[Talk-us] armchair mappers putting errors back into the map

[Nick Bolten]

Absolutely! I may have miscommunicated.

I want the exact same thing: for it to be easier to tag "missing"
infrastructure.

I'm just remembering my many attempts to evaluate sidewalk network
completeness (that's highway=footway objects), and it's not easy. But I
don't want to launch another discussion about pedestrian tagging standard!
I'm just saying that having a dedicated way or point that says, "this thing
does not exist here" can be useful, but there are no current standards for
doing so that I'm aware of.

It's subtle: sidewalk=no/none on a road says, "this road does not have
sidewalks", whereas a dedicated way for a sidewalk (footway=sidewalk) that
said, "this sidewalk does not exist" displaces the expected location of a
sidewalk. The latter has its own (big) issues, but I think the problem is
worth exploring. For the sidewalk case: how can we related metadata of one
thing (in this case, a street) to another (a sidewalk) help mappers create
consistent and accurate data? For the nonexistent street case: how can we
specify that this piece of infrastructure does *not* exist when there is no
metadata from which to guess (as we had in the case of sidewalks) and the
current appropriate schema is, "this is a blank area of the map with no
data".

On Sun, Mar 3, 2019 at 11:22 AM Andy Townsend <ajt1047 at gmail.com> wrote:

> On 03/03/2019 18:43, Nick Bolten wrote:
> > As I mentioned, I'm aware of hacks regarding sidewalks
>
> I wouldn't describe sidewalk=none as a hack - speaking as someone who
> walks a lot, any verifiable tag that says "you're allowed to, but you
> probably don't want to walk down this road" is really useful.
>
> Best Regards,
>
> Andy
>
> PS: I'm not trying to make any point about how to map the presence of
> sidewalks here (we don't need to dredge that up again) I'm just saying
> that mapping the absence of them is useful too.
>
>
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