Spectra Precision Survey Pro v3.80 Recon iPAQ User Manual - Manual (Page 139)

Screen Examples
131
Resection
The Resection screen allows you to occupy an unknown point and
compute its coordinates by shooting two to seven known points.
The accuracy of the computed occupy point depends on the following
factors:
•
The number of known points that are shot
•
The accuracy of the known point’s coordinates
•
The position of the known points relative to the total station
To better explain this last statement, when planning the location of
the total station and the known points that you will shoot, try to
avoid a situation where the horizontal angle turned between two
known points is either near 0° or near 180°. Both of these scenarios
create large errors in the computed point when a small error is made
in measuring the horizontal angle. This is particularly true when
performing a two-point resection.
Performing a Resection
Setup the total station over the location where you want to compute
coordinates. Be sure that at least two known points are
in view from this location. (The known points must
already be stored in the current job.)
1. Tap  6XUYH\ , 5HVHFWLRQ from the Main Menu.
2. Enter the occupy point name that you want to
compute in the
Store Pt field.
3. Enter the number of known points that are in view
that you will shoot in the
Total Resect Points to Shoot
field. You must shoot at least two and no more than
seven.
4. Enter the number of shots (forward and reverse) that
you want to take to each known point in the
Shots
per Resect Point field.