SURVEY CAMP REPORT.doc

Survey Camp 20101

CONTENT NO.

CONTENT

i.

CONTENT

1

TWO PEG TEST

2

3

PAGE

1.1 INTRODUCTION

4

1.2 AIMS

4

1.3 EQUIPMENTS

4

1.4 PROCEDURES

4

1.5 DATA ANALYSIS

5

1.6 DISCUSSION

6

1.7 CONCLUSION

7

LEVELLING 2.1 INTRODUCTION

9

2.2 AIMS

9

2.3EQUIPMENTS

9

2.4 PROCEDURES

9

2.5 DATA ANALYSIS

10

2.6 DISCUSSION

10

2.7 SUGGESTION

11

2.8 CONCLUSION

11

TRAVERSE 3.1 INTRODUCTION

13

3.2 AIMS

13

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4

5

3.3 LEARNING OUTCOMES

13

3.4 THEORY

13

3.5 EQUIPMENTS

14

3.6 FIELD PROCEDURES

14

3.7 DATA ANALYSIS

15

3.8 DISCUSSION

15

3.9 CONCLUSION

16

TACHEOMETRY 4.1 INTRODUCTION

18

4.2 OBJECTIVES

18

4.3 LEARNING OUTCOMES

18

4.4 THEORY

18

4.5 PRACTICE EQUIPMENT

19

4.6 FIELDWORK PROCEDURES

19

4.7 DATA ANALYSIS

20

4.8 DISCUSSION

20

4.9 SUGGESTION

21

4.10 CONCLUSION

21

SETTING OUT 5.1 INTRODUCTION

23

5.2 OBJECTIVE

23

5.3 LEARNING OUTCOMES

23

5.4 THEORY

23

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5.5 EQUIPMENT

24

5.6 PROCEDURES

25

5.7 DATA ANALYSIS

26

5.8 DISCUSSION

26

5.9 CONCLUSION

28

6

FULL SURVEY CONCLUSION

7

APPENDIX

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CHAPTER 1 TWO PEG TEST

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1.1

INTRODUCTION Two Peg Test is a surveying operation carried out to determine whether the leveling bubble and

telescope line of sight are parallel.

1.2

AIM Peg Test is a surveying operation carried out to determine if the leveling bubble (bubble axis) and

telescope line-of-sight (line of collimation) of the distance between staff are 30m and 60m are parallel.

1.3

EQUIPMENTS i. ii. iii. iv.

1.4

Leveling equipment and Tripod (1 set) Staff (2 sets) Staff bubble (2 sets) Tape (1 set)

PROCEDURES 1. A peg test has been performed to check the instrument. 2. The results of the peg test recorded by each person in the group in their own field book. 3. Set out and marked on the group two points some 30m apart.(with wooden pegs driven into the earth, 4. 5. 6. 7.

1.5

or roofing nails in tar) Set up instrument midway between two pegs. On each peg, staff read and calculated the height of difference. Instrument moved about L/30=3m beyond one of the pegs (normally for staff position) Again on each staff read and calculated the height of difference.

DATA ANALYSIS

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A

B

10m

30m

30m

Distance = 30m

First set up

Reading Staff (S1) 1.219

Reading Staff A (S2) 1.658

Height difference = m 0.439

Second set up

Reading Staff B (S1’) 1.474

Reading Staff (S2’) 1.908

Height difference = m’ 0.434

First set up

Reading Staff (S1) 1.019

Reading Staff A (S2) 1.878

Height difference = m 0.859

Second set up

Reading Staff B (S1’) 1.749

Reading Staff (S2’) 2.609

Height difference = m’ 0.86

Distance = 60m

Value e

Difference (m – m’)/L

30m - 0.0002

1. If m = m’ then the instrument is OK!

60m 0.00002

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2. If NOT then the error is e = (S1 – S2) – (S1’ – S2’) / L mm/m The error is called collimation error. 3. Acceptable error: 1mm per 20

Example Distance = 30m e = [Reading Staff (S1) - Reading Staff A (S2)] – [Reading Staff B (S1’) - Reading Staff (S2’)] / L = (1.219 - 1.658) – (1.474 - 1.908) / 30 = - 0.0002

1.7

DISCUSSION

From time to time, the leveling equipment has to be tested to make sure that the equipment had no damaged that will cause’s error in reading data; it is important especially if the equipment collapse or endure vibration on the journey. The allowable determined value must be less than 0.005m (