<div dir="ltr"><div>On Sat, 5 Jun 2021 at 07:27, Kyle Hensel via Tagging <<a href="mailto:tagging@openstreetmap.org">tagging@openstreetmap.org</a>> wrote:</div><div><br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div class="gmail-m_5018728197312383088WordSection1">Some of the suggestions:
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<p class="MsoNormal">1. survey_point:condition=destroyed</p>
<p class="MsoNormal">2. former:man_made=survey_point (or a similar lifecycle prefix)</p>
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<p class="MsoNormal">I think the first option is better since a 'destroyed' survey marker is still a valid survey point - Michael has explained this well in an earlier message:
<a href="https://lists.openstreetmap.org/pipermail/tagging/2021-June/061700.html" target="_blank">
https://lists.openstreetmap.org/pipermail/tagging/2021-June/061700.html</a></p></div></div></blockquote><div><br></div><div>I'm not sure that survey points for which there are no visible traces are</div><div>mappable in OSM as such. OSM is a map of visible objects (that's a</div><div> simplification, but close enough for this). I can understand</div><div>why these positions are important to surveyors, but I don't think they meet</div><div>OSM criteria for mappability (I could be very wrong about that).</div><div><br></div><div>I can justify mapping some (not necessarily all) destroyed survey points</div><div>with a lifecycle prefix to prevent them being resurrected by armchair mappers.</div><div>I can't justify mapping destroyed/invisible survey points just because they</div><div>were (and perhaps still are) used in surveys. Surveyors have official</div><div>databases of these and don't need OSM to locate them. If there really is</div><div>a need to integrate such a database with OSM there are tools like</div><div>uMap and Leaflet that would allow that to be done.</div><div><br></div><div>BTW, there are records of Ordnance Survey cut marks in buildings</div><div>where it is noted that the building itself has been destroyed. No</div><div>matter how important that point was to past surveys, it is no longer</div><div>there and I don't see how it could be considered usable. Historical</div><div>interest, perhaps, but we don't map history.<br></div><div><br></div><div>-- <br></div><div>Paul</div><div><br></div><br></div></div>