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Q: ________is the method of location an offset point from 2 different points on a chain line in such a way that all the three points form a near-equilateral triangle.
  • A. Method of ties
  • B. Swing offset method
  • C. Oblique offset method
  • D. Perpendicular offset method
Correct Answer: Option A - Method of ties–The purpose of a tie line is two-fold, firstly it enables checking of the accuracy of the network and secondary locating the interior details, which are comparatively far away from the main survey line. • Generally, it is a method of locating offset point from two different point on a chain line and all three points form a near equilateral triangle. Oblique offset–When measurements not made at right angles to the survey lines are called tie line offsets or oblique offsets. Perpendicular offset–When perpendicular distance measured from a known points on the main line to the object is called as perpendicular offset.
A. Method of ties–The purpose of a tie line is two-fold, firstly it enables checking of the accuracy of the network and secondary locating the interior details, which are comparatively far away from the main survey line. • Generally, it is a method of locating offset point from two different point on a chain line and all three points form a near equilateral triangle. Oblique offset–When measurements not made at right angles to the survey lines are called tie line offsets or oblique offsets. Perpendicular offset–When perpendicular distance measured from a known points on the main line to the object is called as perpendicular offset.

Explanations:

Method of ties–The purpose of a tie line is two-fold, firstly it enables checking of the accuracy of the network and secondary locating the interior details, which are comparatively far away from the main survey line. • Generally, it is a method of locating offset point from two different point on a chain line and all three points form a near equilateral triangle. Oblique offset–When measurements not made at right angles to the survey lines are called tie line offsets or oblique offsets. Perpendicular offset–When perpendicular distance measured from a known points on the main line to the object is called as perpendicular offset.