Given good elevation data and feature height, the "visibility" of tall
structures can surely be calculated geometrically. Factor in the width,
the human-eye factors (angular resolution) and maybe atmospheric
distortion and you are there, in an objective sense. The distance will
be dependent on the heading, as the feature may be obscured by other
things from certain directions.
What would this "visibility" tag *actually* be used for? Choosing the
right size of icon on a map? Navigation hints for pilots? Choosing where
to stand for the best view?
//colin
On 2016-12-01 09:59, Martin Koppenhoefer wrote:
> 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
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