parallax difference

The difference between the absolute stereoscopic parallax at the top of the object and at the bottom of the image. It is represented customarily by the symbol dp. The absolute stereoscopic parallax on truly vertical photographs, taken at the same height, is the algebraic difference, parallel to the line of flight, of the distances of the two images of a given object at their base from their respective principal points. Used customarily in the determination of the difference between the elevations of two objects.
In the above illustration, the principal points of the photographs can be accepted as the nadir positions. Both the top and base the objects are clearly visible. The absolute stereoscopic parallax is 10.36 mm in this case, i.e., the sum of the distances of the corresponding images from their respective nadirs. Parallax difference in this case is the difference in the absolute stereoscopic parallax at the top and base are the objects being measured i.e., 10.36–10.32 = 0.04.

Aviation dictionary. 2014.

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  • parallax difference — paralakso skirtumas statusas T sritis Gynyba apibrėžtis Poros nuotraukų dviejų taškų absoliučių stereoskopinių paralaksų skirtumas. Paprastai juo naudojamasi nustatant vietovės objektų aukščių skirtumus. atitikmenys: angl. parallax difference… …   NATO terminų aiškinamasis žodynas

  • différence de parallaxe — paralakso skirtumas statusas T sritis Gynyba apibrėžtis Poros nuotraukų dviejų taškų absoliučių stereoskopinių paralaksų skirtumas. Paprastai juo naudojamasi nustatant vietovės objektų aukščių skirtumus. atitikmenys: angl. parallax difference… …   NATO terminų aiškinamasis žodynas

  • 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 of the cross wires — 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

  • Parallax (disambiguation) — Parallax is the difference in the angular position of two stationary points relative to each other from different viewing positions.* The different viewing positions can arise from an observer s motion, called motion parallax. * The different… …   Wikipedia

  • 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

  • parallax — parallactic /par euh lak tik/, adj. parallactically, adv. /par euh laks /, n. 1. the apparent displacement of an observed object due to a change in the position of the observer. 2. Astron. the apparent angular displacement of a celestial body due …   Universalium

  • 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… …   Aviation dictionary

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