WEEK 2 Report - TOPIC: LINEAR MEASUREMENT BY METRIC CHAIN PDF

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TOPIC: LINEAR MEASUREMENT BY METRIC CHAIN...

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FACULTY OF PROG./COURSE CODE : AGR242 COURSE : GENERAL FIELD MAINTENANCE TOPIC: LINEAR MEASUREMENT BY METRIC CHAIN FIELDWORK NO. G. LEADER NAME MATRIC NO. GROUP (COURSE) NO. 1. 2. 3. 4. 5.

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CHECK LIST FOR REPORT SUBMISION & CONTENT 1. 2. 3. 4. 5. 6. 7. 8.

REPORT COVER – fill in all the blanks, print and submit Introduction (summarise) Objectives (summarise) Learning outcomes (summarise) Procedures Proposed Sketch Traverse (during fieldwork) Bookings of Survey Data (during fieldwork) Scale Plotting of Surveyed Traverse without closing error (uncorrected) on A3 9. Bowditch Correction Value 10. Scale Plotting of Surveyed Traverse (corrected) Superimpose with Surveyed Traverse (uncorrected) on A3 11. Scale Plotting of Proposed (corrected) Traversed and Calculate the area on A3 12. Conclusion 13. Discussion and Recommendations 14. Appendixes: Others- Photographs, Tables & Sketches with captions

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INTRODUCTION The most precise and popular method of calculating distance is chaining, which is the method of measuring distance with a chain or tape. When you use instruments like a ruler, yardstick, or tape measure to measure objects in a straight line, you're doing linear measurement. Metric chains are usually available in 5, 10, 20, and 30 metre lengths. Chaining is a term that refers to measuring distance using a chain or a tape, and it is the most precise way of taking direct measurements. One basic operations of surveying is the determination of the distance between two points on the surface of the earth. This can achieve by direct measurement or indirect measurement. Direct measurement is done by conducting chain survey, using EDM or distometer. The indirect measure can be done by carrying out tacheometry survey photogrammetry. The measured distances are then presented graphically or numerically. OBJECTIVES To determine the measurement of the distance between two points on the earth's surface which can be accomplished by direct or indirect calculation.

LEARNING OUTCOME By the end of this FW session students should be able to: i. ii. iii. iv. v.

Chain and linen tape is using to measure linear measurement Range traversed lines correctly Plot the traversed with suitable scale Bowditch Method is using to perform correction of unclosed traversed The Traverse Line is using when find the area cover

PROCEDURES 1. At least five (5) control points (CP) with a minimum length of 30m have to be established at the proposed site. 2. Then the arrow are driven into the ground at the control points for marking the areas. 3. Sketch the approximate Traversed, Base, Tie, with corresponding distances in the field book, 4. To range the line using ranging rods at each end of the line using plum bob, so that both of them vertical. 5. Squat down behind one terminal rod to get low line of sight, lining up the sides of the rods. 6. An assistant will hold a ranging rod approximately on the line just short of a tape length, standing off the line himself.

7. The rod is held lightly between thumb and fore-finger, high up to hang vertically. 8. Signal a shift to the left or right to the assistant until the side of the three rods line up. 9. Check also the opposite sites also line up. 10. Signal for the rod to be placed by forcing the ranging rod into the ground. 11. Check verticality and see whether any final adjustment are needed. 12. Repeat step 6 if ranging needed for other points on the line. 13. Pull the chain and place beside the ranging rods and measure the distance 14. Place an arrow at every chain length (30m). 15. Measure the whole length of the Base, Traverse and Tie Line. 16. Note all the Bookings of the line lengths in the field book (Survey Data Table). 17. Measure all the traversed lines AB, BC, CD, DE, EA 18. Also measure the relevant Base and Tie Lines. 19. Plot the traversed to a suitable Scale. 20. Start the plotting of traverse with the Base Line BE. 21. Make final correction by using Bowditch Method if the traversed failed to close. 22. Calculate the Area. BOOKINGS OF SURVEY DATA Line AB BC CD DE EA BE BD EC AD AC

Distance (m) 31.00 30.20 30.20 30.20 31.00 51.20 45.60 58.20 58.20 49.60

CONCLUSION When taking linear measurements, the length of the chain was measured with a measuring tape and found to be 30 m, indicating that the chain had not lost any length. However, sag, stress, and slope corrections could not be applied because the instruments needed to measure temperature, tension, and vertical angles were not available. Each group member alternated between all levelling tasks, and each member was able to read staff readings, keep the survey staff, and level the level at any given time. REFERENCE

Reference from lecture given by Sir Redzuandi Abdul Rahim APPENDIXES

Ranging Rode/ Poles

Measuring the land

Measuring the land

Arrows

Chain...