Triangulation

Liu Hui (c. 263), How to measure the height of a sea island. Illustration from an edition of 1726

Gemma Frisius's 1533 proposal to use triangulation for mapmaking

In trigonometry and geometry, triangulation is the process of determining the location of a point by measuring angles to it from known points at either end of a fixed baseline, rather than measuring distances to the point directly (trilateration). The point can then be fixed as the third point of a triangle with one known side and two known angles.

单词	Triangulation network
释义	Triangulation network 英语百科 Triangulation In trigonometry and geometry, triangulation is the process of determining the location of a point by measuring angles to it from known points at either end of a fixed baseline, rather than measuring distances to the point directly (trilateration). The point can then be fixed as the third point of a triangle with one known side and two known angles.
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Triangulation network

Triangulation