In chain surveying, perpendicular offsets are preferred over oblique offsets because:
Choose the correct answer
They are longer than oblique offsets
Perpendicular offsets minimize the error in locating the object; a small error in measuring the offset foot position has minimum effect on the plotted object position
They require a larger chain
They use fewer ranging rods
Correct Answer
B. Perpendicular offsets minimize the error in locating the object; a small error in measuring the offset foot position has minimum effect on the plotted object position
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Perpendicular offset (at right angle to chain line) minimizes position error because the object lies closest to the chain line. Oblique offsets are used when the perpendicular cannot be conveniently measured. Maximum length of offset should not exceed 15 m for 1:1000 scale surveys.
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