[Talk-GB] worrying edit to junction (now reverted)

[Jon Pennycook]

I assumed that Amazon were adding all roads because either the people are
incentivised to add as much as they can, whether useful or not; or it was
for their self-driving vehicles which potentially could be taking employees
to sewage farms.
Amazon are getting better at adding access tags, but it's annoying when
they add a farm track which links to two roads without an access tag, and
CycleStreets sends me down the farm track instead of the road (I think
CycleStreets assumes all roads are 30mph unless specified, and 30mph is
taken as better for cycling than the 60mph road).

Amazon aren't alone in adding all road-like objects in a particular area -
Mapbox do the same from time to time.

Jon

On Wed, 20 Jan 2021, 17:42 Andy Townsend, <ajt1047 at gmail.com> wrote:

>
> On 20/01/2021 14:34, Tom Hughes wrote:
> > On 20/01/2021 12:22, Andy Townsend wrote:
> >
> >> https://www.openstreetmap.org/user/VLD071 doesn't mention Facebook
> >> directly either, but does mention's Facebook's "black hole" address
> >> "osm at fb.com".
> >
> > He also says he's working on their AI mapping but the wiki page he
> > refers to doesn't mention the UK and it's hard to see why they would
> > want to let it loose on a well mapped country or why it would be a
> > good idea to do so.
> >
> > My main question is, what exactly led to them armchair mapping a
> > junction in a well mapped area of London? I can understand that
> > once they were looking at it they mistakenly used out of date
> > imagery, but what led to them looking at it in the first place...
>
> All the examples I've seen of "Facebook_AI-Assisted_Road_Tracing"
> (whether done by Facebook or by other mappers) in the UK have been
> problematical, for a couple of reasons. One reason is that any actual
> roads have already been added pretty much everywhere in the UK, and if
> there's something detected as "new", it's likely a false positive, or
> something not really worth adding (for example, I've seen gaps between
> lorries in agricultural stackyards added as "roads" this way)
>
> Another is that FB's "detected roads" are based on an old Esri layer,
> and seem to be offset wherever it is used.
> https://overpass-turbo.eu/s/12Be is the originally added position (in
> this case by an Amazon mapper using Facebook's "AI") of a concrete track
> in a sewage works up the road from me.  It's not offset by much, but
> it's enough to be annoying.  Exactly why an Amazon mapper expected to be
> delivering parcels around the back of a sewage works (inside a locked
> gate) I have no idea.
>
> Best Regards,
>
> Andy
>
>
>
>
>
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