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  2. Stereographic projection - Wikipedia

    en.wikipedia.org/wiki/Stereographic_projection

    Stereographic projection of the unit sphere from the north pole onto the plane z = 0, shown here in cross section. The unit sphere S 2 in three-dimensional space R 3 is the set of points (x, y, z) such that x 2 + y 2 + z 2 = 1. Let N = (0, 0, 1) be the "north pole", and let M be the rest of the sphere.

  3. Gnomonic projection - Wikipedia

    en.wikipedia.org/wiki/Gnomonic_projection

    Gnomonic projection of a portion of the north hemisphere centered on the geographic North Pole The gnomonic projection with Tissot's indicatrix of deformation. A gnomonic projection, also known as a central projection or rectilinear projection, is a perspective projection of a sphere, with center of projection at the sphere's center, onto any plane not passing through the center, most commonly ...

  4. 3D projection - Wikipedia

    en.wikipedia.org/wiki/3D_projection

    For example, lines traced from the eye point at 45° to the picture plane intersect the latter along a circle whose radius is the distance of the eye point from the plane, thus tracing that circle aids the construction of all the vanishing points of 45° lines; in particular, the intersection of that circle with the horizon line consists of two ...

  5. Peirce quincuncial projection - Wikipedia

    en.wikipedia.org/wiki/Peirce_quincuncial_projection

    The maturation of complex analysis led to general techniques for conformal mapping, where points of a flat surface are handled as numbers on the complex plane.While working at the United States Coast and Geodetic Survey, the American philosopher Charles Sanders Peirce published his projection in 1879, [2] having been inspired by H. A. Schwarz's 1869 conformal transformation of a circle onto a ...

  6. Spherical circle - Wikipedia

    en.wikipedia.org/wiki/Spherical_circle

    A circle with non-zero geodesic curvature is called a small circle, and is analogous to a circle in the plane. A small circle separates the sphere into two spherical disks or spherical caps, each with the circle as its boundary. For any triple of distinct non-antipodal points a unique small circle passes through all three.

  7. Orthographic map projection - Wikipedia

    en.wikipedia.org/wiki/Orthographic_map_projection

    They are written in terms of longitude (λ) and latitude (φ) on the sphere. Define the radius of the sphere R and the center point (and origin) of the projection (λ 0, φ 0). The equations for the orthographic projection onto the (x, y) tangent plane reduce to the following: [1]

  8. Projective line - Wikipedia

    en.wikipedia.org/wiki/Projective_line

    In mathematics, a projective line is, roughly speaking, the extension of a usual line by a point called a point at infinity.The statement and the proof of many theorems of geometry are simplified by the resultant elimination of special cases; for example, two distinct projective lines in a projective plane meet in exactly one point (there is no "parallel" case).

  9. List of map projections - Wikipedia

    en.wikipedia.org/wiki/List_of_map_projections

    The straight-line distance between the central point on the map to any other point is the same as the straight-line 3D distance through the globe between the two points. c. 150 BC: Stereographic: Azimuthal Conformal Hipparchos* Map is infinite in extent with outer hemisphere inflating severely, so it is often used as two hemispheres.

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