Question

What is tacheometry? What are different systems of tacheometric measurements?

Answer 1

a method of angular surveying in which the horizontal distance from the instrument to the staff stations are determined from instrumental observations only.

Here are two examples

Stadia System of Tacheometry;

In the stadia system the horizontal distance to the staff Station from the instrument station and the elevation of the staff station concerning the line of sight of the instrument is obtained with only one observation from the instrument Station.

Tangential System of Tacheometric Surveyinh

In this system of tacheometric surveying, two observations will be necessary from the instrument station to the staff station to determine the horizontal distance and the difference in the elevation between the line of collimation and the staff station.

The only advantage of this method is that this survey can be conducted with ordinary transit theodolite.