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In addition, not all lines have to be collected. If your area of interest is only 4m x 4m, set the
Grid Size to 5m x 5m, but just don't collect the outer lines.
7.3.2
Data collection on the Display Unit
The data collection screen is shown in Figure 7-10. 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 will display the last grid line collected.
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. The system knows the length of each line and will automatically
stop acquisition once that distance has been covered. If the data acquisition ends prior to
reaching the end of the line, or continues noticeably past it, you likely need to do an Odometer
Calibration
(Section
4.2.6).
Once data is collected, the Grid Line will turn red and the system will beep twice. The current
line will now advance to the next one and is shown in white. The remaining lines to be collected
are shown in green.
Move to the start of the next line and repeat the process. The grid image will always display the
line number and the position of your line, relative to your origin. Once all the lines are done in
one direction, it will automatically prompt you to collect lines in the other direction.
Note: Periodically ensure that the line you are collecting matches what is displayed on the
screen. This is especially important as the grid sizes get larger and you may misplace your
position.
Figure 7-10: Grid collection screen prior to any data collection
73
Grid Scan
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