* Nathan Edgars II <nerou...@gmail.com> [2010-07-18 18:53 -0400]: > I'm not so sure we need to use relations. We can use the following > procedure to generate the correct shields: > 1. split the ref tag at semicolons and drop leading spaces
Yeah, that's not hard. > 2. convert I *, US *, and CR/CH/CTH * to shields So you'd suggest doing the Interstates, the US highway network, and county roads, but not state roads? > 3. remove other prefixes, and keep these and non-prefixed numbers in > ovals (there's no reason we need to render the shapes used on signs, > though Virginia and West Virginia may need special rules because their > *secondary* (county-based) routes use circles) Personally, I'd like to see each state's shields used on the map. I suppose there's the argument that someone from, say, Wisconsin might not know what Georgia's shields look like, but I think it should be obvious from context. The problem with using refs to render state shields is that it can be difficult to get the right shield. Some states use the state abbreviation in the road reference (so Maryland route 26 is generally written "MD 26"), but a bunch just use SR (so "SR 10" could be in Alabama, California, Florida, Georgia, Indiana, Maine, Nevada, Ohio, Tennessee, Utah, Virginia, or Washington state route 10). At least the route relations have the state encoded specifically so the specific shield can be used. I think there's more than one that uses "SH", too, and so on. > The main benefit of relations seems to be that the shields are > generated not per way but per route, so four adjacent short ways will > be treated as if they were combined. It may be harder to ensure that > all shields on an overlap are displayed, however. No harder than it is when using refs, at least with Mapnik. You tell mapnik, "use a minimum of this many pixels between repetitions of the same shield, and a minimum of this many pixels between this shield and other shields." As long as there's room enough between repetitions, the overlapping shields will fill in the space. -- ...computer contrarian of the first order... / http://aperiodic.net/phil/ PGP: 026A27F2 print: D200 5BDB FC4B B24A 9248 9F7A 4322 2D22 026A 27F2 --- -- When people were in serious trouble, they went to a witch. (Sometimes, of course, to say, "please stop doing it.") -- _Carpe Jugulum_, Terry Pratchett ---- --- -- _______________________________________________ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
