Linear Surveying practical(1).doc

Faculty Of Arts, Design and Technology

School of Engineering and Technology

Practical 

Linear  Surveying Procedures

Task 1                            Chaining A Line

Place two ranging poles approx. 20m apart on level ground.

(a)        Measure between the two poles and record the distance.

(b)        Measure in the opposite direction using a tape.

(c)         Compare and comment on the accuracy of your results

(d)         Extend the line to 30m by sighting in the next point

(e)         Finally, sighting in again position poles every 5m.

Task 2                            Setting Out A Right Angle

Using the line in the first task, from the 15m ranging pole set out a right angle by:

(a)                3 : 4 : 5 method

(b)               striking arcs

Task 3                            Offsetting a line

Using the right angle offset a line to run parallel to the first a distance of 3.5m

If time allows consider the following

Task 4                            Reciprocal Ranging

Place two ranging poles approx 30m apart, but not visible from each other due to sloping ground.  By reciprocal ranging establish two ranging poles in line with the original two and in between them.

Task 5                            Detached  Obstacle

Place four ranging poles A, B, C and D in line approx. 15 apart. Between the middle two poles is a detached obstacle to measuring, but not sighting. Use a suitable method find the distance BC. Measure BC to compare your results and comment on the accuracy of your work.

D

C

B

A

Pond