[OSM-talk] [Osmf-talk] Attribution guideline status update

Christoph Hormann osm at imagico.de
Sun Sep 8 17:39:55 UTC 2019

On Sunday 08 September 2019, Simon Poole wrote:
> /If OpenStreetMap is not the largest data provider for the visible
> map rendering, attribution with other sources on a separate page that
> is visible after user interaction is acceptable./
> [...]

For understanding the practical function of such a rule (and the efforts 
necessary to circumvent it of course) - how do you measure the fraction 
OSM accounts for as data provider for a map, especially if several 
different data types are involved.  If you go by data volume (which can 
be easily changed by several orders of magnitude through geometry 
compression and expansion methods of course) i would probably say i 
have never seen a map with relief depiction (like shading or countour 
lines) where the majority of the data is from OSM.  Any satellite image 
layer with annotation labels and lines (boundaries, roads etc.) from 
OSM would equally be exempt from visible attribution under such rule.

Practically i think everyone should be aware that such rule is a clear 
invitation how to avoid the need for attribution for map producers.  I 
would go as far as saying that no matter how you answer my question as 
to how data fractions are measured any map could be easily modified by 
adding sufficient other data to get the OSM fraction below the 50 
percent limit and this way get off the hook.

As already said i don't see how such a recommendation could in any way 
be considered compatible with the ODbL attribution requirements.

Christoph Hormann

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