parallax

parallax
i. As it relates to photo interpretation, the apparent displacement of the position of a body with respect to a reference point or system caused by a shift in the point of observation. In the illustration, A will see the black post to the right of the white post; the camera at B will see the black post to the left of the white post.
The black and white posts are in one line as viewed by an aircraft in the center. The black post appears to the left of the white post when the observer sees it from position A. The observer sees the white post to the left of the black post when the same is viewed from the position B. This is due to parallax.
ii. The difference in the direction of a celestial object as seen by an observer from two widely separated points. The measurement of parallax is used directly to find the distance of the body from the earth and from the sun.
Parallax.
iii. The phenomenon in radar imagery when a tall object is imaged and the top of the object is nearer the aircraft. In this case, the slant range to the top of the object is less than that to the base. The object appears to lie toward the aircraft flight path. This is known as radar parallax.

Aviation dictionary. 2014.

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  • parallax — [par′ə laks΄] n. [Fr parallaxe < Gr parallaxis < parallassein, to vary, decline, wander < para ,PARA 1 + allassein, to change < allos, other: see ELSE] 1. the apparent change in the position of an object resulting from the change in… …   English World dictionary

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