Tissot's indicatrix

English

Etymology

Developed by French mathematician Nicolas Auguste Tissot in the 19th century.

Noun

Tissot's indicatrix (plural Tissot's indicatrices)

1. (cartography) A mathematical contrivance used to characterize local distortions due to map projection. It is the geometry that results from projecting a circle of infinitesimal radius from a curved geometric model, such as a globe, onto a map.