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Q: In chain surveying, offsets are
  • A. lateral measurements made with respect to main survey lines
  • B. only perpendicular erected from chain lines
  • C. taken to avoid unnecessary walking between stations
  • D. measurements which are not made at right angles to the chain line
Correct Answer: Option A - Offsets– An offset is the distance of an object or ground feature measured from a survey line. By method of offsets, the point or object is located by measurement of a distance and angle (usually 90⁰) from a point on the chain line, when the angle of offset is 90⁰, it is called perpendicular offset or sometimes, simply offset and when the angle is other than 90⁰, it is called an oblique offset.
A. Offsets– An offset is the distance of an object or ground feature measured from a survey line. By method of offsets, the point or object is located by measurement of a distance and angle (usually 90⁰) from a point on the chain line, when the angle of offset is 90⁰, it is called perpendicular offset or sometimes, simply offset and when the angle is other than 90⁰, it is called an oblique offset.

Explanations:

Offsets– An offset is the distance of an object or ground feature measured from a survey line. By method of offsets, the point or object is located by measurement of a distance and angle (usually 90⁰) from a point on the chain line, when the angle of offset is 90⁰, it is called perpendicular offset or sometimes, simply offset and when the angle is other than 90⁰, it is called an oblique offset.