2015-02-16 10:42 GMT+01:00 Martin Vonwald <imagic....@gmail.com>: > Hi! > > I just stumbled upon the wiki article regarding maxwidth:physical. From > reading it - and the articles about maxwidth and width - I don't really > understand when to use each key. > > My understanding so far: > * width: this is the actual width of a feature >
+1 > * maxwidth: this is a legal limitation; nothing wider than the given value > may use the feature > +1, there is also the synonym "maxwidth:legal" (IMHO not advisable, as this is the same than the more used "maxwidth") > * maxwidth:physical: according to the wiki page: a physical limit > IIRR there were users of latin american countries telling that their bridges sometimes had 2 height informations signposted: maxheight and maxheight:physical and that this was the reason for the introduction of maxheight:physical (I assume that maxwidth is working just the same). > > The width of a feature in my understanding is a physical limit. > -1, the "width" is one dimension of a feature (depending on the kind of thing you are describing, there are other dimensions like height, length, diameter, depth, etc.), I wouldn't call this (in all cases) a "limit" So when should maxwidth:physical be used? One example I can think of might > be a way with varying width, i.e. it is not possible to specify "width" and > maxwidth:physical should be used to specify the minimum width along the > way. Another one might be the maximum width of a vehicle, that may pass a > barrier (this is indicated in the first sentence of the article). > if there was something tagged like (example made up): barrier=bollard width=0.2m maxwidth=1.2m I'd expect the width to be the width of the bollard and maxwidth the (in theory "legal") width of the vehicle that can pass through (e.g. number taken by reading off a sign) and you might want to add maxwidth:physical=1.22m (the actual maximum width of a vehicle or person that can pass through). cheers, Martin
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