What Is Tacheometric Alidade?

Tacheometry is a method that unifies horizontal and vertical surveying. ... A numerical angle is obtained by readings on the horizontal circle of the tacheometer, a graphical angle is obtained by pointing with a telescopic alidade on a plane table.

What is meant by Tacheometric surveying?

Tacheometry (/ˌtækiˈɒmɪtri/; from Greek for "quick measure") is a system of rapid surveying, by which the horizontal and vertical positions of points on the earth's surface relative to one another are determined without using a chain or tape, or a separate levelling instrument.

What is the purpose of Tacheometric survey?

Tachometry is used for preparation of topographic map where both horizontal and vertical distances are required to be measured; survey work in difficult terrain where direct methods of measurements are inconvenient; reconnaissance survey for highways and railways etc; Establishment of secondary control points.