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7.1.2
Grid Size
Press the + and - buttons under Grid Size at the bottom of the screen to change the dimensions
of the grid. Alternatively, you can press the + and - buttons on the screen beside Grid Size on
the upper part of the screen.
In metric units, the available grid sizes are 3m x 3m, 5m x 5m, 10m x 10m and 15m x 15m.
In US standard units, the available grid sizes are 10ft x 10ft, 20ft x 20ft, 30ft x 30ft, 40ft x 40ft,
7.1.3
Grid Resolution
Grid resolution determines the spacing between grid lines. This can be varied by pressing the +
and - buttons under Grid Resolution at the bottom of the screen. Alternatively, you can press
the + and - buttons on the screen beside Grid Resolution on the upper part of the screen.
Available options are 0.1m. 0,2m, 0.25m, 0.5m in metric units and 4 inches, 6 inches, 1.0ft, 2.0
ft in US standard units. The best images will result when the finest grid resolution value is used.
Note that due to size processing limitations, the largest grid size will not work with the finest
resolution. A message will be displayed as shown in Figure 7-4, and you will not be able to
enter the grid.
Figure 7-4: Message indicating grid size and resolution are not compatible
Calculating Resolution
The size of target will determine line spacing. The system must pass over a target to detect it;
line spacing needs to be on the order of the size of the target or smaller when practical. This
can be adjusted to a larger spacing for larger targets or targets that are linear. As well, these
rules may have to be bent for practical purposes such as survey production rates. Tighter line
spacing takes longer to collect and may not be economically possible in all circumstances.
69
Grid Scan
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