what is the answer to b. i & ii? The slope distance between twostations A and B measured with EDM when corrected for meteorological conditions and instrument constants,is 113.893 m. Theheights of the instrument and reflector are 1.739 m and 1.839 m, respectively, above the ground. To measure the vertical angle a theodolite was set up at A, 1.665 m above the ground and a target at B having height above the ground as 1.632 m. The measured angle above the horizontal was + 4°22′18″. Determine a. The horizontal length ofthe line AB. b. To what precision the slope angle be measured: if the relative precision of the reduced horizontal distance is to be 1/100000. if the reduced horizontal distance is to have a standard error of ± 1.8 mm.

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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.