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Determining the relative height of┬а points on, above or beneath the surface of the earth called to
Levelling
Surveying
Both A and B
None of the above
Levelling
Levelling is a branch of surveying used to determine the elevation of specific points relative to a horizontal datum (typically Mean Sea Level). It focuses exclusively on the vertical distances, whereas general surveying encompasses both horizontal and vertical measurements.
Levelling is a branch of surveying used to determine the elevation of specific points relative to a horizontal datum (typically Mean Sea Level). It focuses exclusively on the vertical distances, whereas general surveying encompasses both horizontal and vertical measurements.
ReducedLevel(RL)=Height┬аof┬аInstrumentтИТStaffReading
╬ФHABтАЛ=BSтИТFS тАФ where BS is Back Sight and FS is Fore Sight
Levelling utilizes a spirit level or automatic level to establish a horizontal line of sight (line of collimation). By taking back-sight and fore-sight readings on a graduated leveling staff, the difference in elevation (╬ФH) between points is calculated by subtracting the staff readings.
The fundamental purpose of levelling is to establish the vertical control for a project.
Mean Sea Level (MSL) serves as the universal datum for levelling in India.
Common methods include Height of Instrument method and Rise and Fall method.
Highly precise for determining relative elevations.
Essential for earthwork estimation and drainage design.
Limited to vertical measurement; does not provide planimetric coordinates.
Susceptible to errors from instrument settlement or refraction.
Contour mapping for site development.
Determining depths of cuts and fills in highway engineering.
Monitoring structural settlement.
Levelling is a subset of surveying. While surveying covers both horizontal and vertical control, levelling is specifically dedicated to the determination of vertical heights.
Option B is too broad; surveying includes traversing, triangulation, and GPS mapping which are not primarily concerned with relative heights.
A is correct тАФ Levelling is the specific branch of surveying concerned with determining the vertical distances or relative heights of points on the Earth's surface.
In competitive exams, always remember that 'Levelling' is the 'Y-axis' (vertical) of surveying, while 'Traversing' typically handles the 'XY-plane' (horizontal).
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