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Which of the following is propose of tacheometry ?
Contouring
Hydrography survey
Topography map
All of the above
All of the above
Tacheometry is a branch of angular surveying in which the horizontal and vertical distances of points are determined by optical measurements, eliminating the need for slow and tedious chain or tape measurements. It is extensively used in difficult terrains for preparing topographic maps, conducting hydrographic surveys, and carrying out contouring efficiently.
Tacheometry is a branch of angular surveying in which the horizontal and vertical distances of points are determined by optical measurements, eliminating the need for slow and tedious chain or tape measurements. It is extensively used in difficult terrains for preparing topographic maps, conducting hydrographic surveys, and carrying out contouring efficiently.
D=KS+C тАФ Horizontal distance formula for horizontal line of sight
K=ifтАЛ=100 тАФ Multiplying constant of the tacheometer
C=f+d=0 тАФ Additive constant for an anallatic lens system
Tacheometry relies on the principle of similar triangles. By taking staff readings corresponding to the upper, middle, and lower stadia wires of a tacheometer (a transit theodolite fitted with a stadia diaphragm), the distance between the instrument and the staff is computed using optical geometry without direct chaining.
Primary objective is the rapid indirect measurement of horizontal distances and elevation differences.
Eliminates the use of chain or tape, making it ideal for rough, hilly, or broken ground.
Anallatic lens is fitted in the telescope to make the additive constant (C) equal to zero.
Extremely fast and economical compared to conventional chaining in rough terrain.
Eliminates errors associated with tape sag, slope corrections, and temperature variations.
Simultaneously provides both horizontal location and vertical elevation data for contouring.
Less accurate than careful chaining or electronic distance measurement (EDM) on flat ground.
Accuracy decreases significantly at longer sight distances due to refraction and poor visibility.
Preparation of topographic maps containing both details and contours.
Hydrographic surveys for measuring water bodies and river cross-sections.
Location surveys for roads, railways, and canal alignments across difficult ground.
Option A (Contouring): Tacheometry provides horizontal distances and reduced levels simultaneously, making contouring extremely fast.
Option B (Hydrographic survey): Ideal for taking soundings and measuring shoreline points where direct chaining is impossible across water.
Option C (Topographic map): Used for locating natural and artificial features along with ground elevation contours.
D is correct тАФ Tacheometry is used for contouring, hydrographic surveys, and topographic mapping because it provides both horizontal distances and elevations indirectly.
Remember for exam questions: For an ideal tacheometer fitted with an anallatic lens, the multiplying constant K=100 and the additive constant C=0.
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