Determination of distances by visible details of objects. Travel Tips

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Determination of distances by visible details of objects. Travel Tips

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Observing a person from different distances, it is easy to notice that as he moves away, individual details of clothing, faces, figures become indistinguishable for the observer, and then disappear. The visibility of details varies depending on the time of day, weather conditions, background brightness and the subject itself. So, for example, at dusk, on a rainy day in the shade of a forest, all objects seem further away and, conversely, on a clear sunny day in an open area - closer.

To recognize objects with normal vision and good visibility conditions, one can be guided by table of object visibility distancesbased on long-term observations.

Item name	Distance
(in kilometers)
Big towers, churches, elevators	16-21
Settlements	11
large buildings	9
factory pipes	6
detached houses	5
Windows in houses without sashes	4
Pipes on roofs
Individual trees, poles, people	2
Cars, carts on the ground	1,5-1
(in meters)
aircraft Chassis	800
Horses, cattle - legs differ	700
Bindings in windows	500
human head	400
Colors and pieces of clothing
Roof tiles, roof boards, tree leaves	210
Buttons, clothing details	160
Faces of people	115
Facial expression	100
Human eyes - dots	60
Whites of the eyes	20

Author: A.E. Menchukov

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