2014-12-04 1:42 GMT+01:00 François Lacombe <fl.infosrese...@gmail.com>:
> just imagine a city like vienna, drawing one or more man_made=pipeline >> ways parallel to nearly every highway=* - a nightmare, editing-wise. >> >> in these cases, it would be better to use the already existing >> highway=* way and also tag it as man_made=pipeline. and here we have >> the first name=*, ref=* conflict, only to be solved by prefixes. >> > > I don't agree here. > Mapping two different features with one OSM object shouldn't be done, > especially for a pipeline vs a street > +1 > Both don't have the same location (one underground, one IS the ground). > well, this depends on your point of view, the "highway" might be interpreted as reaching into ground (that's actually the case, even if most people think of a road as being the surface you step / drive on), might even be seen as including drainage tubes / ditches and other stuff that is there in order to make the road work (or because the road and therefor a right of way is there, e.g. subways or pipelines or other infrastructure like water, sewage, power, telco, gas, ...) Still I do agree with François, we should not see it this way in OSM, as it calls for problems and will cause these problems (it becomes unclear to what a tag refers). I believe we should use relations to create objects which rely on the geometry of other objects (if they happen to be on the same spot), ie. here I'd create a relation for the pipeline with the road as member (presuming for this example that the position is identical, what it probably not is in reality). The tag "highway" is not for the complete "road" as described above, it only represents the part that is for bicycles, cars, pedestrians, etc. cheers, Martin
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