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Homework_11_corrected

Homework_11_corrected - B X ∎ ∎ 63 34’30” 94...

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Unformatted text preview: B X ∎ ∎ 63 34’30” 94 39’20” 45 12’15” 40 09”05” A ∎ C ∎ Spring 2010 CEE 291 – PROBLEM SOLVING WITH COMPUTER TOOLS Homework 11 1. Distance and angle measurements and their estimated standard deviations (see table below) were measured for the closed, 4-sided traverse, ABCDA. Station occupied Station sighted Distance, ft σ, ft Station backsighte d Station occupied Station foresighted Angle Σ A B 227.40 ± 0.022 A B C 85 37’31” ± 6” B C 377.87 ± 0.022 B C D 52 46’40” ± 4” C D 237.57 ± 0.022 C D A 137 02’57 ” ± 2” D A 220.04 ± 0.022 D A B 84 32’37” ± 9” a. If each angle was measured twice, do the angles meet closure limits at 95% confidence level? b. If the azimuth for AB is 116 27’50”, what are the azimuths and their estimated standard errors for BC, CD, and DA? c. Determine the actual and estimated linear misclosures of the traverse and the 95% probable traverse misclosure error. Does the traverse meet acceptable closure limits at a 95% confidence level? Justify your misclosure error....
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Homework_11_corrected - B X ∎ ∎ 63 34’30” 94...

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