[OSM-talk] Licence of Facebook's derived road datasets? ODbL?

[Wayne Emerson, Jr.]

/>"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, <osm at imagico.de 
> <mailto:osm at imagico.de>> 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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