A level loop was run and the raw elevations in Table 2 were calculated based on backsights and foresights. A plan view of the loop is shown in Figure 2. The true elevation of BM1 is 195.00 ft. Adjust the elevation of each station such that the error is evenly spaced. Show sample calculations of your work. Also determine the accuracy ratio of the survey.

A level loop was run and the raw elevations in Table 2 were calculated based on backsights and foresights. A plan view of the loop is shown in Figure 2. The true elevation of BM1 is 195.00 ft. Adjust the elevation of each station such that the error is evenly spaced. Show sample calculations of your work. Also determine the accuracy ratio of the survey.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter14: Highway Surveys And Location

Section: Chapter Questions

Problem 5P

See similar textbooks

Similar questions

Surveying Question: A differential leveling circuit starts at benchmark Concrete Benchmark (Elevation=232.051m) goes out to an unknown benchmark and then continues to a known control point (Elevation=227.975m). Two turning points are used with the measurements included in the attached table. Determine the elevation of the unknown benchmark Determine the order and class of the survey. For First order Class 1: Allowable Error= +/- 4(K)1/2 Range of Constant= m less than/equal to 4 For First Order Class 2: Allowable error= +/- 5(K)1/2 Range of constant= m greater than/equal to 4, and m less than equal to 5 (between 4 and 5) For Second Order Class 1: Allowable error = +/- 6(K)1/2 Range of Constant = m greater than/equal to 5, and m less than equal to 6 (between 5 and 6) For Second Order Class 2: Allowable error = +/- 8(K)1/2 Range of Constant = m greater than/equal to 6, and m less than equal to 8 (between 6 and 8) For Third Order, Any Class: Allowable Error = +/-12(K)1/2 Range…
A tachometric surveying was conducted to obtain some readings forinaccessible points, where it was found that the multiplying and additiveconstants are 98 and 0.1, respectively. The instrument was setup at point C and the readings listed in the table were taken while the staff was held vertically. Calculate the horizontal distance between BM and station D. Also, calculate the reduced level of station D. Figure 1 shows a schematic view of the site.
1) 2 points B & C were observed from point A where the instrument was set up at a height of 1.25m. Points B & C are ahead of point A. The surveyor used an internally focusing telescope with a stadia interval factor of 100. The table below shows the data recorded as observed for points B & C. Answer the following. (Show complete figures and solutions) a) What is the stadia constant of the instrument? b) What is the slope distance between the telescope at point A and the rod reading at point B? c) What is the difference in elevation between point B & C? d) What is the slope distance between the ground surface at point B and the ground surface at C? e) What is the elevation of point C if point A is at an elevation of +0316.15m above mean sea level? - 1 attachment Vertical Stadia Hair Readings ROD/Point Angle Upper Middle Lower В -25°15' 2.316 1.877 1.438 -45°57' 3.333 2.011 0.689
I need Answer of A only A. A tachometric surveying was conducted to obtain some readings forinaccessible points, where it was found that the multiplying and additiveconstants are 98 and 0.1, respectively. The instrument was setup at point C and the readings listed in the table were taken while the staff was held vertically. Calculate the horizontal distance between BM and station D. Also, calculate the reduced level of station D. Figure 1 shows a schematic view of the site.
2 points B & C were observed from point A where the instrument was set up at a height of 1.25m. Points B & C are ahead of point A. The surveyor used an internally focusing telescope with a stadia interval factor of 100. The following data was recorded as observed for points B & C.(a) What is the stadia constant of the instrument?(b) What is the slope distance between the telescope at point A and the rod reading at point B?(c) What is the difference in elevation between point B & C?(d) What is the slope distance between the ground surface at point B and the ground surface at C?(e) What is the elevation of point C if point A is at an elevation of +0316.15m above mean sea level?
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 2.5
5) It is desired to determine the height of point B using point A whose height is 650.24 m. By installing Nivo (level) between A and B points, a reading is made as 564 mm on the Mira that is located in point A. Then the Nivo's binoculars were rotated and a forward reading of 3245 mm was made on the Mira held on point B. Based on this knowledge, what is the height of point B?
Problem 8: The following are the results of the measurement of a survey line between two tripod heads, where the tape was allowed to Sag Line AB Slope Length Vertical Angle Temperature Tension 25.510m 6° 00' 20 °C 80 N The Tape weighted 0.25 N/m; had cross sectional Area of 3mm2 and was actually 30.005 m long at the time of measurements. Where the nominal length of the tape is 30.0 m Calculate the corrected horizontal length of the Line AB
3. The following questions refer to the set of differential leveling notes shown in Table 2. a. Determine the elevation of each station. b. The elevation of BM 132 is known to be 153.235 m. The length of the level run was 780 m, with each station equally spaced. Adjust the elevation of each station such that the error is evenly spaced. Show sample calculations of your work. c. Determine the accuracy ratio and state whether the survey meets the requirement of an accuracy ratio of less than 1/3,000. Station BM 130 TP 1 TP 2 TP 3 BM K110 TP 4 BM 132 Table 2 BS [m] HI [m] 0.608 1.030 0.482 1.591 2.145 1.997 FS [m] Elevation [m] 153.285 1.525 0.736 2.83 1.885 1.795 0.321
A survey party proceeded to do their stadia survey work as follows: the transit was set up at a point A and with the line of sight horizontal, took rod readings with the rod at point B and C, which were then measured to have taped distances from A to 200 m., and 60 m. respectively.Rod B Stadia Interval 2.001 m Rod C Stadia Interval 0.600 mThe distance from the center of the instrument to the principal focus was recorded as 0.30 m. Then they went on to survey other points, with some of the data recorded as follows: with the transit at point D, two points E and F were sighted.Rod E:Stadia Interval 2.120 m Vertical Angle + 4⁰22’ Rod F Stadia Interval 3.560 m Vertical Angle - 3⁰17’a. Compute the stadia interval factor.b. Compute the horizontal distances DE and DFc. Compute the differences in elevation between points D and E and points D and F.
(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 100
A line of three-wire differential levels goes from benchmark Gloria to benchmark Carey. The length of the line was determined to be 2097 m. The instrument had a stated compensator accuracy of pm 1.4 mm/ km. The instrument–rod combination had an estimated reading error of 0.4 mm per 40 m. Sight distances were kept to approximately 50 5 m. If the observed difference in elevation is 15.601 m, what is the estimated error in the final elevation difference? If benchmark Gloria had a fixed elevation of 231.071 m and Carey had a fixed elevation of 246.660 m, did the job meet acceptable closure limits at a 95% level of confidence? Justify your answer statistically.