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8 RTK Mapping
B Tip
Upon beginning a point feature (and setting the antenna height, if
Confirm (Antenna Height) is set to ‘Per feature’), the RTK receiver
automatically enters into static mode. When in static mode, only one
position is logged for a point feature. The position is checked as part
of the static collection technique by comparing it with the positions of
two previous epochs of data (in other words, three epochs in total are
used). If all three epochs of data fall within the precision tolerances
specified, then the position is recorded against the feature and the
position counter in the status bar increases from 0 to 1. The feature
remains open, so the attributes can continue to be collected, until the
feature is ended or canceled.
It is important to minimize antenna movement (or ‘pole wobble’) so
that movement is less than the precision tolerances that have been set.
The finer the precision requirements, the steadier the antenna must be.
Note – Positions logged as static positions ignore the Point feature
logging intervals and Minimum positions settings in the Logging
options form in the Asset Surveyor software.
– Because you need to hold the antenna as steady as possible,
Trimble recommends that the position is recorded before the feature’s
attributes are recorded. Alternatively, logging can be paused before
beginning the feature, then resumed when the position is ready to be
recorded.
If the precision estimate values do not fall within the specified
tolerances, but a position still needs to be logged, press3to
override the tolerances. The position with the best static precision
attained while the feature has been opened is then logged.
Roving data collection
With the exception of point features collected in Static mode, all RTK
positions are collected in Roving mode. This includes positions that
are recorded as Not in Feature.
Note – Point features are always logged in Roving mode if Apply realtime
(Corrections) is set to ‘Automatic’.
198 TSC1 Asset Surveyor Operation Manual