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The two targets are at a distance s apart, and each at s/2 from centre, i.e. vertical axis. The horizontal angle α is measured carefully by means of a odolite. Then what is value of D in subtense bar method?


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In the subtense bar method, the horizontal angle subtended by two targets fixed on a horizontal bar at a known distance apart is measured at instrument station by theodolite.

The two targets are at a distance s apart, and each at s/2 from centre, i.e. vertical axis. The horizontal angle α is measured carefully by means of a odolite. Then what is value of D in subtense bar method?

The following readings were taken with a tachometer on to a vertical staff. Horizontal Distance Stadia Readings 46.20 m 0.780; 1.010; 1.240 51.20 m 1.860; 2.165; 2.470. Calculate the tacheometric constants.

The two targets are at a distance s apart

and each at s/2 from the centre

i.e. vertical axis. The horizontal angle α is measured carefully by means of a theodolite. Then what is the value of D in the subtense bar method?

Area Computation & Tacheometric Surveying

Surveying