What is the purpose of Tacheometry?

Publish date: 2022-09-10
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.

Similarly, what are the uses of Tacheometry?

Uses of tacheometry It's usefulness is due to fact that it does not need chaining or horizontal measurement. It is used for the preparation of contour map in case when both horizontal and vertical distances needed. It is very useful for triangulation surveying also.

Subsequently, question is, what is the basic principle of Tacheometry? INSTRUMENTS USED: An ordinary transit theodolite fitted with a stadia diaphragm is generally used for tacheometric survey. Principle of tacheometry: The principle of tacheometer is based on property of isosceles triangles, where the ratio of distance of the base from apex and length of the base is always constant.

One may also ask, what are the advantages of Tacheometry?

The advantages of tacheometric surveying over the direct method of measuring horizontal distances and difference in elevations are: Speed of surveying is very high. Accuracy of surveying is quite satisfactory in normal conditions and even superior in difficult terrain. Cost of surveying is less.

What is meant by Tacheometer?

TACHEOMETER. by Wilfred Airy. Tacheometry, from the Greek "quick measure", is a system of rapid surveying, by which the positions, both horizontal and vertical, of points on the earth's surface relatively to one another are determined without using a chain or tape or a separate leveling instrument.

What are the methods of Tacheometry?

Different Methods of Tacheometric Measurements

How does a total station work?

A total station consists of a theodolite with a built-in distance meter, enabling it to simultaneously measure angles and distances and determine the positions and heights of points. The coded scales of the horizontal and vertical circles are scanned electronically, and the angles and distances are displayed digitally.

What is the principle of theodolite?

The principles of the theodolite are that a beam of light travels in a straight line, and that when you know the length of one side of a triangle and the angles of the corners as measured by reflecting beams of light then you can precisely map features on the ground both horizontally and vertically.

What is stadia method?

The Stadia. The Stadia is a method of measuring distances rapidly with a telescope (usually on an engineer's transit or an alidade) and a graduated rod. If the line of sight is inclined, the vertical angle is also measured and can be used to reduce the results to horizontal and vertical distances.

What is a theodolite used for?

A theodolite is a precision instrument used for measuring angles both horizontally and vertically. Theodolites can rotate along their horizontal axis as well as their vertical axis. Theodolites have a lot in common with transits. A transit is a surveying instrument that also takes accurate angular measurements.

What is stadia intercept?

A surveying technique or method using a stadia rod in which distances from an instrument to the rod are measured by observing through a telescope the intercept on the rod subtending a small known angle at the point of observation, the distance to the rod being proportional to the rod intercept.

What does stadia mean in the Bible?

Definition for stadia (3 of 3) an ancient Greek and Roman unit of length, the Athenian unit being equal to about 607 feet (185 meters).

What is the difference between theodolite and Tacheometer?

The theodolite when works as a level instrument it is called a Tacheometer. The difference is level have no movement in vertical axis. Theodolite can move in vertical axis. If we want to measure the reduced level of a hill, it is very taught to do this by using level instrument.

What is tangential method?

The tangential method of tacheometry is being used when stadia hairs are not present in the diaphragm of the instrument or when the staff is too far to read. In this method, the staff sighted is fitted with two big targets (or vanes) spaced at a fixed vertical distances.

What is reference point in surveying?

Provide a note on the Project Control sheet that identifies horizontal and vertical datum that the survey is based on. 12.3. Reference Points. Reference points are prominent, easily located points in the terrain used to define a location of another point that is located on the baseline of survey.

What is the application of surveying in civil engineering?

Surveying is the scientific technique to determine the position of points and angles & distances between them. The process of surveying is used to fulfill various purposes. It is necessary for making map, planning a project etc. To accomplish all civil engineering works or projects successfully, surveying is used.

What are the instruments used in Tacheometric surveying?

The instruments employed in tachometry are the engineer's transit and the leveling rod or stadia rod, the theodolite and the subtense bar, the self-reducing theodolite and the leveling rod, the distance wedge and the horizontal distance rod, and the reduction tacheometer and the horizontal distance rod.

What is stadia rod?

: a graduated rod used with an instrument having stadia hairs to measure the distance from the observation point to the place where the rod is positioned by observation of the length of rod subtended by the distance between the stadia hairs when these are fixed or of the space between the stadia hairs when they are

What is direct reading Tacheometer?

Abstract. A direct reading tacheometer devised by Prof. H. H. Jeffcott, Sec. I.C.E., is described, in which two movable, cam-controlled, stadia points enable the horizontal distance and the vertical height to be read off from the staff intercepts directly without calculation.

What is stadia interval?

Stadia interval factor is the ratio of the focal distance to the distance between the stadia hairs, which for a particular instrument is a constant as long as conditions remain unchanged.

What Tacheometric constant?

The Stadia Interval Factor (K) and the Stadia Constant (C) are known as tacheometric constants. Before using a Tacheometer for surveying work, it is required to determine these constants. These constants are also termed as - Stadia Interval Factor (K) aka Multiplicative Constant. (

What is total station instrument?

A total station is an electronic/optical instrument used in modern surveying and building construction that uses electronic transit theodolite in conjunction with electronic distance meter (EDM). It is also integrated with microprocessor, electronic data collector and storage system.

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