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<div class="moz-cite-prefix">On 17/05/2022 15:27, Simon Poole wrote:<br>
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<blockquote type="cite"
cite="mid:cb745028-2243-c69c-66c0-562dbaca349a@poole.ch"><br>
Obviously common sense should be applied, but as you correctly
note changing 10k objects globally is touchy, particularly when
there is no clear root cause. So as a first step I would try to
determine if there is a reason for the mistagging and if yes fix
that first, it might be as simple as a typo in a preset.
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<p>To get an idea of the source of the problem it's possible to just
select one value from<br>
</p>
<p><a class="moz-txt-link-freetext" href="https://taginfo.openstreetmap.org/keys/building%3Alevel#values">https://taginfo.openstreetmap.org/keys/building%3Alevel#values</a></p>
<p>and sample the results. Taking "4" as an example,</p>
<ul>
<li>The originating editor seems to be either iD or JOSM (probably
more iD than JOSM, but I presume more buildings are added with
iD than JOSM)</li>
<li>The originating date is a fairly wide range. Some are 10
years old, some recent.</li>
<li>There are more errors where English isn't a first language</li>
</ul>
<p>There is a "long tail" of silly values (the previously mentioned
"-1" on page 1, and also others starting on page 2 of
<a class="moz-txt-link-freetext" href="https://taginfo.openstreetmap.org/keys/building%3Alevel#values">https://taginfo.openstreetmap.org/keys/building%3Alevel#values</a> )
that need looking at in more detail.</p>
<p>It's pretty clear what
<a class="moz-txt-link-freetext" href="https://www.openstreetmap.org/node/2517761586/history">https://www.openstreetmap.org/node/2517761586/history</a> is trying to
say with "building:level" and it's not "this building has -1
levels".</p>
<p>I'm sure that it would be possible to do a sensible mechanical
edit here that fixed <a class="moz-txt-link-freetext" href="https://www.openstreetmap.org/way/160054444">https://www.openstreetmap.org/way/160054444</a>
but left some of the others, but it wouldn't just be "change all
key X to key Y" worldwide.</p>
<p>Best Regards,</p>
<p>Andy</p>
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