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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.

  3. 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 ...

  4. Map projection - Wikipedia

    en.wikipedia.org/wiki/Map_projection

    Can display nearly the entire sphere's surface on a finite circle. The sphere's full surface requires an infinite map. Other azimuthal projections are not true perspective projections: Azimuthal equidistant: r(d) = cd; it is used by amateur radio operators to know the direction to point their antennas toward a point and see the distance to it.

  5. 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.

  6. Lambert azimuthal equal-area projection - Wikipedia

    en.wikipedia.org/wiki/Lambert_azimuthal_equal...

    It sends the point (0, 0, −1) to (0, 0), the equator z = 0 to the circle of radius √ 2 centered at (0, 0), and the lower hemisphere z < 0 to the open disk contained in that circle. The projection is a diffeomorphism (a bijection that is infinitely differentiable in both directions) between the sphere (minus (0, 0, 1)) and the open disk of ...

  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. Gauss map - Wikipedia

    en.wikipedia.org/wiki/Gauss_Map

    The Gauss map provides a mapping from every point on a curve or a surface to a corresponding point on a unit sphere. In this example, the curvature of a 2D-surface is mapped onto a 1D unit circle. In differential geometry , the Gauss map of a surface is a function that maps each point in the surface to a unit vector that is orthogonal to the ...

  9. Mapping torus - Wikipedia

    en.wikipedia.org/wiki/Mapping_torus

    If X is a manifold, M f will be a manifold of dimension one higher, and it is said to "fiber over the circle". As a simple example, let X {\displaystyle X} be the circle, and f {\displaystyle f} be the inversion e i x ↦ e − i x {\displaystyle e^{ix}\mapsto e^{-ix}} , then the mapping torus is the Klein bottle.

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