<div dir="ltr">I will submit a talk about the recent Wiki Loves Maps hackathon and the hacks related to historical mapping. For your information, we intend to continue developing at least 3 different hacks started in the context of the hackathon:<div><br><div>- Historical street view, which will be a flow of historical imagery through a crowdsourcing environment (Ajapaik.ee) to geolocate the images and then joining them together in a continuous historical view (Mapillary), with link to/from Wikimedia Commons.</div><div>- A map mashup with information from OHM/OSM, Wikidata and Wikipedia to verify and add information.</div><div>- A historical Journey planner in OHM based on historical maps made available in Wikimedia Commons and other historical data.</div><div><br></div><div>As a comment to Jerry's mail, I would also promote a more distinct source declaration, that could be added to any statement. The interfaces will also need to reflect these requirements: e.g. when tracing a map, the statements will inherit the map as a source and the date of the map.</div></div><div><br></div><div>Because of using snapshot representations of the environment as a source, the start_date / end_date definitions will perhaps need to be complemented with some kind of as_of (date or source) statements.</div><div><br></div><div>Susanna</div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-03-22 16:54 GMT+02:00 SK53 <span dir="ltr"><<a href="mailto:sk53.osm@gmail.com" target="_blank">sk53.osm@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi Tim,<br><br></div>Good idea.<br><br>I've been wondering a bit about what one might call the OHM technical challenges (over & above standard OSM stuff). Aside from the obvious time-slider side of things, there are a couple of others which might be worth mentioning/including in a technical presentation, because they are relevant to OSM but are more apparent with OHMs because of different needs/use-cases :<br><br><ul><li><b>Source/provenance stuff</b>. Most data added to OHM will require a fair degree of research & is not standardly verifiable a la OSM, plus use by digital humanities scholars pretty much mandates a high degree of documentation of the data. I have therefore been thinking a bit about how one might better support this need. A simple way would be to extend the regular OSM schema by introducing a column called <b>metatags </b>on nodes, ways, relations. This would behave exactly as the current tags column except items placed in this data would be meta-data (obvious things like source, attribution, fixme & notes tags in OSM). Effectively the current tags column on the changeset table is only meaningful for metadata tags. I dont know how far such a change would affect the overall API, but for editors the one way of implementing might be to split the current advanced tag entry panes into two. The other would be a toggle to flag individual tags as meta or not. (The ODI OpenAddresses project has some interesting ideas about handling provenance, but I dont know whether they fit readily with primarily user-generated data,<br></li><li><b>Coastlines</b>. Currently coastline handling in the OSM renders is a bit of a kludge. This becomes abundantly clear when one wants to handle changes in coastlines (eg. Isle of Thanet in Roman times, Buenos Aires in late 19th C and Hong Kong in late 20th C).</li><li><b>Map Data Scales</b>. OSM is broadly converging on accurate map detail around 1 m, and technically can go to about 1 cm or less. OHM is quite likely to contain data which is highly accurate (e.g., accurately surveyed archaelogical data) and very general (continent-wide road networks), and they may need to co-exist (Roman period). I imagine we will continue to handle this at the tagging level, and therefore doesn't fall within the ambit of a technical presentation. However, it may be in the future OSM may want to consider a way of handling data at different scales as a way of coping with the generalisation problem.</li><li><b>Historical Gazetteer.</b> Needs mentioning, if only to highlight that retro-fitting temporality into a piece of software is usually hard, whereas if designed in at the outset, the present is only a special case.</li></ul><p>Anyway if you dont use these notes, I will!<br></p><p>Cheers,</p><p>Jerry<br></p></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On 22 March 2015 at 14:26, Tim Waters <span dir="ltr"><<a href="mailto:chippy2005@gmail.com" target="_blank">chippy2005@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Have submitted a talk about the technical side of OHM - and have said it could be bundled up with other OHM talks if necessary.</div><div class="gmail_extra"><br><div class="gmail_quote">On 22 March 2015 at 01:32, Rob H Warren <span dir="ltr"><<a href="mailto:warren@muninn-project.org" target="_blank">warren@muninn-project.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I submitted one today about historical flood mapping using open street map and newspapers.<br>
<br>
Richard, I added in the notes a request for an OHM session. We'll see what happens.<br>
<br>
-rhw<br>
<br>
> On Mar 21, 2015, at 9:00 AM, <a href="mailto:historic-request@openstreetmap.org" target="_blank">historic-request@openstreetmap.org</a> wrote:<br>
><br>
> Message: 3<br>
> Date: Fri, 20 Mar 2015 17:19:24 -0400<br>
> From: Richard Welty <<a href="mailto:rwelty@averillpark.net" target="_blank">rwelty@averillpark.net</a>><br>
> To: "<a href="mailto:historic@openstreetmap.org" target="_blank">historic@openstreetmap.org</a>" <<a href="mailto:historic@openstreetmap.org" target="_blank">historic@openstreetmap.org</a>><br>
> Subject: Re: [OHM] SOTM US proposal deadline<br>
> Message-ID: <<a href="mailto:550C8EDC.1000008@averillpark.net" target="_blank">550C8EDC.1000008@averillpark.net</a>><br>
> Content-Type: text/plain; charset="utf-8"<br>
<div><div>><br>
> On 3/20/15 5:01 PM, Jeff Meyer wrote:<br>
>> Richard - thanks for the reminder!<br>
>><br>
>> Has anyone submitted anything yet?<br>
>><br>
> i submitted mine a couple of days ago.<br>
><br>
> richard<br>
><br>
> --<br>
> <a href="mailto:rwelty@averillpark.net" target="_blank">rwelty@averillpark.net</a><br>
> Averill Park Networking - GIS & IT Consulting<br>
> OpenStreetMap - PostgreSQL - Linux<br>
> Java - Web Applications - Search<br>
><br>
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