Theodolite surveying part1

Advanced Surveying (22301) I scheme MSBTE curriculum
Chapter2- Theodolite Surveying

1. 2.THEODOLITE SURVEYING (24 MARKS) By Mr. Naufil Sayyad

2. Course outcome ( CO) b. Prepare plans using Theodolite surveys.

3. Practical outcomes ( PrOs)

4. Unit outcomes ( UOs)

5. Unit outcomes ( UOs)

6. Introduction Theodolite is an intricate instrument used mainly for accurate measurement of horizontal and vertical angles up to 10” to 20” depending upon the least count of the instrument. Because of its various uses the Theodolite is sometimes known as Universal instrument.

7. Uses of Theodolite Measurement of Horizontal angle Measurement of vertical angle Measurement of magnetic bearing of a line Measurement of Deflection angle Measuring the horizontal distance between two points Finding the vertical height of an object Finding difference of elevations between various points Ranging a line

8. Types of Theodolite Based on type of telescope

9. Types of Theodolite Based on reading unit

10. Vernier Theodolite Digital/Electronic Theodolite Micro Optic Theodolite

11. Component parts of Theodolite

12. Telescope Altitude bubble Vertical Clamping screw Trunnion axis

13. Vertical Circle Eye piece Plate level Upper plate Vernier A/B Lower Plate Inner spindle Outer spindle20

14. Tribrach Levelling screw Trivet

15. Technical terms Swinging It indicates turning the telescope in the horizontal plane. It is called Right swing when telescope is turned clockwise and left swing when telescope is turned anticlockwise.

16. Technical terms Transiting The method of turning the telescope about its horizontal axis in a vertical plane through 180° is termed as transiting. In other words transiting results in change in face.

17. Technical terms Face left Face left means the vertical circle of the theodolite is on the left of observer at the time of taking readings. The observation taken in the face left position is called as face left observation

18. Technical terms Face Right Face right means the vertical circle of the theodolite is on the right of observer at the time of taking readings. The observation taken in the face right position is called as face right observation.

19. Technical terms Changing face The operation of bringing the vertical circle from one side of the observer to other is called as Changing face.