It employs the theory of plain surveying. It’s assumed that the distances measured are small in comparison to the radius of earth and therefore the influence of earth’s curvature ad refraction can be overlooked.Differential leveling is executed when the gap involving two points is more. In this process, variety of inter stations can be found an
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The opposite altimeter, referred to as roving altimeter, is taken to the points whose elevations are preferred. Readings of the roving altimeter taken at the desired details are altered later on in accordance with alterations in temperature as well as like noticed at the Command issue.Surveyors build reference factors or benchmarks at regarded ele