/>"I don't understand why it is being claimed that facebook ... is not
using Openstreetmap data."/
The original claim was not about facebook "using" OSM data, it was
that a specific dataset was "derived" from OSM data. To use the cooking
analogy, a cake is derived from flour, oil, sugar, etc. It is not
derived from spoons, bowls, pans or flour-sifters. In this case, OSM
data was used as a sifter to decide which of their data to subtract from
their data.
/>"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."/
This might make sense in autocad which has cutting operations, but
makes no sense in OSM. The operation described would require *adding*
all lines tagged in OSM as "natural=coastline" to your dataset. Facebook
is not inferring the shape of their streets based on OSM data.
As far as the licensing, it appears to me to only apply to the software
(RapiD) not the data. But it should be more explicit.
https://github.com/facebookmicrosites/Open-Mapping-At-Facebook
https://github.com/facebookmicrosites/Open-Mapping-At-Facebook/blob/master/LICENSE.md
The license summary says that it only requires preservation of copyright
and license notices.
https://github.com/facebookmicrosites/Open-Mapping-At-Facebook/wiki/FAQ
The real question should be: When the RapiD software is used to add
their street data to OSM does it tag the street with copyright and
license notices?
For the record, I do not like facebook. I have never had a facebook
account and never will.
On 11/15/2019 8:03 AM, Nuno Caldeira wrote:
Well it's quite obvious to me that for adding or subtracting you need
OSM data, so I have no doubts. it's like a cook recipe, if you don't
have use it, you won't get the end result without it, adding or
subtracting.
On Fri, 15 Nov 2019, 11:41 Christoph Hormann, <[email protected]
<mailto:[email protected]>> wrote:
This realization (of there being no fundamental difference between
subtracting and adding) is - as Rory already explained - not
dependent
on specific details of the ODbL or the law but derives from
elementary
logic.
--
Christoph Hormann
http://www.imagico.de/
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