Am Fr., 15. Nov. 2019 um 12:41 Uhr schrieb Christoph Hormann <o...@imagico.de >:
> Because the basis of most comments made does not seem to be the desire > to neutrally assess the situation Rory presents here and its > implications. > What it seems instead happens here is that people look at the situation > and develop a spontaneous reaction in terms of "should this be possible > or not" and then specifically search for ways to argue in support of > this opinion. I am exempting myself from this, because I would not like Facebook to be able to use OSM data and not follow the license, but I believe they can in this case. ;-) > From an engineering perspective the idea that adding OSM data can create > a derivative database but subtracting OSM data cannot does not hold up > of course. I can create a polygon data set of the Earth surface (a > simple rectangle in EPSG:4326) and subtract an OSM derived data set of > the Earth land masses from that to get a data set of the oceans. > According to the hypothesis this would not be subject to the ODbL. > You are generalizing in a way that is not suitable. What was stated was that there must be OSM data (in original or derived form) in the data to make the license kick in. In the case presented by Rory, IMHO there isn't OSM data in their dataset. It will not be possible to deduct any kind of OSM data from their dataset. In your example, you clearly have derived OSM data in your new dataset, otherwise it wouldn't be possible to get back to the original data (or part of it). The question is not "addition or subtraction", but whether there is data from OSM in the data. Cheers Martin
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