Spectra Precision Survey Pro v3.80 Recon GPS User Manual - Manual (Page 41)

RTK Data Collection
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Solve Localization
When you start a GPS survey from an autonomous base position, you
need to solve a Localization to adjust GPS measurements into local
coordinates. This is the case for both horizontal projection modes.
Using
Ground - TDS Localization , you need to solve a localization to
relate your arbitrary GPS start point into your non-geodetic local
system. Using a
Mapping Plane , you need to solve a localization to
shift the autonomous GPS start point into accurate geodetic
coordinates.
In either horizontal mode, the procedure is the same. Starting from
an autonomous GPS base setup, you measure GPS positions on
control points with know local plane (N,E) coordinates. The
parameters for a 2D similarity transformation are calculated with a
least squares solution using the control points. These parameters are
added to the zone record (selected map plane zone or default
Localization zone) to create a zone based site record.
Vertical Localizations, with or without a geoid model, uses the same
field procedure. Starting from an autonomous GPS base setup, you
measure GPS positions on control points with know local elevations.
The vertical adjustment parameters are calculated from the control
points. The vertical adjustment will be either a shift to correct geoid
elevations to local elevations, or an inclined plane to correct for
vertical shift and tilts.
Note: If you are starting a new job in Ground - TDS Localization
mode, you do not need control points. Simply set the base on your
first job file point and solve the projection at the prompt. For a more
detailed description of the easiest way to start a new job using Survey
Pro, see the section on One Point Localizations. See Page 48.