Question

When the angular and linear measurements are equally precise in traversing, the balancing of a traverse is done by
1. transit rule
2. empirical rule
3. Bowditch’s rule
4. Any one of the above

Answer 1

Correct Answer - Option 3 : Bowditch’s rule

Bowditch Rule is used when length and bearing both are equally precise. In this method, total error in Latitude and Departure is distributed as per the ratio of length of lines i.e.

Correction in Latitude is:

\({C_L} = \;\frac{l}{{{\rm{\Sigma }}l}} \times {\rm{\Sigma }}L\)

Correction in Departure is:

\({C_D} = \;\frac{l}{{{\rm{\Sigma }}l}} \times {\rm{\Sigma }}D\)

Where ΣL and ΣD are total error in latitude and departure respectively.

Σl is the summation of length of all lines involved in closed traverse.

Note:

Transit rule is used when bearings are more precise then length of line.