[Tagging] Sidewalk Tagging for Routing

[Paul Johnson]

On Tue, Nov 24, 2015 at 6:14 PM, Philip Barnes <phil at trigpoint.me.uk> wrote:

> On Tue, 2015-11-24 at 15:22 -0800, Clifford Snow wrote:
> >
> > On Tue, Nov 24, 2015 at 2:12 PM, Tobias Knerr <osm at tobias-knerr.de>
> > wrote:
> > > Sure, but the sidewalk attribute is essential for other, much more
> > > basic
> > > use cases that separate ways fail to serve.
> > >
> > Can you elaborate on why separate ways fail to serve?
>
> They are not matching reality, can cause long detours and poor routing
> unless the mapper provides a lot of connections to the road. Remember
> normal pedestrians can cross wherever they want.
>

Sounds like something any reasonable router should be able to take into
account and recalculate against based on position.  I can rodeo to the
other side of an expressway and a couple freeways to hang a U-turn (with
varying degrees of physical possibility or legal acceptability) in my
region across the grass median but that doesn't necessarily mean that's a
smart move that should be suggested to the average person with no regional
experience.  Likewise, I didn't know jaywalking wasn't a thing in terms of
legal concepts in the UK until this thread and would be more prone to
expect a more comfortable route to where other road users would explicitly
expect me to take such an action.

Point is, the data should be on the assumption of a complete greenhorn or
someone who doesn't necessarily understand how getting around a particular
locale works is using the map.


> There is also the simple rendering issue, roads are already wide and
> are very close or clipping buildings. The sidewalk if mapped in
> position is likely to be hidden under the road.
>

I'm not seeing how this is a data problem.  It still routes, right?
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