Question 1

What is traverse closure error?

Accepted Answer

Traverse closure error is the difference between the computed final position and the known starting point after traversing a loop. Closure error = sqrt(delta E^2 + delta N^2). Precision = 1 / (total perimeter / closure error). A precision of 1:5000 means the error is 1 unit per 5000 units of traverse length, which meets most engineering survey standards.

Question 2

How is cut and fill volume calculated in surveying?

Accepted Answer

Average end area method: V = L/2 x (A1 + A2), where L is the distance between cross-sections and A1, A2 are the end areas. The prismoidal formula is more accurate: V = L/6 x (A1 + 4Am + A2), where Am is the area at the midpoint. Prismoidal gives a 10-15% more accurate result for curved sections.

Question 3

What is the allowable closure error for a level loop?

Accepted Answer

Allowable level loop closure = C x sqrt(K), where K is total distance in km and C is the tolerance constant. For third-order levelling, C = 12mm. For second-order, C = 8mm. For first-order, C = 4mm. A 10km loop at third-order allows 12 x sqrt(10) = 37.9mm misclosure.

Question 4

Are these surveying tools free?

Accepted Answer

Yes - completely free, no sign-up required. Results export to CSV or PDF.

Free Surveying Tools & Calculators

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