What is Tacheometric leveling?
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 are the advantages of Tacheometric surveying?
Advantages of Tacheometric Surveying
- It is one of the fastest methods of surveying.
- The accuracy of tacheometric surveying in uneven or difficult terrain is quite satisfactory.
- Does not require any tedious jobs with tapes and chains.
- Cost efficient with relative to time.
What is the principle of Tacheometry?
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 are the characteristics of tacheometer?
The essential characteristics of a tacheometer are: (a) The value of the multiplying constant f/i should be 100. (b) The telescope should be powerful having magnification20 to 30 diameters. (c) The aperture of the objective should be large about 4 cm in diagram in order to have a sufficiently bright image.
What are the methods of Tacheometry?
The various methods of the tacheometric survey may be classified as follows:
- The Stadia System. Fixed Hair Method. Movable Hair Method, or Subtense Method.
- The Tangential System.
- Measurements by means of Special Instruments.
What is difference between tacheometer and Tacheometry?
Difference between theodolite and tacheometer. It is most accurate instrument use for measurement of horizontal and vertical angle. Tacheometer is usually a transit theodolite having a stadia diaphragm. In case of theodolite,the distance is measured on the field by chain or tape.
What is difference between tacheometer and theodolite?
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 are the advantages of an Anallatic lens used in tacheometer?
The function of the anallactic lens is to reduce the stadia constant to zero. Thus, when tacheometer is fitted with anallactic lens, the distance measured between instrument station and staff position (for line of sight perpendicular to the staff intercept) becomes directly proportional to the staff intercept.
What are the Tacheometric methods *?
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 are the Tacheometric constants?
Untitled Document. The stadia interval factor (K) and the stadia constant (C) are known as tacheometric constants. Before using a tacheometer for surveying work, it is reqired to determine these constants. These can be computed from field observation by adopting following procedure.
What are the various uses of Tacheometric surveying?
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.
What is Tacheometric surveying explain the principles of Tacheometric surveying?
Tacheometry or tachemetry or telemetry is a branch of angular surveying in which the horizontal and Vertical distances of points are obtained by optical means as opposed to the ordinary slower process of measurements by tape or chain. • The method is very rapid and convenient.