Correct Answer - Option 3 : Axis method
Explanation:
Axis method:
(i) This method is used to balance a traverse where angles are measured more precisely than the lengths and thus this axis method is used for correction of lengths only.
(ii) Since the angles are measured more precisely and therefore the direction of lines do not change much while applying the correction and thus the general shape of the traverse do not change much.
(iii) In this method, the correction applied to any traverse line is expressed as
(one half of closing error × Length of traverse line)/Axis length
Methods of Traverse Adjustments:
- Arbitrary Method
- Bowditch's Rule
- Transit Rule
- Axis Method
1. Arbitrary Method:
(i) In this method of traverse adjustment, the linear error of mis-closure is distributed arbitrarily depending on the surveyor's judgment. The surveyor nay decides to have large correction in some of the sides of traverse as compared to other traverses.
2. Bowditch's Rule:
(i) This method of traverse adjustment is suitable where linear and angular measurements are made with equal precision.
(ii) This method is usually used for balancing a compass traverse but can be used for theodolite traverse also provided angular and linear measurement is done with the same precision.
3. Transit Rule:
(i) This method of traverse adjustment is used in situations where angular measurements are made with more precision as compared to linear measurements.
(ii) In theodolite traverse, angular measurements are more precise as compared to linear measurement, and thus this method quite suitable for theodolite traeverse.
