[Tagging] Feature Proposal – RFC – natural=peninsula (Was: Feature Proposal – RFC – place=peninsula)

Christoph Hormann osm at imagico.de
Thu Jan 10 21:29:28 UTC 2019

On Thursday 10 January 2019, Markus wrote:
> I've replaced *nearly surrounded by water* with *surrounded by water
> on the majority of its border*, but i'm unsure whether this is
> clearer. If you or someone has a better idea, please tell me.

That is a fairly toothless criterion because you will very often be able 
to achive this simply by mapping the coastline in more detail (making 
it longer).

A more robust and tighter criterion would be that the length of the 
non-water part of the boundary needs to be shorter than the square root 
of its area.  Geometrically this limit is equivalent to a square shaped 
peninsula connected at one of its sides.  Ultimately any such criterion 
is an arbitrary limit of course.

Practical examples of things frequently called peninsulas that exceed 
this limit are the Balkan Peninsula:


and the Indian subcontinent:


But i think if you really want natural=peninsula to be meaningful 
geometrically you need to go at least to this limit.

Christoph Hormann

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