Spectra Precision Survey Pro v3.80 Recon GPS User Manual - Manual (Page 50)

GPS User’s Manual
46
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Geometry of control points: the control points should be
distributed evenly surrounding the survey area.
•
Check points: after solving for localization parameters with a
minimum number of control points, you should occupy an
independent checkpoint to verify the solution quality. If you
desire, this point can be added as a control point and used for
subsequent solutions. If the checkpoint measurement is within
the tolerance, this step should not be necessary.
•
Redundancy and residuals: After solving localization parameters
with more than the minimum number of control points, you
should examine the solution residuals. The residuals should be
close to the measurement precision of your instrument and the
control points.
Fig. 10: Good Control Point
Geometry
Three control points surround the
project area.
Fig. 11: Poor Control Point
Geometry
Three control points in one corner of
the project area. Also, for vertical
localization, the three control points
are close to co-linear.