## What is tacheometry PDF?

Table of Contents

Tacheometric is also called tachemetry or telemetry. It is the branch of surveying in which both horizontal and vertical distances between stations are determined from instrumental observations. Tacheometric is also called tacheometry. The method is rapid and convenient.

## What is stadia tacheometry?

Tacheometry is a branch of angular surveying in which the horizontal and vertical distances are obtained by optical means as opposed to the ordinary process of chain and tape. This is done with the help of two special type of instruments- transit theodolite and stadia rod.

**What is purpose of tacheometry?**

The primary objective of this tacheometric surveying is to prepare contoured maps or plans requiring both the horizontal as well as vertical control. On surveys of higher accuracy, it provides a check on distances measured with the tape.

### How many hairs are in stadia tacheometry?

Explanation: Stadia diaphragm is used in Tacheometric surveying. The stadia diaphragm has three horizontal hairs i.e., a central horizontal hair and upper and lower stadia hairs.

### What is the principle of stadia method?

The stadia method is based upon the principle of similar triangles. This means that, for a triangle with a given angle, the ratio of opposite side length to adjacent side length (tangent) is constant.

**What is the difference between theodolite and total station?**

A theodolite can be mechanical or electronic. A total station can measure angles and distances electronically and process trigonometrically to give us, at a minimum, position coordinates in space.

#### What is the difference between stadia and tangential method of tacheometry?

In stadia system a telescope is fitted with stadia hair in movable hair method. In tangential system a telescope is not fitted with stadia diaphragm. Two vane or targets are fixed at a known distance apart a normally 3m. Two target are fixed distance apart is probably 3m to 4m.

#### What are various methods of tacheometry?

8. Subtense Method This method is similar to the fixed hair method except that the stadia interval is variable. Suitable arrangement is made to vary the distance between the stadia hair as to set them against the two targets on the staff kept at the point under observation.

**What are the disadvantages of tacheometry?**

Disadvantages of tacheometry:

- In a rough country, both horizontal and vertical measurements are tedious and chaining is inaccurate, hard, and slow.
- This method is usually the fastest and best for figure detection and typographic detailing.

## What is the basic principle of tacheometry?

isosceles triangle

Principle of Tacheometric Surveying The principle of tacheometric surveying is based on the property of an isosceles triangle. It means that; the ratio of the distance of the base from the apex and the length of the base is always constant.

## What is stadia diaphragm in surveying?

The stadia diaphragm essentially consists of one stadia hair above and the other an equal distance below the horizontal cross hair, the stadia hair being mounted in the same ring and in the same vertical plane as the horizontal and vertical cross-hair.

**What is stadia system of tacheometry?**

Stadia System This is the more extensively used system of tacheometry particularly for detailed work, such as those required in engineering surveys. In this system, a tacheometer is first set up at a station, say P, and a staff is held at station Q, as shown in Figure 2.2.

### How far away from a tacheometer should a stadia reading be?

The stadia reading with horizontal sight on a vertical staff held 50m away from a tacheometer were 1.284 and 1.780. the focal length of object glass way 25cm. The distance between the object glass trunnion axis of the tacheometer was 15cm.Calculate the stadia interval (A.M.I.E, 1981 Winter).

### What is the stadia diaphragm of a tachometer?

The stadia diaphragm of the tachometer has two hairs, one is above, and the other is below the horizontal crosshair at equal distance. The stadia hairs are kept in the same vertical plane as the horizontal and vertical crosshairs.

**What is tacheometry?**

Tacheometric is also called tachemetry or telemetry. It is the branch of surveying in which both horizontal and vertical distances between stations are determined from instrumental observations. Tacheometric is also called tacheometry.