13-Survey & Map Mode
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13.2.4.1 Depth Lines
Depth lines are horizontal lines indicating the estimated depth. They are very useful for getting
depth estimates to features of interest in the data.
The Depth Lines are controlled by the current velocity value as well as the depth selected. See
13.3.1.1: p.94
on changing the depth setting and for more details on how depths are determined.
To display the correct depth, it is the responsibility of the user to calibrate the system to
the correct velocity of the material (see 13.2.10: p.88 on how to calibrate the system for
velocity). Once a velocity value has been determined see 13.3.1.2: p.95 on how to change
the velocity setting.
Note that it is possible to change the depth units between meters and feet (
13.3.1.7: p.97
).
13.2.4.2 Fiducial Markers
A fiducial marker is a dotted vertical line placed on the data section at a specific position during
data acquisition. Adding these markers during data acquisition is useful for recording significant
positions or the positions of surface objects encountered during the survey.
A fiducial marker is activated by pressing the A button on the keypad during data acquisition. As
well, when using the backup arrow (
13.2.7: p.82
) fiducial markers can be added at the current
arrow location by pressing the A button.
The position and name of the object encountered at each marker can be recorded in a field
notebook. The fiducial marker is written to the trace header of the next trace to be collected.
Fiducial markers are numbered sequentially (F1, F2 etc.). When the data are transferred to a PC
and reviewed, these markers can assist with data interpretation.
If a GPS receiver is attached to the DVL, a file containing GPS information can be saved. In
Fiducial Tagging mode, whenever a fiducial marker is added to the data, a line of GPS
information will be added to the GPS file (
13.3.5: p.112
)
13.2.5 Menu
The bottom section contains the user menu selection and current program settings. From left to
right on the screen, this includes:
1)
The current position based on the current triggering device (
13.3.2.2: p.98
) and
Station Interval (
13.3.3.3: p.103
). The current position also changes when the
Backup Arrow is used (
13.2.7.1: p.83
)
2)
The total number of traces collected. Beside this is the Skipped Traces Number
which indicates when the system is being moved too fast (
13.2.7: p.82
)
3)
GPS information (if GPS receiver attached, see
13.2.5.1: p.81
and
13.3.5: p.112
),
4)
The Calib button for calibrating the velocity setting (
13.2.10: p.88
).
5)
The Gain button and current Gain setting (
13.2.6: p.81
),
6)
The Filter button and current Filter setting (
13.2.12: p.93
),
7)
The Stop button and the total depth to the bottom of the data image (
13.3.1: p.94
),
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