[Talk-GB] Potentially incompatible edits in West London

[Andy Townsend]

Hello Andrew, hello everyone else.


I've not done a "big revert" yet; I've concentrated on trying to work 
out how to do that without adversely affecting everyone else's work, and 
as I'm sure you've guessed, it's been more of a background job rather 
than originally intended.  Despite warning of a "potential hole 
appearing in the data in West London in a few days time" back in April 
last year, I now hope that I'll be able to restrict changes to problem 
keys only, and only deal with problem imagery where specific problems 
have been reported, like https://www.openstreetmap.org/way/144667839 in 
the example below (note that https://www.openstreetmap.org/way/996697879 
in the same changeset matches the claimed Bing imagery).


Best Regards,


Andy



On 29/01/2023 18:01, Andrew Hain wrote:
> Is the mapping in West London now in a state where mappers can build 
> on it without risking their edits getting lost?
>
> --
> Andrew
> ------------------------------------------------------------------------
> *From:* Andy Townsend <ajt1047 at gmail.com>
> *Sent:* 18 April 2022 12:44
> *To:* Talk Gb <talk-gb at openstreetmap.org>
> *Subject:* [Talk-GB] Potentially incompatible edits in West London
> Hello - especially to mappers in London.  Andy from OSM's Data Working
> Group here.
>
> There's been a suggestion that mapper that has been very active in West
> London* https://www.openstreetmap.org/user/Mikhail1412 has been using
> various sources that aren't compatible with OSM. Attempts to contact the
> mapper via
> http://resultmaps.neis-one.org/osm-discussion-comments?uid=2055614 have
> mostly been unsuccessful, although a local mapper has managed to get
> replies to some private messages (which unfortunately do also suggest
> that they're using incompatible sources).  It has been suggested that
> https://www.openstreetmap.org/user/Mik1412 is another account by the
> same person.
>
> Attempts by the DWG to get the mapper to interact with the community
> have failed: https://www.openstreetmap.org/user/Mikhail1412/blocks ,
> hence a "block until they engage with us" message at
> https://www.openstreetmap.org/user_blocks/5919 .
>
> I had hoped that we'd be able to revert and redact certain classes of
> data only (see e.g. comment on
> https://www.openstreetmap.org/changeset/113072980 ).  However, the
> problematic changes include geometric changes too - it has been said
> that the latest change to https://www.openstreetmap.org/way/144667839
> (see the top-right corner of
> https://overpass-api.de/achavi/?changeset=113007152 ) isn't possible
> based on imagery available to OSM because of tree cover. That edit is
> unlikely to be based on survey as the mapper concerned apparently hasn't
> been in London since late 2019 (due to the pandemic etc.).  Some other
> changes seem to match Google Street View and not a more recent survey.
>
> It therefore looks like we'll have to revert (and likely redact) most or
> all of this mapper's changes since the beginning of 2020, unless we get
> a reason not to from a reply to
> https://www.openstreetmap.org/user_blocks/5919 .  I'm sending this
> message for a few reasons:
>
> * to encourage mappers in West London to comment on this user's
> changesets, both where the data appears not to be based on sources
> available to OSM but also where it can be validated by e.g. survey.  I
> don't expect that you'll get a reply, but those comments will be
> extremely useful to us and to everyone else in the area.
>
> * to give everyone a chance to tell me if I've got anything wrong
> (please reply on this list if that's the case).
>
> * to give everyone a bit of a warning of a potential "hole" appearing in
> the data in West London in a few days time.
>
> I won't start any wide-scale revert for a week or so to give the mapper
> concerned yet another chance to reply.  I have already reverted (and
> redacted) some changes in
> https://www.openstreetmap.org/changeset/115296538 where there were
> specific reports about individual pieces of data.
>
> Best Regards,
>
> Andy
>
> * more recently the same mapper has been active in France - I've also
> asked them for the sources of their edits there.
>
>
>
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