Reson SeaBat 7125 SV2, Operator'S Manual

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SYSTEM PERFORMANCE AND DATA TYPES
SeaBat 7125 SV2 Operator‟s Manual
Page 124 July 25, 2011
Version 3
This process is done in stages that begin with the central beams and moving outward on
each side of the wedge in turn.
For instructions on how to display the test results, see Quality in
section 5.7.4 Primary
Display Settings .
Point flagged with Poor colinearity
Line fit
Window extent
Figure 57: Colinearity Flags
7.4.3 Quality Filter
A quality filter makes it possible to not display or export bottom detection points which do
not pass the quality criteria. Enabling the quality filter (see
section 5.7.2.4 Quality Filter )
has the following effects:
The corrected bathymetric data record will only contain the detection points
that pass the quality filtering. A flag will be set in the record to indicate that the
quality filter was applied.
The dedicated snippets record will only contain the detection points that pass
the quality filtering. A flag will be set in the records to indicate that the quality
filter was applied.
The Primary Display wedge and Snippets displays will only show points that
pass the quality filtering.
The options Show Rejected (selected by right-clicking the wedge display) and
Rejected Items (in the drop-down menu on the Primary Display Settings tab)
will be disabled (see Display Points / Filters in
section 5.7.4 Primary Display
Settings ).
For details on settings for the quality filter, see
section 5.7.2 Detection Settings .
7.5 Uncertainty Estimation
The calculation of Total Propagated Error (TPE) is used to aid the surveyor determine
the sounding quality of the bottom detection point. The calculation is done by statistical
methods, typically in the data acquisition software. One of the inputs into the TPE
calculation is the sounding measurement error as computed in the sonar system. Other
error sources include position, draft, squat, load, tide geodetic calculations, lever arms
calculations, timing offsets, speed, heading, attitude, and sound velocity.