<div dir="ltr"><div><div><div><div>Hello,<br><br></div>in the past we talked about the notion that an OSM mapper can say "here's a building that's been demolished, let me archive this in OHM" and press a button in JOSM, where it asks for any temporal data given (assumption of end_date is the date of addition) and for that building to be added to OHM. This would be of benefit to both OSM and OHM, and could likely help OHM grow. <br><br></div>I've always personally considered it a possibility that OHM would be a place to show everything that used to exist, and theres only a little step towards this should also include things that existed in the past and which also exist now, e.g. a castle, a road, a coastline. If would of course be much bigger than OSM in terms of data...<br><br></div>Licensing - given OHM's close association with OSM I think past discussions have sided towards that it would most likely be ODBL. I generally think ODBL is where its most likely to be, if not explicitly set out. <br></div><div>I think getting people interested and mapping is more important than setting a license at this time though.<br></div><div><br></div><div>Interesting story: The first data in OHM were actually from OSM - they were a couple of Burning Man Playa plans from different years mapped and added by Mikel who hacked on OHM early on.<br></div><div><br></div><div>Most historical data, at least the historical maps are public domain / cc0, however - so there is an argument to have it as open as possible. I think in that situation, that the project would limit itself to those eras, in the UK that would be around 1930, and therefore not include OSM data at all. But this wouldn't be ideal as I think having the ability to use OSM data is worth a slightly more restrictive licence. Consider mapping many European cities where the majority of the buildings are over 100 years old. <br></div><div><br></div><div>The situation is murky as in all my face to face talks about OHM the most interest has been about old stuff and historical mapping, both from geographers, historians and technologists and that's where I'd like to see the focus on. I've no objection to ODBL it seems to have worked well for OSM! We'd have to ask these interested parties - I don't think they share their data or if they do release it, they don't care about open data - being stuck in their own academic silos.<br></div><div><br></div><div>Regards,</div><div><br></div><div>Tim<br></div><div><div><br><br><br><br><div><br><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 17 November 2017 at 03:13, Richard Welty <span dir="ltr"><<a href="mailto:rwelty@averillpark.net" target="_blank">rwelty@averillpark.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span>On 11/16/17 5:20 PM, David Wisbey wrote:<br>
> So far I haven't been able to make much of this Open Historical Map.<br>
> I am a huge contributor to Openstreetmap and would also like to help<br>
> with OHM. It occurred to me that it would make very good sense to use<br>
> deleted features from OSM.<br>
</span>there are intellectual property considerations. i'm not sure we ever came to<br>
a final decision, but OHM is pretty likely to end up with something like a<br>
CC0 license. it would not be appropriate to take ODBL licensed data from<br>
OSM into OHM without explicit permission from the original mapper.<br>
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richard<br>
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