A simple geometric map projection in which the surface of the Earth is transformed to one of three developable surfaces; the plane, cylinder, or cone. Most map projections can be described and categorized according to from which geometric surface they are derived. The point of perspective of most projections is at the centre of the Earth. However, with the planar family of map projections the point of perspective may also be a location opposite to the point of tangency or from an external point, as if the Earth were viewed from outer space.
(n.) The process of projecting an image from the 3-D view volume to the 2-D graphics display with projector lines that converge at the eye point. Objects appear to diminish if they are further from the eye point.
Projection produced by projecting straight lines radiating from a selected point (or from infinity) through points on the surface of a sphere or ellipsoid and then onto a tangent or secant plane. Other perspective maps are projected onto a tangent or secant cylinder or cone by using straight lines passing through a single axis of the sphere or ellipsod. Also called geometric projection
(n) A projection technique in which some or all of the projectors converge at predefined points. This pictorial projection technique is used to replicate closely how humans perceive objects in the real world.
A perspective projection is a single point of view and is typical of an aerial photograph; areas of terrain at higher elevations lie closer to the camera at the time of exposure and therefore appear larger than corresponding areas lying at lower elevations. The tops of objects are always displaced from their bases. This distortion causes any object standing above the terrain (such as a tree or tower) to appear in the photograph as "leaning" directly away from the principal point of the photograph.
Perspective projection is a type of drawing, or rendering, that graphically approximates on a planar (two-dimensional) surface (e.g. paper or painting canvas) the images of three-dimensional objects so as to approximate actual visual perception. It is sometimes also called perspective view or perspective drawing or simply perspective. A perspective projection drawing must be made according to an established geometric protocol.