Which station a significant bearing error was made

Reference no: EM133240802

Question 1 Land boundary and area problems

You have been approached by a client to complete a 4 lot subdivisional for Lot 14, the exact area is to be calculated by close (14.68ha is for data presentation only and shown only to 4 significant figures). Surveyed dimensions of Lot 14 have been provided below with a proposed design (see sketch below). You are required to calculate the dimensions of the new lots, using an exact area, as per client proposed design:

Lots 1 and 2 is to be an exact 105m perpendicular width from the Lot 13/14 western boundaries (i.e. 105m perpendicular to 10d 03' 00" and 331d 32' 34" with the remaining boundaries being at the half angle and parallel). The remaining 2 lots (say Lots 3 and 4) are to be equal area, with the Lot 3 and Lot 4 Prism Court boundaries being exactly halfway (they will be around 130m) along the residual distance of the northern boundary of Prism Court. Include a sketch showing the dimensions (bearings and distances) of all lots and the areas of all lots.

Instructions for completion of question:

Show full working for calculations and document entries for closes and any results to obtain full marks. Answer to be completed by a combination of manual/Close methods:
(i) Manual calculation of the 105m width dimensions Manual calculation of the half angle boundary Lots 1/2 Close MBD calculation for the eastern boundary of Lots 1 and 2 Close Area calculation for Lots 1 and 2.

(ii) Manual calculation of equal areas (use Lot 14 exact area calc.) Close MBD calculation for the Lot 3/4 common boundary Close Area calculation for Lots 3 and 4.

Question 2 Total stations, Traversing

a. A traverse was measured clockwise from A-B-C-D-A using an external bearing Datum (A-E). Calculate the angular misclose and adjusted bearings for the traverse. Use 12",ln as the allowable misclose for traversing, where n is the number of angles read, calculate the allowable angular misclose and state whether the angular misclose was acceptable or not.

b. A traverse on an arbitrary bearing has been completed as per table below.

You are required to swing the traverse (by Close) onto a nominated fixed bearing datum (AB). Confirm the correct orientation of the result.

c. (i) There are three dominant instrument errors for horizontal/vertical angular measurement in Total stations plus one that arises when the instrument is not properly levelled. Discuss the four errors and whether they are eliminated by FL and FR measurement. You should research this question with sources away from the study book and you must reference any sources of information.

(ii) Provide a numeric example for two of these errors.

d. A closed loop traverse (see table below) was surveyed and there was significant angular misclose in the traverse. Your closing bearing is close enough to be an exact 10 degree gross error (for all intents and purposes). You suspect you have set an incorrect backsight by a neat 10 degrees at one station. Isolate and determine at which station a significant bearing error was made (manual/Excel/Close coordinate options all acceptable). Confirm the veracity of your assumptions.

Question 3 Levelling

a. A level traverse commences from a Benchmark RL of 302.615m and the following readings obtained: Booked down the page
At the final position of the instrument (CP4), a Peg is to be marked up at a reduced level of 302.000m. Calculate the staff reading to comply with that request using the Height of collimation booking method and enter the results in level book form. Apply any checks as is necessary. If the TBM has a known reduced level of 301.370, state whether the level traverse met the required standard if the distance from BM1 to TBM is 400m for 12Nik mm precision.

b. The company you work for has won the tender to do a contour and feature survey over Empire Park in Newcastle for a planned upgrade to the facilities and sporting grounds. Your project is to place and survey the vertical control for the project.

You will be using two existing marks as fixed datum points, SS 185500 and SS 146562, to establish and adjust your marks, and connecting to a third mark, SS 185501, as a check only.

Attachment:- Land boundary and area problems.rar

Reference no: EM133240802

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