principal vertical
On an oblique photograph, a line perpendicular to the true horizon and passing through the principal point.

Military dictionary. 2000.

Look at other dictionaries:

  • principal vertical — pagrindinė vertikalė statusas T sritis Gynyba apibrėžtis Linija įžambiojoje nuotraukoje, einanti per pagrindinį tašką ir statmena horizonto linijai. atitikmenys: angl. principal vertical pranc. ligne de plus grande pente …   NATO terminų aiškinamasis žodynas

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  • principal plane — A vertical plane that contains the principal point of an oblique photograph, the perspective center of the lens, and the ground nadir. It is the vertical plane containing the optical axis …   Aviation dictionary

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  • principal parallel — i. On an oblique photograph, a line parallel to the true horizon and passing through the principal point. See photograph parallel. ii. On a vertical photograph, a parallel passing through a photo nadir. Also known as a photo nadir parallel …   Aviation dictionary

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