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Map projections and coordinate systems > Supported map projections

Orthographic

Release 9.2
Last modified August 3, 2007
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Description

This perspective projection views the globe from an infinite distance. This gives the illusion of a three-dimensional globe. Distortion in size and area near the projection limit appears more realistic than almost any other projection, except the Vertical Near-Side Perspective.

Illustration of the Orthographic projection


Projection method

Planar perspective projection, viewed from infinity. On the polar aspect, meridians are straight lines radiating from the center, and the lines of latitude are projected as concentric circles that become closer toward the edge of the globe. Only one hemisphere can be shown without overlapping.


Point of contact

A single point located anywhere on the globe.


Linear graticules




Properties


Shape



Minimal distortion near the center; maximal distortion near the edge.

Area



The areal scale decreases with distance from the center. Areal scale is zero at the edge of the hemisphere.

Direction



True direction from the central point.

Distance



The radial scale decreases with distance from the center and becomes zero on the edges. The scale perpendicular to the radii, along the parallels of the polar aspect, is accurate.


Limitations

Limited to a view 90° from the central point, a global hemisphere.


Uses and applications

Uses of this projection are aesthetic more than technical. The most commonly used aspect for this purpose is the oblique.


Parameters


Desktop




Workstation





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