[Tagging] [OSM-talk] Should we map things that do not exist?

[Mark Wagner]

On Tue, 2 Jun 2020 12:39:14 +0200 (CEST)
Mateusz Konieczny via Tagging <tagging at openstreetmap.org> wrote:

> Jun 2, 2020, 03:52 by c933103 at gmail.com:
> 
> >
> >
> > 在 2020年6月2日週二 09:26，Warin <> 61sundowner at gmail.com> > 寫道：
> >  
> >> On 30/5/20 12:48 am, Volker Schmidt wrote:  
> >>  > My main point is that out there are things that consist of
> >>  > visible objects plus objects which have left visible traces,
> >>  > and also some pieces that have been completely erased, but of
> >>  > which we have documented knowledge of where they once were. The
> >>  > entire thing makes sense only with all its parts. These things
> >>  > be of interest for some end users of OSM data, and hence, if
> >>  > someone has gone to the length of mapping them, should find
> >>  > space in OSM. In my view a general rule that any mapper can
> >>  > erase any object from the map, when he does not see any trace
> >>  > of it, is certainly not correct , he may be removing parts of
> >>  > the thing thsat only with all its partsmakes sense.  
> >>  
> >>  
> >>  Where an old railway line has been built over by houses,
> >> factories, shops and roads I see no reason to retain the
> >> (historical) information in OSM.
> >>  
> >>  The old railway station that still exists at one end - yes, but
> >> where there is nothing, not even a hint, left then no.
> >>  
> >
> > Except, it is relatively common for traces of old railway remain
> > visible even after new development (e.g. house, factory, shop,
> > road) have been made on top of their original site. So that cabnot
> > be used as a criteria to determine whether that should be removed
> > or not although the exact situation varies a lot in each individual
> > cases. 
> 
> Can you give an example (photos) where entire factory was constructed
> over former railway and this section of railway remains somehow
> mappable in OSM?
> 
> With road I can easily imagine this, with a single small building I
> can also imagine special cases of this remaining true.
> 
> But entire factory?

It's not a factory, but how about a car dealership, two storage rental
facilities, a school bus parking lot, a sports park, and about forty
city blocks of other things?

https://imgur.com/a/5YObPTP

-- 
Mark