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<div>Which OSM Wiki pages you checked to find out<br></div><div dir="auto"><div dir="auto">reason for existence of things like demolished:building=yes?<br></div><div dir="auto"><br></div><div dir="auto">Recently demolished building may be visible on aerial images<br></div></div><div dir="auto"><br></div><div dir="auto">Using lifecycle prefixes it is possible to clearly mark that specific object must not be<br></div><div dir="auto">remapped without proper verification.<br></div><div dir="auto"><br></div><div dir="auto">Once there is no real risk of remapping them by person thinking that this objects<br></div><div dir="auto">are still existing such elements should be deleted from OSM.<br></div><div dir="auto"><br></div><div dir="auto">Fully gone elements (for example levelled railway embankment replaced by<br></div><div dir="auto">residential buildings) should be deleted from OSM.<br></div><div dir="auto"><br></div><div dir="auto">Is there any OSM Wiki page claiming otherwise?<br></div><div dir="auto"><br></div><div dir="auto">> it is used by Open Railway Maps (ORM)<br></div><div dir="auto"><br></div><div dir="auto">If they want to display also fully gone railway tracks -<br></div><div dir="auto">then they need to use OpenHistoricalMap dataset<br></div><div dir="auto"><br></div><div dir="auto">If they use OSM then they will show only recently<br></div><div dir="auto">demolished one and ones that left traces.<br></div><div dir="auto"><br></div><div dir="auto">Some incorrectly mapped ones may be displayed,<br></div><div dir="auto">but they may be correctly deleted at any moment<br></div><div dir="auto">once this mistakes are spotted.<br></div><div dir="auto"><br></div><div dir="auto">-------------------------------------------------<br></div><div dir="auto"><br></div><div dir="auto">Note that when you found some gone railway<br></div><div dir="auto">mapped in OSM then it is useful<br></div><div dir="auto"><br></div><div dir="auto">- edit OSM object to note which traces are left if any<br></div><div dir="auto">(ideally, it would be done by original mapper)<br></div><div dir="auto"><br></div><div dir="auto">- or delete nonexistent sections without traces<br></div><div dir="auto">and review edits that added them.<br></div><div dir="auto">It is common to see changeset adding<br></div><div dir="auto">400km of destroyed railway without any verification<br></div><div dir="auto">in place, in such case entire changeset should be<br></div><div dir="auto">reverted.<br></div><div dir="auto">Obviously in case of any doubt - comment using<br></div><div dir="auto">changeset comment and create OSM note,<br></div><div dir="auto">then get back to it in some time<br></div><div dir="auto">( <a href="https://www.openstreetmap.org/note/3412415">https://www.openstreetmap.org/note/3412415</a><br></div><div dir="auto">is my latest one, spotted it while mapping something else)<br></div><div dir="auto"><br></div><div dir="auto">Without doing this mappers of railways gone without<br></div><div dir="auto">any trace will easily win. They copy from old<br></div><div dir="auto">maps and can easily mark hundreds of kilometers<br></div><div dir="auto">in one edit.<br></div><div dir="auto">Sometimes they demand to prove nonexistence<br></div><div dir="auto">of railways.<br></div><div dir="auto">But it is fine to remove entire edit if it was done<br></div><div dir="auto">without survey and added features not<br></div><div dir="auto">existing in any way on the ground.<br></div><div dir="auto"><br></div><div>Oct 25, 2022, 09:42 by 61sundowner@gmail.com:<br></div><blockquote class="tutanota_quote" style="border-left: 1px solid #93A3B8; padding-left: 10px; margin-left: 5px;"><div>Hi,<br></div><div><br></div><div>Question:<br></div><div><br></div><div>If OSM is about mapping what exists today .. why have the tags that mean there is nothing left of it?<br></div><div><br></div><div><br></div><div>demolished:*=*<br></div><div> Not existing anymore because of active removal<br></div><div> removed:*=*<br></div><div> Not existing anymore because of active removal (possible duplicate of demolished:*=*)<br></div><div>razed:*=*<br></div><div> Not existing anymore because of active removal (duplicate of removed:*=*, possible duplicate of demolished:*=*)<br></div><div>destroyed:*=*<br></div><div> Destroyed by an event other than active demolition<br></div><div><br></div><div>I think these tags would be of use in Open Historic Map (OHM) and that is possibly why they are in the OSM wiki?<br></div><div><br></div><div>Possibly the OSM wiki should recommend that the data with these tags be moved to OHM?<br></div><div><br></div><div><br></div><div>The argument for mapping these things from the 'old railway' people is that;<br></div><div><br></div><div>1) it does not render on the 'standard map' so it is not a problem.<br></div><div><br></div><div>2) it is used by Open Railway Maps (ORM)<br></div><div><br></div><div><br></div><div>My contention is;<br></div><div><br></div><div>1a) This is a problem when people try to map new things, the old things lead to mapping things that never existed like railway=crossing where a new footway/highway is also mapped over a now non existent railway line.<br></div><div><br></div><div>1b) People mapping new things may not see the old stuff on the new imagery .. and simply delete it, leading to edit wars.<br></div><div><br></div><div>1c) People map things like an old embankment for old railway lines .. right through existing roads<br></div><div><br></div><div>3) Old data should be mapped into OHM so it can be preserved .. together with the start and stop dates .. these 2 tags are fairly well ignored in OSM.<br></div><div><br></div><div>2) ORM should take current data from OSM and old data from OHM. This would add the start/end dates that could be used in ORM to select the time period. Thus those only interested in the present could have that, and those interested in some past date could have that.<br></div><div><br></div><div><br></div><div><br></div><div><br></div><div>_______________________________________________<br></div><div>talk mailing list<br></div><div>talk@openstreetmap.org<br></div><div>https://lists.openstreetmap.org/listinfo/talk<br></div></blockquote><div dir="auto"><br></div> </body>
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