[Tagging] [Talk-us] Trunk VS primary

[Andy Townsend]

On 21/12/2019 11:40, Mateusz Konieczny wrote:
>
> 21 Dec 2019, 12:00 by wolfgang at lyxys.ka.sub.org:
>
>     I suggest to keep the road classification consistent at least within
>     a country and try to solve the problem of roads in low-zoom maps at
>     the rendering level, by modifying the list of displayed road classes
>     until a target density of displayed roads is reached. That might
>     become easier to do when we move to vector tiles.
>
> Seems not doable with OSM data - this
> would require far more road classes
> than we use.
>
> lane and surface data is also almost
> certainly not helpful here even with full
> coverage
>
Renderers can certainly use tags other than "highway" when deciding what 
road class to render things as (I do that in a couple places in maps for 
UK/IE but not for trunk/primary, but if I was creating maps for the US I 
suspect I'd definitely try and use other tags along with the highway tag 
to influence road class at motorway/trunk/primary as well).

Specifically, if a tertiary is particular narrow it gets rendered as 
unclassified, and if an unclassified or residential is a gravel track it 
gets rendered as a track with public access. Specifically:

https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/master/style.lua#L928

https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/master/style.lua#L421

The "invented highway tags" set there are then used by

https://github.com/SomeoneElseOSM/openstreetmap-carto-AJT/blob/master/roads.mss

Best Regards,

Andy


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20191221/c3d649d2/attachment.html>