This is Unit 3, Section 1 of Restoration of Lost Corners by Proportionate
Measurement. A training program developed by the Branch of Cadastral
Survey development of the Bureau of Land Management. In this part
of Unit 3, we should learn the techniques for both two-point and
one-point control of lost corners and how to apply them in possible
The first method of corner restoration which will be consider is
two-point control. The following section describes what it is, where
it is used, and how it is computed.
According to the manual, Section
5-29 defines the technique of two-point control where the intersecting
lines have been established in only two directions. The record distances
to the nearest identified corners on these two lines will control
the position of temporary points. Then from those temporary points,
cardinal offsets will be made to fix the corner point.
A common place where lines intersect with control, in only two
directions, is at the intersection of township and range lines.
An example of this would be the southeast corner of Township 5 North,
Range 4 East.