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What do you mean by tacheometry?

What do you mean by tacheometry?

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 principle of fixed hair method of tacheometry?

Fixed Hair Method In this method, the angle at the instrument at A subtended by a known short distance along a staff kept at B is made with the help of a stadia diaphragm having stadia wires at fixed or constant distance apart. The readings are on the staff corresponding to all the three wires taken.

What is the method of tacheometry survey?

Tacheometric surveying is a method of angular surveying in which the horizontal distance from the instrument to the staff stations are determined from instrumental observations only. Thus the chaining operations are eliminated.

What is the aim 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.

What do you mean by tacheometry give principles of tacheometry?

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.

Where is tacheometry used?

Definition of Tacheometry: Thus it is best suited when obstacles such as steep and broken ground, deep ravines, stretches of water or swamps are met with Tacheometry is mainly used while preparing contour plans and traversing and is also suitable for hydrographic surveys, location surveys of roads, railways, etc.

What do you mean by tacheometry give principle of tacheometry?

Which instrument is used for tacheometry survey?

The instrument for tacheometry is the tacheometer. By means of it the horizontal distance is determined by optical or electronic (electro-optical) distance measurement, and the horizontal angle is determined numerically or graphically.

Where is Tacheometry used?

What are the advantages and disadvantages of tacheometry?

The method is more rapid, although less precise than chaining. They are more effective where rivers, valleys, broken boundaries, hard slopes, and undulations are difficult to chase. For the preparation of contour maps, it is essential to measure horizontal and vertical distances. It is used for survey roads, railways.

How is the principle of tacheometric surveying used?

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. A tacheometer is a type of theodolite that is used in tacheometric surveying.

How is the tangential system used in tacheometry?

The Tangential System of Tacheometry: This method is used when the telescope is not fitted with a stadia diagram. In this method, the telescope is directed towards the staff to which the horizontal and vertical distances are to be measured and two vertical angles to two vanes or targets on the staff at a known distance (S) apart are taken.

Which is the best description of a tacheometer?

Tacheometer. A tachymeter or tacheometer is a type of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target. The principles of action are similar to those of rangefinders .

When to use multiplicative constants in tacheometry?

If the stadia rod is not at the same elevation as the instrument, the value must be corrected for the angle of elevation between the instrument and the rod. The formula most widely used for finding the distances is: are multiplicative and additive constants. Generally, the instrument is made so that exactly, to simplify calculations.