OK, Clifford, I take your point very well. It may not be one-off,
but when routing algorithms chase data in this way, we CAN say it
comes close to "tagging for the algorithm" and is therefore to be
discouraged. But this might be considered a sharpening up of the
data in a perfectly valid way which also supports routing algorithms.
How about a sane tagging scheme that will capture highway=ferry_link
similar to highway=motorway_link? That's off-the-cuff, but might be
enough. I think there was talk of this (or something similar)
earlier, I'd have to go back in the threads and look.
Concomitantly, routing algorithms can and should pay attention to
said tagging scheme.
SteveA
California
On Thu, Nov 7, 2013 at 8:49 AM, stevea
<<mailto:[email protected]>[email protected]> wrote:
A very big +1 to this. "Posing a challenge" to the construction of
an accurate routing algorithm is a poor excuse to propose rippling
through data changes for what would essentially be a one-off
convenience. Greg Troxel's suggestion about
regular->service->regular and regular->service->ferry sounds
perfectly reasonable and can certainly be made to work for this
particular case. Inside of a routing algorithm is exactly where
this sort of decision-making belongs, not by making data changes
that are more convenient for it.
I disagree that we are making one-off change. What we are doing is
making the map more useful. When adding an access ramp to a motorway
we call it a motorway link. The waiting area for ferries is a
similar feature of a ferry route. It certainly isn't a service road
except in a broad sense. There was agreement to tag the
service=ferry to solve the problem. That wasn't my first choice but
it works.
There is a push in OSM to include addresses. One of the big
advantages we gain is the ability to route from door to door. For
that we need ferry routing. Living in an area with one of the
largest ferry systems in the world[1], I appreciate efforts to solve
the problem.
[1]
<http://en.wikipedia.org/wiki/Washington_State_Ferries>http://en.wikipedia.org/wiki/Washington_State_Ferries
--
Clifford
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