1. Data shown is obtained from a double rodded line of levels of a certain cross section a. Determine the difference in elevation of BM1 and TP2 b. Find the Elevation of BM2 STATION BM1 BM1 TP1-L TP1-H TP2-L TP2-H TP3-L BS(m) 8.26 8.26 12.87 8.65 13.56 11.2 9.17 FS(m) |ELEV(m) 458.45 2.26 11.36 5.32 6.36 7.51 10.11 TP3-H BM2 BM2 5.11 6.66 6.66 2. Find the elevations of all stations. STA. BM 0+00 0+20 0+40 0+60 0+80 1+00 1+20 BS |0.663 IFS FS HI ELEV 98.76 1.946 1.008 1.153 2.787 1.585 2.270 1.218 0.646

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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.