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

Mateusz Konieczny matkoniecz at tutanota.com
Wed Jun 3 10:24:45 UTC 2020

Jun 3, 2020, 07:03 by mark+osm at carnildo.com:

> 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
Very interesting one. While I see point about part of the route, I would
disagree about vertical segment where it is no longer recognizable -
even from indirect effects like building arrangements (based on
this aerial images! - maybe something is visible on the ground or
on higher quality aerial images).

I admit that it is something that while stretching "there is something
on the ground" case is also having something on the ground.

Do you have maybe photos from the ground? Or info where it is located?
I want to add it to the wiki article, it would be a good case of something

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