# Dictionary:Triangulation

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{{#category_index:T|triangulation}}

**1**. Establishing locations by a system of overlapping triangles where the angles are directly measured but only a few of the sides are directly measured. Sometimes called the **method of intersection. First-order triangulation** has an accuracy from one part in 25 000 to one part in 100 000; **second-order**, an accuracy of one part in 10 000; **third-order** one in 5000. **Fourth-order** is ‘‘without any appreciable error’’ considering the application of the survey results. Triangulation with a plane table is shown in Figure P-2 (but a plane table is not an accurate way to triangulate). Compare *traverse* and *trilateration*. **2**. *Tesselation* (q.v.), representation of a surface by triangles.