Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 161)

Other Tutorials
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2. With the prism positioned directly below the location
of the new point, aim the total station at the prism
and tap Shoot Prism .
3. Aim the total station at the new point and tap
Aim Zenith . (Only a zenith angle is measured during
this shot so a prism is not necessary.) A new point
will be stored with the same northing and easting as
the rod location, but with a different elevation.
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.