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.

Look at other dictionaries:

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  • Parallax — Par al*lax, n. [Gr. ? alternation, the mutual inclination of two lines forming an angle, fr. ? to change a little, go aside, deviate; para beside, beyond + ? to change: cf. F. parallaxe. Cf. {Parallel}.] 1. The apparent displacement, or… …   The Collaborative International Dictionary of English

  • 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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  • parallax — (n.) 1570s, from M.Fr. parallaxe (mid 16c.), from Gk. parallaxis change, alteration, inclination of two lines meeting at an angle, from parallassein to alter, make things alternate, from para (see PARA (Cf. para )) + allassein to change, from… …   Etymology dictionary

  • parallax — ► NOUN 1) the apparent difference in the position of an object when viewed from different positions, e.g. through the viewfinder and the lens of a camera. 2) Astronomy the angular difference in the apparent positions of a star observed from… …   English terms dictionary

  • Parallax — For other uses, see Parallax (disambiguation). A simplified illustration of the parallax of an object against a distant background due to a perspective shift. When viewed from Viewpoint A , the object appears to be in front of the blue square.… …   Wikipedia

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