On Sat, 23 Aug 2014, Mateusz Konieczny wrote: > 2014-08-23 10:48 GMT+02:00 Richard Z. <[email protected]>: > On Sat, Aug 23, 2014 at 09:08:08AM +0200, Mateusz Konieczny > wrote: > > See > https://wiki.openstreetmap.org/wiki/Talk:Key:surface#maxspeed:practical > > for proposed change > > with 12000 ways already tagged maxspeed:practical and lack of > alternatives > I would think twice removing any documentation. > > > 12 000 ways is really low number in this situation. Surface tag is used on > nearly 9 million roads, number of highway=* ways crossed > 76 million.
Since you go into the realms of "statistics", could you also estimate few things relevant here: - How much out of those 76 million and 9 million highways/surfaced is directly from import or drawn from imagery, and nobody never really surveyed by a mapper on ground? - How much of the remaining you'd expect to need maxspeed:practical? - How much of such ways that would be a candidate for maxspeed:practical, are within reasonable distance from an active enough mapper? ...In particular, I don't think we have that good mapper coverage for rural areas which is likely very very relevant here. - Also many mappers are likely to not know about maxspeed:practical (I suspect this could be seen as supporting your argument too but might also be relevant to explain "low number"). Based on the above realism check to your "statistics", I come to exactly opposite conclusion than you. 12k is a big number. Out of 4.5M ways with maxspeed, a quick calculation yields to 0.25%, IMHO too few zeros were necessary to represent it for it to be a "really low number". I agree with you though that coming up a value for this tag that mappers would agree is unlikely in practice so I don't like/use this tag myself but I can also understand why somebody would want to have such tag. -- i. _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
