HD-MAX Echo Sounder User Guide
137
previous one.
While performing single station correction, in case that the measuring point
not within the water level information period of the tide station, the software
will pop up a dialog box. If select "Yes", only measuring points within water
level information period will be modified. If select "No", no modification
will be performed. For regional correction, in case that the measuring point
not within the correction area or water level information period of the tide
station, the software will pop up a dialog box. If select "Yes", only measuring
points within water level information period of tide stations will be modified.
If select "No", no modification will be performed.
Attention
: If no sounding sampling process performed for survey line
files, it will not be displayed in survey line files list. During
data correction process, if it is prompted that the measuring
point not within the correction area or water level
information period of the tide station, please check water
level information input and regional correction setup before
performing correction. Generally, it is not permitted to
continue modification forcibly.
Conclusion of This Chapter
At beacon difference or SBAS difference process, since the height location
accuracy of beacon difference or SBAS difference is low, they can not satisfy
the requirements of actual measurement. Thus it is necessary row obtain
water bottom elevation through tide level correction. At RTK surveying,
since RTK elevation positioning accuracy is higher, bottom elevation could
be obtained from surface elevation collected by RTK. Thus it is not necessary
to perform tide level correction. Therefore, tide level correction is not a
necessary item for RTK, but a step that can be ignore. For beacon difference
or SBAS difference process, however, tide level correction is an obligatory
step.
