Witness Points

Since witness points were ordinarily occupied by the original surveyor and his instrument when set and have a compliment of accessories, they are a pretty reliable source of control when they are found.

A witness point has the same function as a line tree and is used in the same manner to restore lost or obliterated corners. As an existing monument, a witness point is used as a control point in the restoration of lost corners by the appropriate method of proportionate measurement.