Differentiate between Bowditch’s rule and the transit rule for the adjustment of a traverse. Explain both the methods of adjustment.
Answers
Answer:
The main difference is that with the transit rule the latitude and departure corrections depend on the length of the latitude and departure of the course respectively instead of both depending on the length of the course.
Explanation:
Bowditch's rule, also termed as the compass rule, is mostly used to balance traverse when linear and angular measurements are equally precise. By this rule, the total error in latitude or departure is distributed in proportion to the lengths of the traverse legs.
Transit rule, A rule for adjusting the closure error in a traverse. The transit rule distributes the closure error by changing the northings and eastings of each traverse point in proportion to the northing and easting differences in each course.
Answer:
Difference between Bowditch’s rule and the transit rule:-
Bowditch’s rule is used to balance the traverse when the linear and angular measurement are equally precise while transit rule is used to balance the transverse when the angular measurement are more precise than linear measurements.
Bowditch’s rule:-
Bowditch’s rule or compass rule is most common method to traverse adjustments. By they rule, the total error in latitude or departure is distributed in the proportion to the lengths of traverse legs.
Correction to latitude of any line:
= length of that line/ perimeter of the traverse)× total error in latitude
Correction to departure = (length of that line/perimeter of the traverse)×total error in departure
Transit rule:-
By this rule, the angle are measured with more precision and error in latitude or departure is proportional to its latitude or departure. This method is adjusting the consecutive coordinates of traverse is completely empirical and no theoretical base for it.
Correction to latitude of any line:
= (length of that line/ arithmetic sum of all latitudes) × total error in latitude
Correction to departure
= (length of that line/ arithmetic sum of all departures) × total error in departure
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