Estimates Of Visibility From High Altitude Aircraft PDF Download
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Author | : John D. Coakley |
Publisher | : |
Total Pages | : 60 |
Release | : 1948 |
Genre | : |
ISBN | : |
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The distance at which an object becomes visible depends upon such factors as brightness contrast, target size, brightness level, and atmospheric attenuation. Numerical values are selected to represent the influence of these variables under the conditions of high altitude flight. Visibility is examined under the following conditions: (a) Altitude of observer--sea level, 50,000, 100,000, and 200,000 feet. (b) Altitude of target--from sea level to approximately 300,000 feet (60 miles). (c) Background brightness conditions--from 1 to 32 footlamberts. (d) Contrast ratio between target and background--for values of 1, 5, 10, and 100. The computation of visibility is based on visual acuity data corrected for the effect of atmospheric attenuation at various altitudes. A round object with a diameter of 10 feet may be used as a representative target. (Author).
Author | : Psychological Corporation |
Publisher | : |
Total Pages | : 59 |
Release | : 1948 |
Genre | : |
ISBN | : |
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Author | : Defense Documentation Center (U.S.) |
Publisher | : |
Total Pages | : 784 |
Release | : 1967 |
Genre | : Science |
ISBN | : |
Download Technical Abstract Bulletin Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 558 |
Release | : 1966 |
Genre | : Human engineering |
ISBN | : |
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Author | : |
Publisher | : |
Total Pages | : 892 |
Release | : 1967 |
Genre | : Government publications |
ISBN | : |
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Author | : |
Publisher | : |
Total Pages | : 14 |
Release | : 1954 |
Genre | : |
ISBN | : |
Download Comments on Air to Air Visibility at High Altitude Book in PDF, ePub and Kindle
Aviators flying at high altitude report difficulty in sighting other aircraft. The factors causing this poor air-to air visibility are discussed, particularly the phenomenon of 'empty field' myopia. It is concluded that the correction of the myopia may moderately improve air-to-air vision. An experiment for quantitatively determining the improvement is proposed, and some practical methods of correcting the empty field myopia are suggested.
Author | : |
Publisher | : |
Total Pages | : 228 |
Release | : 1969 |
Genre | : Science |
ISBN | : |
Download U.S. Government Research & Development Reports Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 1338 |
Release | : 1969-04 |
Genre | : Science |
ISBN | : |
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Author | : |
Publisher | : |
Total Pages | : 608 |
Release | : 1967 |
Genre | : Science |
ISBN | : |
Download Government-wide Index to Federal Research & Development Reports Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 872 |
Release | : 1967 |
Genre | : Government reports announcements & index |
ISBN | : |
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