtnospam-new...@yahoo.com> > I might also tag a short section of the highway as "covered" in your first > example, http://de.wikipedia.org/wiki/Br%C3%BCckenrasthaus_Frankenwald. > Granted, that would be tagging for the renderers, because I am aware they > have a real technical problem with properly rendering layers.
well, they would have less problems if they accepted layers, but their rulemakers decided to ignore layers and render streets always above buildings, that's where the problem arises (OK, otherwise the street would be covered, also not the best solution). The best solution would be if the rendering engine would itself detect hidden lines and render them as interrupted lines or the like, but that's for the wishlist ;-) > And, that if > I was a purist, I would not do that. However, it is not an untrue tag, and > I'm an engineer, not a scientist. > I'm also an engineer (well, kind of). In Germany tunnels are defined in some standard (DIN 1076), but I'm aware that these standards are not valid all over the world. English wikipedia gives some tunnel definitions: "A *tunnel* is an underground passageway. The definition of what constitutes a tunnel is not universally agreed upon. However, in general tunnels are at least twice as long as they are wide." till here I think it can be agreed on: 1. underground passage 2. at least twice as long a wide the rest is more open to variations (e.g. in Germany the min. length for an underpass that was excavated openly and then closed would be 80 metres to be called a tunnel), and probably should be dealt with less strict: "In addition, they should be completely enclosed on all sides, save for the openings at each end. Some civic planners define a tunnel as 0.1 miles<http://en.wikipedia.org/wiki/Mile>(0.16 km <http://en.wikipedia.org/wiki/Kilometre>) in length or longer, while anything shorter than this should be called an *underpass* or a chute<http://en.wikipedia.org/wiki/Chute_%28gravity%29>. For example, the underpass beneath Yahata Station<http://en.wikipedia.org/wiki/Kagoshima_Main_Line>in Kitakyushu <http://en.wikipedia.org/wiki/Kitakyushu>, Japan<http://en.wikipedia.org/wiki/Japan>is only 0.08 miles (0.13 km) long and therefore should not be considered a tunnel."... cheers, Martin
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