[OHM] Open Historical map

[Jonathan Masur]

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