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6.6 Line Scan menu options
All the settings described below change the way the data is viewed on the screen. They do not
alter the saved data in any way. These settings can be changed while you are still collecting
data, after you have pressed Stop, or when viewing a previously saved line.
6.6.1 Zoom
This button controls the horizontal and vertical scaling of the displayed GPR data. Pressing the
Zoom button changes the buttons on the bottom menu, which are explained below:
•
Depth – Pressing + and - under the Depth button allows you to change the display
depth of the data. This is commonly referred to as the depth window. The pre-set
values range from 0.5m to 2m (2' to 8'), see Figure 6-8.
If the data was collected with a shallower depth, the depth setting can still be increased
after the fact, when reviewing the data. In general, it's a good idea to set your displayed
depth to 1.5 - 2 times the depth you expect the deepest target to be.
•
Position – Pressing + and - under the Position button allows you to change the length
of data display on a single screen. This is also known as horizontal scaling. The pre-set
values range from 5m to 30m (10' to 75'), see Figure 6-9.
One reason for setting this to 30m would be to fit more data on the screen and look for
anomalies relative to the surrounding soil.
Figure 6-7: Inserting Flags
57
Line Scan
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