[OHM] Moving Razed Railways to OHM – Legal and Technical Matters

[Michael Reichert]

Hi Richard,

Am Wed, 25 Nov 2015 18:11:26 -0500 schrieb Richard Welty:
> OHM and OSM licensing may in the long run not be entirely compatible;
> OHM may be impelled towards public domain type licensing (i'll guess CC0
> but it's not yet decided) for various reasons. it's a topic we have
> discussed a bit, and a reason why most of us are very careful about how
> we source OHM data. just copying stuff from OSM is likely to cause
> trouble in the long run. on the other hand, since the contributors of
> the railway data are mostly well known figures, you can ask them for
> permission; it's their contribution after all.

Well, this means that an 1:1 import is not possible?

What about adding a source=* to all the importing changesets in order to 
be able to easily redact them if OHM changes the license? I know that it 
is hard to force all mappers to do it but the amount of abandoned 
railways is such small that you can just watch the OHM diff files and 
revert all those changesets which are clearly a OSM copy but do not have 
a source=OpenStreetMap.

>> Is it just enough to copy the tags 1:1 and add start_date=* and
>> end_date=*?
> OHM would probably not use the abandoned/razed tags, but instead tag
> them as if they existed; start/end date take care of the rest.

This means that railway lines which are abandoned nowadays should be 
tagged as railway=rail + end_data=1978? This makes rendering a little bit 
more difficult but it is a solveable problem.

Best regards

Michael