[OSM-legal-talk] Interesting use case of combining OSM with proprietary data

[Christoph Hormann]

Today i stumbled across this:

https://map.ox.ac.uk/research-project/accessibility_to_cities/
http://dx.doi.org/doi:10.1038/nature25181
https://explorer.earthengine.google.com/#detail/Oxford%2FMAP%2Faccessibility_to_cities_2015_v1_0

Apart from partly insufficient attribution (which i already contacted 
the author about) this is an interesting case example of combining OSM 
with proprietary data sets i would like to hear some opinions about.

What is done here is combining road information (and some other data) 
from OSM and proprietary data sources (Google) into a raster map (made 
available as 'friction surface' under the first link above) and doing 
further processing, analysis and map rendering based on that and 
publishing the result.

My interpretation of the ODbL here is that this is a share-alike case 
that would require the combined data sources to be made available.  But 
you could probably also look at it differently.  I would like to hear 
opinions on this.  In particular if you think that is legally possible 
without share alike how this interpretation looks like.

-- 
Christoph Hormann
http://www.imagico.de/