Spectra Precision Survey Pro v4.5 Ranger User Manual - Manual (Page 135)

Other Conventional Surveying Tutorials
125
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 . Survey , Resection .
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