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Collecting Data
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Not all lines have to be finished; if there is an obstruction preventing you from finishing the line,
you can simply press
Stop and end the line early. Do not try to steer the system around the
obstruction, as this will throw off the positioning of the data. You can also collect a line from the
other direction into the obstruction; this is explained in
Section 7.2.10.
In addition, not all lines have to be collected. Use the 4-way directional keypad to advance to
the next line you are able to collect.
7.2.7 Data collection on the DVL
The data collection screen is shown in Figure 7-36. The right half of the screen is a graphic
representation of the grid, illustrating the size of the grid and the lines that need to be collected.
The left half of the screen initially displays some parameters related to the grid.
Figure 7-36: Grid collection screen prior to any data collection
Press
Start when you are positioned at the start of the line. Push the system in a straight line
towards the end of the line (Figure 7-37). If Grid Line Stop (5.1.10) is set to Auto, the system
will automatically stop acquisition once that distance has been covered. If Grid Line Stop is set
to Manual, you will have to manually press End Line when you are done. You can collect up to
a maximum of 50% beyond the normal line length. For example, if the grid is 20m x 20m, and
Grid Line Stop is set to Manual, the user can collect any line up to 30m long. Sometimes you
might want to collect a little more data if there is an interesting feature at the end of your line.
As you are collecting a line, you must move in a forward direction. If you back up more than two
step sizes during collection, it will stop the line.