What does stereographic mean?
Stereographic is an adjective describing a projection that places a three-dimensional spherical surface onto a flat plane. In a stereographic projection, points on the sphere are projected from a point of tangency onto a tangent plane, with lines extending infinitely away from that point. The method is conformal, meaning that it preserves local angles and the shapes of sufficiently small regions. It is especially useful in cartography and in the mathematical study of hyperbolic geometry, where the projection gives a model of the hyperbolic plane on an ordinary flat surface. The term is more specific than simply three-dimensional or panoramic: it identifies a particular mathematical technique for representing a curved surface. Although often encountered in technical discussions of maps, geometry, and complex analysis, stereographic is best reserved for contexts in which the projection itself is relevant.
adjectiveRelating to or involving stereographic projection, a method of representing a three-dimensional spherical surface on a flat plane using a tangent point and lines drawn from it.
- Of or relating to stereographic projection, a conformal projection of a sphere onto a plane from a point of tangency.
- Characterized by the representation of three-dimensional forms on a flat surface, especially through stereographic projection.
"The map uses a stereographic projection to display the globe without distorting the local shapes of countries."
"Cartographers chose a stereographic projection because it preserves the shapes of small regions near the point of tangency."
"The stereographic representation provides a useful model for studying hyperbolic geometry."
Stereographic projection can turn an entire globe into a flat map while preserving local shapes, making the curved Earth surprisingly map-like.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of stereographic
The word combines the combining form stereo-, derived from Greek stereos, meaning solid, with graphic, which comes from Greek graphikos, meaning pertaining to drawing or writing. The specific mathematical sense developed from the term stereographic projection, a name used for projecting a sphere onto a plane from a point of tangency. Related English words include stereograph and stereoscope, while paragraph shares the graphic element based on Greek graphein, to write.
Related word forms
How stereographic is actually used
This is primarily a mathematical and cartographic term. In general usage, it is less common than the related term stereoscopic and should not be used merely to mean three-dimensional.
Easily confused with stereographic
Stereographic describes a mathematical projection of a spherical surface onto a plane, whereas stereoscopic usually describes images or techniques that create an illusion of three-dimensional depth.