Construction Surveying Attendance Quiz 120CT17 Name Compute the following trigon

Question

Construction Surveying Attendance Quiz 120CT17 Name Compute the following trigonometric leveling problem. Include typical math check. A BS reading of -0.555 was taken using a Total Station to a BM with an elevation of 100.00. Then, a FS reading of 1.545 was taken to TPt. The Total Station was moved forward, and a BS reading of 1.295 was taken to TP. Next, a FS reading of -2.355 was taken on the Center of Polygon. Polygon. Finally, the prism pole was moved to the BM and a FS reading of 3.955 was read. The Total Station was moved, and a BS reading of 2.350 was taken to the Center of 3.) What is the Elevation of the Center of Polygon? 4.) What is the Error of Closure?

Explanation / Answer

3)Elevation of BM=100

BS = -0.555

Height of instrument = 100-0.555=99.445

FS reading of TP1=1.545

Elevation of TP1=99.445-1.545=97.9

BS taken=1.295

Height of instrument=97.9+1.295=99.195

FS taken at at center of polygon = -2.355

Elevation of center of polygon = 99.195-(-2.355)=101.55

4)Further, BS taken from center of polygon = 2.35

Height of instrument = 101.55+2.35=103.9

FS at BM=3.955

Elevation of BM = 103.9-3.955=99.945

Error of closure = Observed elevation of BM-Actual elevation of BM=99.945-100=-0.055

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