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Chain surveying - Off-sets
Unit 1- Surveying
Chain surveying
Off-sets
An offset is the lateral 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 from a point on the chain line when the angle of offset is 90º, it is called perpendicular offset or simply offset. When the angle is other than 90º, it is called oblique offset. Another method of locating a point is called the method of “ties” in which the distance of the point is measured from two separate points on the chain line such that the three points form, as nearly as possible an equilateral triangle.
An offset is the lateral 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 from a point on the chain line when the angle of offset is 90º, it is called perpendicular offset or simply offset. When the angle is other than 90º, it is called oblique offset. Another method of locating a point is called the method of “ties” in which the distance of the point is measured from two separate points on the chain line such that the three points form, as nearly as possible an equilateral triangle.
Last modified: Thursday, 28 April 2011, 8:56 AM