# Orthographic Projection

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## orthographic projection

[¦ȯr·thə¦graf·ik prə′jek·shən] (crystallography)

A projection for displaying the poles of a crystal in which the poles are projected from a reference sphere onto an equatorial plane by dropping perpendiculars from the poles to the plane.

(graphic arts)

(mapping)

A perspective azimuthal projection of one hemisphere produced by straight parallel lines from any point desired from an infinite distance; it is true to scale at the center only.

(mathematics)

## orthographic projection

A method of projection in which a three-dimensional object is represented by projecting lines perpendicular to a picture plane. See also: Projection drawing

## Orthographic Projection

a perspective cartographic projection. Because of considerable distortions, it is not used in cartography.

## orthographic projection

Projection in which exact views of an object are constructed by extending perpendiculars from points on the object to the plane of projection.