[Tagging] Equivalence relation (was: Re: Differences in cycleways)

robert at elsenaar.info robert at elsenaar.info
Tue Jan 11 14:55:42 GMT 2011


It was also not my idea to use relations to combine different road  
objects to one road 'relation'.

-Robert-

Citeren Richard Mann <richard.mann.westoxford at gmail.com>:

> On Tue, Jan 11, 2011 at 3:26 AM, Steve Bennett <stevagewp at gmail.com> wrote:
>>  On 11/01/2011 12:20 AM, Richard Mann wrote:
>>>
>>> The user who'd prefer to use highway=cycleway ways doesn't
>>> know that the cycleway=track is a duplicate, but routers only have to
>>> give a slight preference for highway=cycleway over cycleway=track to
>>> use the "right" one (and even if they use the "wrong" one, it doesn't
>>> much matter anyway).
>>
>> IMHO, this is being extremely optimistic about the powers of a router. So
>> you're saying that a router could see the "adjacent=yes", then locate a
>> nearby cycleway which is "adjacent" in some way, and conclude that the two
>> refer to the same thing?
>>
>> My suggestion: let's get a relation happening, asap. Something like:
>
> No, I'm saying the router doesn't need to know. If they have two
> almost identical paths in their network alongside one another, it
> doesn't matter which they pick.
>
> As for a relation - it's too complicated. What happens if the ways are
> different lengths. What happens when someone chops one way in two
> because of something else happening (etc etc etc). Relations are
> inherently complex: only use them for things that people will readily
> understand.
>
> Richard
>
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