HD-MAX Echo Sounder User Guide
121
Sounding Correction
In the process of measurement, the sounding data at certain measuring points
belong to false depth due to external environment. Therefore, it is necessary
to correct the sounding points at sounding sampling.
Methods to perform
sounding correction: To check if there is any discontinuity exist on the
sounding variable curve. If yes, correct the point based on sounding variation
tendency nearby.
Select the survey line documents to perform sounding sampling in the
"document list". Click [Open], and the system will automatically load the
sounding points data of the survey line, as well as display the fathom curve in
the view area for sounding correction. Two sounding correction methods,
namely manual correction as well as automatic filter wave correction will be
introduced as below.
Manual correction
Click [EditLine]
and the text will change to red. At this moment, the
mouse is under sounding edit status. Drag to correct the fathom curve (blue
line with circle) to perform sounding correction. Click [EditLine] once more
to exist sounding edit status and the texts will recover to white.
If the survey line is double-frequency data, it is default as editing HF
sounding. Click
once more, the button will become to red, it can edit
LF sounding which is the same to the operation mentioned above.
Automatic filtering correction
Set filter mode and filter setting parameters. Click [Process] to perform
automatic filtering correction for current sounding points of survey
documents. The fathom curve is shown as red line with circle. If it is
necessary to display or edit the fathom curve after automatic filtering
correction, please make sure that [Use Auto Data] being clicked.
