On 21/12/2019 11:40, Mateusz Konieczny wrote:
21 Dec 2019, 12:00 by wolfg...@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
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