Visibility


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visibility

[‚viz·ə′bil·əd·ē]
(meteorology)
In weather observing practice, the greatest distance in a given direction at which it is just possible to see and identify with the unaided eye, in the daytime, a prominent dark object against the sky at the horizon and, at nighttime, a known, preferably unfocused, moderately intense light source.

Visibility

 

the possibility of visual perception of objects that are distant from the observer. Visibility is characterized by degrees—that is, distinguishability (how clearly the object can be seen)—and by range—that is, the distance at which the object under observation is no longer discernible to the naked eye. Visibility is classified according to the observation medium as atmospheric visibility (in the air), underwater visibility (in water), and visibility in solid bodies (for example, in glass). Generally, an object’s distinguishability depends on its angular dimensions, the brightness level, the contrast between the background and the object, the time of observation, the degree of pollution of the medium, and other technical and physiological factors. The determination of an object’s visibility is one of the principal tasks of human engineering that is related to the development of automatic control systems, which include reflection devices for the visual and rapid transmission of information to the human operator.

REFERENCES

Inzhenerno-psikhologicheskie trebovaniia k sistemam upravleniia. Moscow, 1961.
Woodson, W., and D. Conover. Spravochnik po inzhenernoi psikhologii dlia inzhenerov i khudozhnikov-konstruktorov. Moscow, 1968. (Translated from English.)

V. P. ISAEV


Visibility

 

from an automobile, the extent to which an unobstructed view is provided of the area surrounding an automobile. Upward vision from the driver’s seat is determined by the limit of visibility for a point located 5 m above the road. Blowing warm air over the front windshield is an effective means of improving visibility for the driver in winter.

Rear visibility is determined by the size and location of the rear windshield; it can also be improved by the installation of additional rear-view mirrors and by heating the rear windshield in winter. Visibility is an important consideration in the design of vehicles and of machines used for hoisting and transportation.

M. B. AFANAS’EV

visibility

1. The quality or state of being perceivable by the eye.
2. The distance at which an object out-of-doors can be just perceived by the eye.
3. The size of a standard test object, observed under standardized viewing conditions, which has the same threshold as the given object.

visibility

The ability as determined by atmospheric conditions and expressed in units of distance, to see and identify prominent unlighted objects by day and prominent lighted objects by night (ICAO). The lighted objects are of specified candlepower. While measuring visibility, the nearest discernible object or light is taken into account.
References in periodicals archive ?
Collectively, visibility of processes, resources, and requirements comprise the information that logisticians need to accomplish their mission; without each of these elements, they cannot prioritize effort.
Smaller institutions may benefit from volume package delivery arrangements and Web-based visibility tools.
The support of the Worldwide Port System program management folks allowed us to gain proof of concept to use Radio Frequency Identification tag data as the source for Worldwide Port System in-transit visibility updates in lieu of printing and scanning military shipping labels," said Harvey.
Whereas, in Native Son, Bigger's consciousness of his "place" is a result of his positioning within visibility, in "Fire and Cloud" the mob tries to subjugate the "uppity" black man to his "place" by "branding" him by whipping.
For more information on running Visibility Applications on Amazon EC2 contact visibility at www.
With the Worldwide Port System you're working primarily with fort to port in-transit visibility," said Blair Perkins, an engineer with Unisys Radio Frequency Identification.
Financial visibility is critical, not only to the inner workings of a company: It is also important to a company's stakeholders and the marketplace in which it operates.
For if you're reinscribing the methodological displacement of the African-American woman on one hand, and remarketing in modernist fashion the logics of presence and visibility conditioning and contributing to her historical expulsion on the other, it seems to me that you're not really taking a hell of a risk by centering your investigative study on black women after all.
the leader in debug and visibility enhancement solutions for complex chip designs, today announced that its Siloti[TM] Visibility Enhancement (VE) software has been selected from a field of hundreds as a finalist for the 2006 EDN Innovator/Innovation Awards.
Jack Saint, the President and COO at Visibility Corporation, noted; "The ERP Connection is a great way for Visibility to stay connected with our customers and prospects.
By centralizing business modernization programs that create department-wide capabilities, the BTA is, in the long term, expected to result in increased supply chain efficiencies, full visibility into business processes, more effective human resource management, timely and accurate reporting, and measurable transformation results.
Demand visibility tells CFOs where the future of the company lies, yet they typically lack the ability to access the best available data on demand.