Week 10

A traverse is a simple and popular way of establishing a control network for surveying projects by establishing coordinates for new points or they can be used to collect data, such as mapping existing features. There are two types of traverse: Closed where the start and end point are the same and open where the start and end point differ. Within this activity, a closed three station survey will be conducted.

Equipment Required

Process

1) Set out the 3 pegs in a triangle with each side approximately 25M long.

2) Set up the legs directly over a peg and attach the theodolite to the tripod.

3) Level the Theodolite using the linear bubble.

4) Label the station with the theodolite on “A”, with the other stations labelled clockwise “B” and “C”.

5) Ensure that the machine is in face left, by having the vertical circle on the left side of the machine, as you are looking through the scope.

6) Away from your triangle of pegs pace out around 30M and put a ranging rod in the ground straight.

7) Turn the Theodolite on and point it at the ranging rod and press the 0 Set button twice to zero the machine to that position.

8) Stand with the detail pole on point B and record the horizontal and vertical angles. If required use the “V/%” button to ensure the vertical angle is in degrees, minutes, and seconds.

9) Measure from the centre of the optical plummet (on the ground directly below the theodolite) to the two other pegs and record this under the “slope distance” column.

10) Turn the machine from face left to face right, by turning the scope 180 degrees horizontally and vertically and record the new readings.

11) Repeat step 10 alternating between face left and face right, until you have obtained 3 of each reading.

12) Move the detail pole to station C and repeat steps 8-11 to obtain a further 3 face left and face right readings

13) Move the theodolite to station B and repeat steps 8-12, observing stations A and C.

14) Move the theodolite to station C, and repeat steps 8-12, observing stations A and B.

Results Table

Practical Video Guide