Department of Technology

ENG 200 - Surveying

Spring 2004

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Lab 7– Total Station Operations

Purpose: This lab will allow you to gain experience in the use of a "Total Station," and the time savings gained compared to transit/chain operations.

Procedure:

1.  Arrange a time with the instructor for your crew to be trained in the use of the total station. This should take 15-20 minutes.

2.  Perform the traverse of Lab 5 by "radiation" using the total station.

    1. Set the total station up over a point where you can see each of the traverse points at once. Call this point O.

    2. Level the instrument. Turn it on by pressing any key. Rotate the instrument and the telescope 360° to reset the on-board computer. Sight on point A.

    3. Measure the distance to A.
      • Press the [EDM] button to bring up that menu.
      • Press [SHV] until the first button reads [HDist].
      • Press the first switch to measure the distance OA.

    4. Measure angle AOB. 
      • With the telescope pointed at A, set the horizontal angle to zero by pressing the [0SET] key – found on page 2 of the [THEO] menu. 
      • Press [->p3] to bring up page three. Press [REP] to set the instrument to repeat angles. Press [BS] to set the backsight on point A. 
      • Turn to point B, press [FS] to record the angle. 
      • Turn back to A, press [BS], then ahead to B, and press [FS]. The instrument will show the average of the two angles turned. Continue the process to average 4 angles.

    5. Repeat steps C and D for the remaining 5 sides and angles.

    6. Calculate the azimuth of line OA.
      • Knowing the lengths of sides OA and OF, and angle FOA, determine the length of FA and angle FAO.
      • Since AF bears due East (Az = 90), the azimuth of AO = 90 + FAO.
      • The azimuth of OA = Az of AO + 180

    7. Use the software from the book to complete the calculations.

3. Determine the height of the flagpole and the dragon’s nose.

    1. Set the instrument up over one of the instrument stations.

    2. Measure the height of the target and the instrument. Use the [Ht] key on page 2 of the [S-O] function to input those heights.

    3. Set the target at the base of the flagpole, and shoot the distance to the target.

    4. Turn to the tip of the pole. Press the [REM] key on page 3 of the [EDM] menu to determine the height of the flagpole.

    5. Determine a ground point beneath the dragon’s nose by intersection.
      • With the TS at each transit station, turn horizontal angles from the other station to the dragon’s nose.
      • Shoot the distance between the transit stations.
      • Calculate the distance along one line to the point of intersection.
      • Press the [M/Trk] button in the EDM menu to switch to tracking mode. Use the TS to set the target on a point in line with the dragon’s nose at the calculated distance. Press [M/Trk] to switch back to measurement mode.

    6. With the target set on the ground point, shoot the distance and use [REM] as in step D above to determine the height of the dragon's nose.