Spectra Precision Survey Pro v3.80 Recon iPAQ User Manual - Manual (Page 160)

User’s Manual
152
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 and a known direction. The fixed point
acts as a hinge where the computed side can pivot.
For example, assume you have three points that define an open
boundary and a known direction for one side. You can use the
Hinge Method to compute the location of the final side of the
boundary so that the entire boundary encloses a 7-acre lot. The
hinge point in this example is in the upper right corner of the
boundary. The computed boundary line will fall somewhere in the
gray area shown when the lot is equal to 7 acres.
1. Select
&RJR , 3UHGHWHUPLQHG $UHD from the Main
Menu.
2. Tap the first power button and then select the Tap
Points… option. Tap the points in the map view in
the order that they occur in the boundary where the
hinge point is tapped last.
3. Enter the direction of the left side of the boundary in
the last field. In this example, the azimuth is 0.
4. Check the Store Pt 1 checkbox and specify a point
number in the same field if you want the endpoint of
the computed line to be stored.
5. Enter the desired area (7 acres in this example) and
select the
Hinge radio button.
3 2
4 (hinge)
?