[OHM] Open Historical map

[Jeff Meyer]

Hi Jonathan -

Great to hear about your interest & you're asking at just the right time.

We're about to get busy uploading some historical boundaries, and hopefully
also having a time slider to be able to select a view for a particular time
period. Note that I'm saying we're getting busy, but not showing a specific
ETA for having this capability... : ) Hopefully, soon.

Big area boundaries can be tricky to import, though. Do you have experience
with any of the bulk upload scripts? If not, let's talk. I'm going to be
brushing up on them myself this week.

Also, do you have core shapefiles you're working with as a basis for the
import? We could possibly store the data here:
https://github.com/OpenHistoricalMap/data

To answer your questions directly:

1) It should be both realistic and doable, but probably harder than your
typical small-scale OSM-style mapping. Hopefully, we can figure out how to
make that easier at some point here.

2) You should be able to look at whatever sources you can get your hands on
& get cleared copyright-wise. Ideally, your sources will be cc0 or public
domain, but we should also be tagging sources on the OSM-level entities for
now, until we get clearer practices on tagging and citing data. If we store
source data somewhere like the github repo, we should be in pretty good
shape.

3) Regarding moving data from OSM to OHM, I'd highly suggesting adding
license and source tags to all of your points or ways or relations. e.g.
source:openstreetmap, license:odbl. Again... ideally, we'll be getting our
border data from somewhere that is cc0 or public domain. But... based on
what I can see right now, we're going to need to figure out a way to work
with BY-SA sources, as well.

Make sense? I'd love to get some pre-1914 shapefiles of Poland, Germany,
Austria-Hungary, and Russia. Galicia, anyone?

Thanks!
Jeff

On Tue, May 1, 2018 at 12:28 PM, Jonathan Masur <jmasur at bluewin.ch> wrote:

> Hello everyone,
>
> I was told not to upload data of historical boundaries on OpenStreetMap
> because that's not part of the project. Alas, it is hard to imagine today
> for example which parts of Polands used to belong to Germany,
> Autria-Hungary and Russia before 1914, as there is no trace of the previous
> border in the modern world; The former international border could be a
> simple communal border today, or even no border at all as two communes from
> different pre-1914 countries could have merged.
>
> This leads me to being interested in Open Historical Map but alas the
> project seems to be really, really at the stadium of getting started, since
> few things are mapped at all. When it comes to boundaries, there's
> absolutely nothing mapped; except part of the Grand duchy of Baden which I
> previously mapped on OSM and someone tried to transfer it to OHM before
> eventually giving up.
>
> So my questions are:
>
> 1) Is mapping of former countries boundary even realistic/doable on OHM?
>
> 2) Which sources are allowed when doing so? OSM has a very strict policy
> when it comes to sources that outlaws any maps, including old maps; I think
> OHM should allow using maps older than 70 years old (fred of copyright) as
> sources or else it would be very difficult to draw previous borders (but
> still possible, by looking at each commune's history individually).
>
> 3) Is it allowed to import modern communal borders from OSM as a base to
> create relations including the villages which used to belong to a formerly
> exisitng country ? I think this should be possible by doing a normal
> overpass import in JOSM, then reviewing data, then upload to OHM instead of
> OSM. However by doing this I risk pollyting OHM with my first experiements
> as I'm not yet used to work with it.
>
> Best greetings,
>
> --
> Jonathan Masur
>
>
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>



-- 
Jeff Meyer
206-676-2347
osm: Open Historical Map (OHM)
<http://wiki.openstreetmap.org/wiki/Open_Historical_Map> / my OSM user page
<http://www.openstreetmap.org/user/jeffmeyer>
t: @OpenHistMap
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