Tissot's indicatrix, which describes and visualizes the distortion of a map
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Tangent indicatrix, an object in differential geometry related to a closed space curve
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Dupin indicatrix, a conic section which describes the local shape of a surface
Tissot's indicatrix | Tangent indicatrix | Dupin indicatrix |
Tissot’s indicatrix (Tissot indicatrix, Tissot’s ellipse, Tissot ellipse, ellipse of distortion) is a mathematical contrivance presented by French mathematician Nicolas Auguste Tissot in 1859 and 1871 in order to characterize distortions due to map projection.