A trigonometric leveling conducted by Jereza Surveying Company, the two points A and B of a certain rough terrain are each distance 2000 m from a third point C, from which measured vertical angles to A is +3°30' and to B is +1°30'. Elevation at C is known to be 342.60 m above sea level. Point C is in between A and B. a) Compute the difference in elevation between A and B considering the effect of the earth's curvature and refraction. b) Compute the difference in elevation between B and C. C) Compute the elevation of A.

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Methods of Surveying

Surveying is the practice to determine the relative three-dimensional positions of various points on the earth’s surface. This is done by computing the vertical and horizontal distances, angles between the points, collecting the observations, and plotting them on a map of any appropriate scale. Accuracy can be achieved by using the latest instruments like a theodolite, tachometer, etc. Leveling is a subdivision of surveying where the objective is to locate the elevation of objects considering a datum level.