On Fri, Nov 7, 2008 at 5:00 PM, Ben Laenen <[EMAIL PROTECTED]> wrote:
> > "only"... does that mean you're going to revisit all 300000 tracks in > Germany to check whether they allow cars or not? The project of No. A German track without a motorcar key will get motorcar=no added, assuming the original survey was correct. If the bot identifies itself properly, mappers will know that no new information was introduced. > > dropping segments didn't have to introduce new information out of > nowhere. > > World-wide only defaults and no country defaults will simply not work: > * certain highways types have certain access rules that are different in > each country, and they can always change later on (and as said before > you won't be able to automagically correct those explicit tags) It's very unlikely that a way will be affected by such a country wide change. It's much more likely that a way was given an incorrect highway tag. If access restrictions are explicitly set, it may mean that the way can still be used for routing. > * not all countries share the same vehicle types, world-wide defaults > cannot handle that If we decide that highway=track defaults to snowmobile=no world-wide, then there's no problem in snowmobileless South Africa. If we decide that motorcycle=no defaults to moped=no world-wide, then there's no problem in countries where moped is not defined by law. > > * different countries, different implicit rules on tags like > access=destination ?? > > * if you'd add motorcar=yes by default for each track, then where does > it stop? bicycle=yes, foot=yes, moped=yes, motorcycle=yes... And then > that complete set of tags for each highway in the world for each > vehicle type there might be on this planet. Just the problem with this This thread is about world-wide defaults, but you're now attacking the idea of explicitly tagging restrictions on the disputed highway types. Either way a small number of highways are affected. And explicit tags will force casual mappers to think about other vehicle types. Of course the problem will be reduced if we let motorcycle=yes default to moped=yes as above. What about the reverse : You download myregion.osm.bz2, but before you can upload it to your GPS, you need countless polygons, wiki exports and libraries. > > is that by having all this data, you actually *lose* information or > you'd have to introduce foot=implicit_yes when it's a road that > implicitly allows pedestrians. But in that case, you can observe the > Perhaps I don't understand : Either a road allows pedestrians, or it doesn't. If you have said JOSM preferences enabled and you want to add a track for which you do not know if motorcars are allowed, then you can indicate this by deleting the tag. On the one hand it's counter intuitive (you're in a hurry and you hit enter without deleting the tag). On the other hand it may encourage you to think even though you visited the site on foot (Did you see a signpost, tire tracks or houses ?).
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