[Talk-us] While we're fixing things in iterations

[Paul Johnson]

On Wed, Sep 23, 2020 at 5:56 PM Andy Townsend <ajt1047 at gmail.com> wrote:

>
> On 23/09/2020 23:01, Paul Johnson wrote:
>
>
>
> On Wed, Sep 23, 2020 at 4:37 PM stevea <steveaOSM at softworkers.com> wrote:
>
>> Paul Johnson <baloo at ursamundi.org> wrote:
>>
> > 2. Tagging route information on ways.  It's about a decade too long at
>> this point for ref=* on a way to be completely disconnected from the entity
>> the tag applies to:  That's why route relations exist.  Biggest problem
>> child on this at the moment:  OSM's own tilesets.  Let's drop rendering for
>> ref=* on ways and just render the route relations already, this and
>> multipolygons are why relations came to exist in the first place.
>>
>> Yes, 100% agreement.  I think this is simply pure inertia (the kind that
>> says "broken process") on the part of renderers.
>>
>> Can anybody (renderer authors included, maybe even especially) are
>> welcome to offer reasons why "the old machinery" remains in place?  Are
>> there legacy use cases that remain unclear to the wider community?  Please
>> tell us here, if so.
>>
> The US is unusual in that it doesn't have a single ref per section of
> road.  Most places in OSM map what they see on the ground, and the current
> OSM Carto rendering works just fine for them
>
Right up until there's more than one kind of route on the way.

> It's not strictly a Mapnik problem.  It's certainly possible to render
> information from relations in Mapnik (I've done it, for different sorts of
> relations, and written diary entries about it).  There are a couple of
> tricky bits* though:
>
>    1. You'd need to derive the shields from the ref and the road itself
>    from the way, and you're going to get some edge cases where they "don't
>    seem to match".
>    2. I expect that it would be _really_ difficult to render refs from
>    relations in the one country where that's needed and refs from ways in the
>    other 190-odd.  The OSM style is a global style, and that means that local
>    edge cases (which is what the US is here) can't get the "special-case
>    handling" that might be nice.
>
> There's no reason the rest of the world shouldn't be mapping routes this
way.  For the reason I gave above.

>
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