2015-01-27 17:13 GMT+01:00 Mike Thompson <miketh...@gmail.com>: > > The way in OSM is only a (sometimes not precise) drawing of an existing > feature and can be different from the reality. > > How precise is the value of the "length" tag? From what is the value > derived? >
to make sense on ways, I'd expect it to represent either a measurement in the real world (e.g. with tape) or the indication you can get from a sign (e.g. length of a bridge). Measuring e.g. in JOSM or GIS from the cartography or from imagery or calculating it from the coords does not make sense (but I doubt people do it like this). cheers, Martin
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