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# 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

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• 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