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The lateral measurements are taken from the one side of the chain line progressing in a suitable direction. By providing offsets we can locate the objects which can coincide with the main survey line.
Offsets are classified according to the direction and length :-
According to the direction:
1. Perpendicular offsets (angle of the offsets 90°)
2. Oblique offsets(angle of the offsets is not equal to the 90°)
According to the length
1. Short offsets
2. Long offsets
Offset in surveying is a method of measuring distances and angles between points on the ground. It involves measuring the distance and angle from a known point (the benchmark) to the point of interest. The surveyor then records the data and uses it to create a map or plan of the area. Offset is a useful method of surveying when the points of interest are not directly visible from the benchmark.