[Tagging] Key:visibility

[Martin Koppenhoefer]

I think it's ok, maybe there's room for another value beyond area, like 'distance' or 'landmark', or maybe 'region', things that are visible from relatively far away, like from the next village, or from suburbia, like skyscrapers, tv towers,  big towers in general, even smaller towers but atop a mountain, church towers in traditional settings, etc.
Maybe this is already covered with the "landmark" tag?


Cheers,
Martin