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

[Mike Thompson]

I have had a problem with other mappers adding things back into OSM that
still appear in some of the imagery available to OSM, but where newer
imagery (or recent survey) show that such things no longer exist.  I
initially tried mapping these with just the OSM geometry and a note=* tag,
but it seems that one of the QC tools considers these to be an error, and
someone was going around deleting these.  I have started adding a
"removed:*=*" tag, e.g. removed:building=yes along with a note=* tag
explaining.  Technically I am mapping things that no longer exist, but the
purpose is to make it less likely that other well intentioned mappers undo
my (and others) work and make the map less accurate.

Mike

On Thu, Dec 31, 2020 at 1:40 PM Joseph Eisenberg <joseph.eisenberg at gmail.com>
wrote:

> I actually think it should be deleted entirely since nothing remains of
> the right-of-way at the spot in the link, but I left it for a (bad)
> example:
>
> https://www.openstreetmap.org/way/13375829/#map=19/33.78089/-118.15134
>
>
> On Thu, Dec 31, 2020 at 11:47 AM stevea <steveaOSM at softworkers.com> wrote:
>
>> Thank you, Joseph, for recently editing that to railway=razed (and
>> removing the erroneously entered usage=main tag).  In this case, the tag
>> railway=razed accurately captures the semantics of this rail right-of-way.
>>
>> SteveA
>>
>> > On Dec 31, 2020, at 11:38 AM, Joseph Eisenberg <
>> joseph.eisenberg at gmail.com> wrote:
>> >
>> > Re: "the traces of rail ballast in the soil, the signs of deteriorated
>> embankments, cuttings and ditches, and so on all are clear signposts"
>> >
>> > Yes, it's fine to map an abandoned railway in that case.
>> >
>> > However, I don't think they should be in the database when the
>> right-of-way has been completely re-graded and the land has been
>> re-developed, with new streets and buildings, totally eliminating the old
>> features.
>> >
>> > E.g.:
>> https://www.openstreetmap.org/way/13375829/#map=19/33.78089/-118.15134 -
>> this is miss-tagged as an abandoned railway in this segment.
>>
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