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Tacheometry is generally preferred to if ground is
Flat
Undulating
Mountainous
Deserts
Undulating
Tacheometry is a rapid surveying method used to determine the horizontal and vertical positions of points without the need for chain or tape measurements. It is specifically preferred in undulating or rough terrain where direct linear measurement is difficult, time-consuming, or physically impossible.
Tacheometry is a rapid surveying method used to determine the horizontal and vertical positions of points without the need for chain or tape measurements. It is specifically preferred in undulating or rough terrain where direct linear measurement is difficult, time-consuming, or physically impossible.
D=KS+C тАФ Distance calculation formula where K is multiplying constant and S is staff intercept
V=Dsin╬╕ тАФ Vertical elevation difference formula
The principle relies on the property of the isosceles triangle formed by the stadia hairs of the instrument and the staff. By observing the distance between the two stadia hairs on a graduated leveling staff, the horizontal distance and vertical elevation difference are calculated using basic trigonometry. The formula D=KS+C governs the distance calculation, where K is the multiplying constant and C is the additive constant.
Used when direct chaining is obstructed by obstacles like rivers, ravines, or hilly slopes.
Efficient for preliminary surveys in mountainous and undulating regions.
Eliminates the error associated with tape measurements on uneven surfaces.
Rapid data collection in rough terrain.
Requires only one instrument operator and one staff person.
Can overcome geographical obstacles without physical traversal.
Lower precision compared to high-accuracy leveling.
Visibility between stations is mandatory.
Errors in staff reading propagate significantly over long distances.
Topographic mapping of hilly terrain.
Surveying for road and railway alignments in undulating land.
Hydrographic surveys for river crossings.
Tacheometry is effectively a branch of angular surveying.
Option A is incorrect because flat ground is better suited for conventional chain or electronic distance measurement (EDM) for higher accuracy.
The stadia hair method is the most common form of tacheometry.
B is correct тАФ Tacheometry is the preferred surveying method for undulating or mountainous ground where chain or tape measurement is impractical.
Always remember that in exams, 'Undulating' is the specific keyword associated with the choice of Tacheometry over traditional chain surveying.
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