[Tagging] Route members: ordered or not

Yves yvecai at gmail.com
Thu May 3 18:05:42 UTC 2018


@Volker, no need to classify all possibilities, it's certainly endless :-)

I wrote 'order at best' cause of course some cases are tricky.
That being said, the (few) route relations I take care of I take the time to reorder them before upload, it's easy in JOSM. All have a beginning and a start, most loops and some take the same way twice in opposite direction.
Yves 

Le 3 mai 2018 18:42:38 GMT+02:00, Volker Schmidt <voschix at gmail.com> a écrit :
>I will try to explain this in a more systematic way:
>
>Routes belong to either of two categories:
>(A) Those whose members can be sorted into a single ordered sequence
>(B) Those that cannot be sorted into a single ordered sequence of
>members
>Sorting makes only sense for category (A)
>Routes of type (B) can be subdivided into routes of type (A), each of
>which
>can be sorted, but the overall route can not be sorted.
>
>Routes are of type (A) if
>(1) the path from begin to end is identical to the reverse path with 
>all
>members traversed in the reverse order and in the opposite direction
>or
>(2) all members have the role forward
>or
>(3) all members have the role backward
>
>Any route
>(1) that has more than two ends
>or
>(2) that contains any loop (except the case that the entire route is a
>single loop)
>or
>(3) that contains any element with role forword or role backward
>(except
>the cases of all-forward or all-backward)
>or
>(4) that contains node or area elements
>is of type B
>
>I am not sure if I have taken care of all cases - please complete as
>necessary

Yves
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