Two hills A and C have elevations of 400m and 650m respectively. In between A and C is another hill B which has an elevation of 830m and is located 16km from A and 12km from C. Find the height to be reduced from hill B so that station C will be visible from A. What height of tower must be constructed at C so that it could be visible from A with the line of sight having a clearance of 3m above hill B? What height of equal towers A and C could be constructed so that A, B and C will be intervisible with 3m clearance at B?

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Q: Cathedral Hill is on a line between Constable Hill and Aurora Hill. Cathedral Hill is 6.235 km from…

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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.