[Tagging] Forward/backward routes
pelderson at gmail.com
Mon Aug 19 23:22:30 UTC 2019
Well, the simple version I got from bicycle route mappers is: members in the main direction have no roles. The fact that there is a role tells you it’s a way for the opposite direction, and then forward tells you the opposite travel direction goes against the mapped direction of that member way, and the backward role tells you the opposite travel direction goes with the mapped direction of the way.
I don’t see the merit of this... Who or what needs this information? Roles should simply tell you the role the way plays in the route. Then you need only one: backward. Everything that’s not backward is the main (forward) route. Further, all members without a role should add up to one linear chain. All members with a role, being the deviations for the opposite direction, that could be a lot of small chains and even single ways. I am sure data users have means to determine which parts of the forward chain should be used reversely to produce the complete route for opposite direction. Maybe the order of the ways is a clue?
Mvg Peter Elderson
> Op 20 aug. 2019 om 00:28 heeft Kevin Kenny <kevin.b.kenny at gmail.com> het volgende geschreven:
>> On Mon, Aug 19, 2019 at 6:05 PM Volker Schmidt <voschix at gmail.com> wrote:
>>> On Mon, 19 Aug 2019 at 15:21, Kevin Kenny <kevin.b.kenny at gmail.com> wrote:
>>> ... when the forward/backward roles do not indicate the direction of travel, as is the case with bicycle routes.
> That was Peter Elderson, not me, so I'll defer to him for an answer to
> your question.
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