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  2. Tissot's indicatrix - Wikipedia

    en.wikipedia.org/wiki/Tissot's_indicatrix

    The Behrmann projection with Tissot's indicatrices The Mercator projection with Tissot's indicatrices. In cartography, a Tissot's indicatrix (Tissot indicatrix, Tissot's ellipse, Tissot ellipse, ellipse of distortion) (plural: "Tissot's indicatrices") is a mathematical contrivance presented by French mathematician Nicolas Auguste Tissot in 1859 and 1871 in order to characterize local ...

  3. Nicolas Auguste Tissot - Wikipedia

    en.wikipedia.org/wiki/Nicolas_Auguste_Tissot

    In the book, Tissot argued for his method, reportedly demonstrating that "whatever the system of transformation, there is at each point on the spherical surface at least one pair of orthogonal directions which will also be orthogonal on the projection." [5] Tissot employed a graphical device he called the ellipse indicatrice or distortion ...

  4. 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 ...

  5. Mercator projection - Wikipedia

    en.wikipedia.org/wiki/Mercator_projection

    Tissot's indicatrices on the Mercator projection. The classic way of showing the distortion inherent in a projection is to use Tissot's indicatrix. Nicolas Tissot noted that the scale factors at a point on a map projection, specified by the numbers h and k, define an ellipse at that point. For cylindrical projections, the axes of the ellipse ...

  6. File:Tissot indicatrix world map Gall-Peters equal-area proj ...

    en.wikipedia.org/wiki/File:Tissot_indicatrix...

    Attribution and Share-Alike required; Any use of this map can be made as long as you credit me (Eric Gaba – Wikimedia Commons user: Sting) as the author and distribute the copies and derivative works under the same license(s) that the one(s) stated below.

  7. 7 signs you might have ADHD and what steps to take - AOL

    www.aol.com/7-signs-might-adhd-steps-093036184.html

    With 15.5 million U.S. adults currently diagnosed with ADHD, there is a growing focus on warning signs of the disorder. Mental health experts share the most common signs and symptoms.

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  9. Orthographic map projection - Wikipedia

    en.wikipedia.org/wiki/Orthographic_map_projection

    The formulas for the spherical orthographic projection are derived using trigonometry.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).