On Wed, 3 Jul 2019 at 16:16, marc marc <[email protected]> wrote:
> Le 03.07.19 à 16:55, Paul Allen a écrit : > > What "unsigned" doesn't do is identify how the mapper came to any > > conclusion about the weight > > limit or how other mappers may verify it. > > unsigned just said "no info on the ground" > The same can be achieved by omitting the tag. Possibly supplemented with a fixme. A fixme is better because quality tools can help mappers see where more information is needed. the panel may have fallen, stolen or not yet installed, > the unsigned key says nothing else. > It does when, as seems to be implied by you, an object can end up with maxweight=3.5 + unsigned=maxweight without telling anyone how or why the mapper decided that the maxweight is, in fact, 3.5. Moreover, when you notice that a bridge has no sign, you generally > cannot deduce anything more than "there is no sign". Actually, it's worse than that. Because you cannot deduce what the absent sign is about. Is it an absent sign for a speed limit, or a weight restriction, or something else? I'd expect, for modern bridges on modern roads, the speed limit of the road as appears on signs somewhere (possibly a long way) before and after the bridge applies to the bridge itself. I'd only expect speed limit signs on the bridge if the limit is lower than for the rest of the road. By your logic, though, I should tag modern bridges on modern roads with unsigned=maxspeed. Similarly, when I do a survey and I notice that a house does not have the > usual > sign indicating its house number, I can said that the sign is not there. > Which would be a little annoying around here, because maybe a tenth of the houses do not have numbers, only names. Most of those name-only houses have never had numbers. You think it sensible to tag unsigned=addr:housenumber for those? Many houses around here have numbers without names. You think it sensible to tag unsigned=addr:housename for those? > another time, with another source (official or local knowledge), > this information could be completed (no limit, no number, no name,...) > with another key. the unsigned key doesn't try to solve others issues. > one type of information -> one key > I don't think it actually solves any issues that are not better handled with a fixme or a source tag, or simply omitting the tag. -- Paul
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