Tissot's indicatrix

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Notion

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Science and technology

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What Wikipedia says

In cartography, a Tissot's indicatrix (English: , French: [tiso]; plural: "Tissot's indicatrices"), or Tissot indicatrix, Tissot's ellipse, Tissot ellipse, or ellipse of distortion, is a mathematical contrivance presented by French mathematician Nicolas Auguste Tissot in 1859 and 1871 to characterize local distortions due to map projection.

Excerpt from the Wikipedia article “Tissot's indicatrix”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Kurubu, CC BY-SA 4.0, via Wikimedia Commons.