2014-05-27 1:48 GMT+02:00 Fernando Trebien <fernando.treb...@gmail.com>:
> Hello everyone, > > From time to time there's a discussion in the Brazilian community on > how to tag an "urban perimeter". In Brazil, this is a legally defined > area with some defined characteristics, such as: > - different kind and level of environmental impact (and therefore > different environmental policies) > - slightly different taxation system for residents > - different maxspeed on highways (mostly determined by being inside or > outside of this perimeter) > > One user has suggested that we use settlement=yes (a proposed tag > still not voted: > http://wiki.openstreetmap.org/wiki/Proposed_features/Urban_settlements) > for that purpose. I'd like to hear your opinions and suggestions. > > Several Brazilian users have mapped the entire urban extension (not > exactly the same as the legally defined perimeter) in small cities and > tagged it using landuse=residential, which is probably wrong in most > cases and can be seen as tagging for the renderer. I believe they're > probably expecting the same visual effect one gets from Google Maps > and Here Maps: both draw a faint grey background over the urban area > and is somewhat distinguishable at the border of most cities. > (Whichever tag we go with, we would then ask rendering engine > developers to replicate that visual effect.) > I don't know in Brazil, but in Italy or Germany the maxspeed for built-up areas does not correspond perfectly with the settlement extension but is indeed yet another thing to consider. It is basically defined by street signs (start / end of a settlement according to the driving laws), and we map these signs on nodes aside the highway with traffic_sign=city_limit (name=*) and split the highway there and map the speed limit as maxspeed=50 (or whatever your default is) and source:maxspeed=IT:urban (or DE:urban etc.) http://wiki.openstreetmap.org/wiki/Key%3Asource%3Amaxspeed (we add those source:maxspeed tags so we could hypothetically adjust the speedlimit in case the law was changed, therefore we also suggest to map source:maxspeed=sign if there is an additional sign which confirms the default). For settlements (in urbanism / settlement geographic terms) my suggestion is to use place=* on an area. Please do not use landuse=residential for huge areas with all kind of landuses inside. cheers, Martin
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