Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 157)

Other Conventional Surveying Tutorials
147
Predetermined Area
The Predetermined Area routine will take a boundary with one open
side and compute the location of a line that will enclose a boundary
with a specified area.
Two methods are available for computing a predetermined area, the
Hinge Method and the Parallel Method. Each method is explained
below.
Hinge Method
The Hinge Method computes the location of a side of a boundary
that has one fixed point. The fixed point acts as a hinge where the
computed side can pivot.
For example, assume you have four points that define an open
boundary and you want to use the Hinge Method to compute the
location of the final side of the boundary so that the entire
boundary encloses a 1/3-acre lot and the fixed point (the location of
the "hinge") is point 4, as shown here. The computed boundary
line will fall somewhere in the gray area when the lot is equal to
1/3 acre.
1. Select Cogo , Predetermined Area from
the Main Menu.
2. In the upper-left corner, enter the desired
area (0.333-acres in this example) and
select the Hinge radio button.
3. Tap the Tap Points button and then tap
the points in the map view in the order that
they occur in the boundary. (You would tap
2, 3, 4 in this example to define the two
fixed boundary sides.)
Note: The boundary can have as many points as you desire, but the
selected points must begin with the starting point of the fixed line
that the hinge line intersect with and end with the hinge point.
3 2
1
4 (hinge)
?