Civil Engineering :: Surveying
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The operation of resection involves the following steps
- rough orientation of the plane table
- the three lines form a triangle of error
- drawing lines back through the three control points
- select a point in the triangle of error such that each ray is equally rotated either clockwise or anti clockwise
- the points obtained by three rays is the correct location.
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The ratio of the length of long chord and the tangent length of a circular curve of radius R deflecting through angle Δ, is
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To avoid large centering error with very short legs, observations are generally made
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During secular variation of magnetic meridian at different places
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Designation of a curve is made by
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If a linear traverse follows a sharp curve round a large lake where it is difficult to have long legs, the accuracy of the traverse may be improved by
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Perpendicular offset from a tangent to the junction of a transition curve and circular curve is equal to
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Rankine's deflection angle in minutes is obtained by multiplying the length of the chord by
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The approximate formula for radial or perpendicular offsets from the tangent, is
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The line of collimation method of reduction of levels, does not provide a check on
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