HD-MAX Echo Sounder User Guide
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Manual editing can be further performed for fathom curve after automatic
filtering correction. The manual editing belongs to manual amendment after
automatic filtering correction. Specific editing methods are similar to those
manual sounding correction. Click [Sampling] and the text will change to red.
At this moment, the mouse is under sounding edit status. Drag to correct the
fathom curve (red line with circle) to perform sounding correction.
The commonly used filtering methods of automatic filtering include median
filtering method, weighted average method and statistics method.
Median filtering method: Take the average value of the previous and
posterior N sounding points of a certain sounding point as the sounding value
of the point.
Weighted average method: Calculate the sounding of the previous and
posterior two sounding points of a certain sounding point as the sounding
value of the point according to certain proportion.
Statistics method: Calculate the sounding value after correction according to
principle of statistic as well as depth value varying pattern.
Attention
: The manually corrected fathom curve and those
automatically filter corrected are mutual independent.
When determining to adopt automatic filtering data, please
click [Use Auto Data]. At this moment, the current fathom
curve is as automatically filter corrected one (red line with
circle). Otherwise, do not click [Use Auto Data The current
corrected fathom curve will be as manual corrected fathom
curve (blue line with circle).
Sounding Sampling
Since the original data recorded by the system are more than actual
achievements data, it is necessary to perform sampling according to distance
or marking points. According to normal operation processes, generally,
perform sounding correction at first and then sounding sampling. The
sounding value are corrected one. The following will introduce two sounding
sampling methods, namely automatic sampling and manual sampling.
Automatic sampling
