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

Phake Nick c933103 at gmail.com
Tue Jun 2 01:52:40 UTC 2020

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.

> Anyway i am against removing apparently useless data without
> > consultation with the author, with the exception of clear errors.
> Disagree.
> Once the data is in OSM it is no longer the 'property' of the author or
> following editors.
> If I am not certain of something I'll ask the author/flowing editors but
> where I know something is wrong I'll change it without consultation.
If you are not sure of the use or validity of something then it would also
be a good idea to ask those who might know about it.

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