Spectra Precision Survey Pro v3.80 Recon GPS User Manual - Manual (Page 42)

GPS User’s Manual
38
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 map projection calculated 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
¾ Select horizontal and vertical projection methods on the
Projection card of the Job, Settings screen.
¾ Configure the hardware and set up the base and rover
receivers.
¾
Take GPS measurements to a minimum of two horizontal
control points, and either one vertical control point (to
calculate shift for geoid model) or three vertical control points
(to calculate an inclined plane).
¾ Go to Projection from the Survey menu. Tap 6ROYH
/RFDOL]DWLRQ «
¾ Select the points to use for horizontal and vertical control and
tap
6ROYH!.
¾ Verify solution residual or misclosure quality. Tap 1H[W! to
review the parameters and tap $FFHSW to finish setup.
¾
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.