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A perpendicular distance from a survey line.
Also known as: Perpendicular offset notation, Tie measurement notation
An offset is a distance measured at right angles from a survey line to a feature, recorded with the chainage at which it was taken.
Records a feature's position as a perpendicular distance from a survey line at a stated chainage.
Contexts: Maps
Completes the chainage system into two dimensions, the pair together fixing a point without any instrument beyond a tape.
Contexts: Maps
A short line drawn at right angles from the survey line to the feature, labelled with its length.
A fuller structured visual breakdown is not yet documented for this symbol.