Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 293)

GPS Module
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Localization with Control Points
Horizontal localization is a simple 2D similarity transformation from
mapping plane coordinates in an intermediate system to coordinates
in your local system. In Ground - TDS Localization mode, the
intermediate system is the default map projection initialized for
ground distances at the base height. In Mapping Plane mode, the
intermediate system is the inaccurate coordinates calculated on the
selected map projection from the autonomous GPS base.
Vertical localization is a correction from measured ellipsoid heights or
geoid elevations calculated from heights, into local elevations. This
correction can be a simple shift or a three-parameter inclined plane.
Localization with Control Points: Summary
Take GPS measurements to at least the minimum number of control
points. In Ground – TDS Localization mode, at least two horizontal
control points are required. In Mapping Plane mode, at least one
horizontal control point is required. In Localization (+Geoid) mode at
least three vertical control points are required when there is no geoid
model, and one vertical control point is required when there is a geoid
model.
1. Tap Solve Localization… to open the Solve Localization wizard.
2. Select the points to use for horizontal and vertical control and
tap Solve>.
3. Verify solution residual or misclosure quality. Tap Next> to
review the parameters and tap Accept to finish setup.
4. Occupy additional local points as check points to verify
solution quality. If desired, additional points can be added as
control points and included in solution.
Note: When you resolve the localization, all of your job file points
will automatically be readjusted using the Adjust with Projection
wizard (Page 311). Therefore, your local coordinates derived from
GPS measurements will always be calculated using the latest
coordinate system solved.