Staff at Vertical Angle Staff Reading Upper Middle Lower P -5°12' 1.388 0.978 0.610 Q +27°35' 1.604 1.286 0.997
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- Question: 1 To determine the elevation of station A, the following observation were taken, the rod held vertically. The instrument fitted with Anallatic lens and value of constant was 100. Inst. Station Height of instrument Staff Station Vertical angle Staff Reading Remarks O 1.440 B.M - 5o40’ 1.332 1.896 2.460 R.L of BM = 158.205 m B 1.440 C.P +8o 20’ 0.780 1.263 1.746 A 1.380 C.P -6o 24’ 1.158 1.617 2.076 subject: Engneering surveyin 1(9) The following observations were made in a tacheometric Survey. Inst. Station A A B Hair Height staff vertical of axis station angle readings 1.345 BM 1345 B 1.550 -5° 30' 0.905, 1.455, 2.005 Remark RL of BM +8°0' 0.755,1.655, = 450-500 m +10 2.555 1.500, 2.250,3.000 Calculate the RLs of A, B and C, and horizontal distances AB and BC. The tacheometer is fitted with an anallatie Lens and the multiplying constant is 100The following tacheometric observations were 'thade on two points P and Q from station A. Staff at Vertical Angle Staff Reading Upper Middle Lower P -5°12' 1.388 0.978 0.610 +27°35' 1.604 1.286 0.997 The height of the tacheometer at A above the ground was 1.55m. The stadia constant k and c are respectively 100 and 0.0m. Determine the elevations of P and Q if the elevation of A is 75.5 m Determine the horizontal distance between P and Q if Station A is between the two stations. Show an illustration of your work. « Previous Next
- Two pegs A and B are driven in the ground at a distance of abour 120 m. A dumpy level is set up at station Q exactly mid-way between pegs A and B. The staff readings on peg A and B were found to be 3.513 m and 3.149 m. The instrument was then moved and set up at a point P beyond peg A, in line BA produced at a distance of 20 m from A. The staff readings on pegs A and B were 1.763 m and 0.847 m respectively. What is the true difference in elevation between the two points? With the level in the same position at P what rod readings on B should the line of sight is adjusted. Check these reading against the true difference in elevation previously SOLVE THE FOLLOWING PROBLEMS: Problem Sketch Solution AnswerA tacheometer was set up at B.M and the following observations were made with a leveling staff held vertically at P and Q. Ins: Station Staff Station Vertical Angle Hair Readings Bearings Remarks B.M P +10° 00’ 1.050, 1.103, 1.156 40° R.L of B.M =1958.500 ft Q -15° 00’ 0.952, 1.055, 1.158 140° The constant of instrument (f/i) = 100, Height of instrument = 5.15 ft Compute: The horizontal distance between P and Q Reduced Levels of P and Q Grade between P and QTwo pegs A and B are driven in the ground at a distance of abour 120 m. A dumpy level is set up at station Q exactly mid-way between pegs A and B. The staff readings on peg A and B were found to be 3.513 m and 3.149 m. The instrument was then moved and set up at a point P beyond peg A, in line BA produced at a distance of 20 m from A. The staff readings on pegs A and B were 1.763 m and 0.847 m respectively. What is the true difference in elevation between the two points? With the level in the same position at P what rod readings on B should the line of sight is adjusted. Check these reading against the true difference in elevation previously determined. a. Sketch b. Solution C. Answer
- Following are the observations recorded using a total station between two points Aand B:The zenith angle is 82°32'20", the slope distance is 8335.26 ft. The height of theinstrument and rod recording r are equal. If the elevation of point A is 1431.31 ft.Determine the elevation of point B.A Tachometer is set up at an intermediate point on a survey line PQ and the following observations were made on a vertically held staff. Staff intercept 1.235 m 1.115 m Axial hair readings 2.445 m 1.335 m Staff station Vertical angle 15° 20 ' 50" 12° 40 ' 10 " i) Compute length of the line PQ. 2.5 ii) Compute R.L of Q, if R.L of P is 189.66 m 2.52) Given the following data: Table 1: Differential Leveling Observations Station A TP1 B TP2 A Elevation 13.869 m 11.445 m 9.643 m 11.189 m 13.875 m Notes Known and Fixed Temporary Point of Interest Temporary Close Loop a. What is the loop misclosure? b. What is the corrected elevation of point B using an adjustment by setups? 12
- Reciprocal leveling gives the following readings in meters from a set up near A: on A, 1.110; on B, 0.887, 0.995, and 0.884. At the setup near B: on B, 1.549; on A, 1.673, 1.670, and 1.666. The elevation of A is 1045.343 m. Determine the misclosure of B. Express your answer to three decimal places and include appropriate units. Misclosure = Submit Part B elevB = μÁ Value Request Answer CHA Value Units Determine the elevation of B. Express your answer to three decimal places and include appropriate units. Units ? ?Find the equal height of towers at triangulation stations A and C so that line AC will clear theelevated ground between A and C by 6m. with the instrument set at point B, the observedvertical angle to ground station A is 0 0 55’ and the vertical angle to ground station C is 0 0 48’.Elevation of A is 237m. Distance AB is 10km and distance of BC is 8.7km. Yhe instrument set-upat B is 2.7m above the ground. Use hcr= 0.067k ^2*Refer to the following notes for reciprocal levelling taken with simple level. Determine (a) the true R.L. of B (b) Collimation correction (c) Refraction correction (d) Combined correction Instrument Station A B Staff reading on A B 1.305 2.725 1.355 2.050 Remarks Dist. AB = 905 m R.L of A = 100 m collimation error -0.003/150