One Point Control

Restoring a corner by proportionate measurement should be regarded as the last resort; all other evidence that might reveal the original location must be exhausted first.

Generally, one point control restores a lost corner at record bearing and distance with the possibility of an index correction (when applicable).

An index correction may be applicable where a retracement has been made of many miles of the original lines between identified corners and there has been developed a definite angular or linear pattern of the original survey. It is then proper to make allowance for the average difference.