Am 05.11.2013 um 21:29 schrieb Christoph Hormann <chris_horm...@gmx.de>:

> It is also important to keep in mind that in case of borders 
> authoritively defined through discrete points an officially released 
> data set does not necessarily represent exactly this definition.


And sometimes "official" or "authoritive" is not sufficient, there are a lot of 
disputed borders in the world, also between "friends" e.g. 
http://en.wikipedia.org/wiki/List_of_areas_disputed_by_Canada_and_the_United_States

Or here:
http://en.wikipedia.org/wiki/List_of_territorial_disputes

Cheers,
Martin


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