What is a tachometry?
What is it’s used in civil engineering projects?
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Tacheometry is the branch of angular surveying in which the horizontal and the vertical distance of points are obtained by optical means as opposed to the ordinary slower process of measurement by tape or chain.
Tacheometry is also called as telemetry or tachometry
The instrument used: ordinary transit theodolite fitted with stadia diaphragm.
Uses in civil engineering:
Tacheometric is a branch of surveying in which horizontal and vertical distances are
determined by taking angular observation with an instrument known as a tachometer.
Tacheometric surveying is adopted in rough in rough and difficult terrain where direct levelling
and chaining are either not possible or very tedious.
Tacheometric survey also can be used for Railways, Roadways, and reservoirs etc.
Tacheometric surveying is very rapid, and a reasonable contour map can be prepared for
investigation works within a short time on the basis of such survey.
An ordinary transits theodolite fitted with a stadia diaphragm is generally used for tacheometric
Uses of Tachometry in civil engineering
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.
Tacheometry is a system of rapid surveying, by which the horizontal and vertical positions of the points on the earths surface relative to one another are determined without using a chain or tape, or a seperate levelling instrument. It is a type of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target.
The principle of tacheometer is based on the property of isosceles triangles, where the ratio of distance of the base from apex and length of the base is always constant.