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Figure 4-35: Trigger button appears only if Trigger mode is set to Manual
View Settings
Basic settings can be set to control how data is displayed. These can be set prior to data
collection and changed during data collection. Note that if changed during collection, the new
settings will only take effect from that point on. That is, they are not retroactively applied to the
data already collected.
•
Dewow – turning dewow ON applies a high pass filter to suppress the low frequency
"wow" in the data.
•
Background Subtraction – a background subtraction filter is used for removing flat-lying
responses in the data. Filtering helps identify shallow targets that might be masked by
the strong signals at the top of the section, as well as possibly enhancing the visibility of
hyperbolas further down in the data. However, it will also filter out other flat-lying
responses, such as soil boundaries, so be careful when using the filter option if your
target is flat. Move the slider bar to the right to turn ON the background subtraction filter.
•
Gain Level - Since the material being scanned absorbs the GPR signal, deeper targets
return weaker signals. Gain acts like an audio volume control, amplifying signals and
making deeper targets appear stronger in the image. Gain values vary from 0 to 9 where
0 means no amplification has been applied and 10 means that maximum amplification
has been applied. As the slider bar is moved, the gain level will be displayed above the
bar.
GPS Signal Strength
This window displays the strength of the GPS signal, which is a function of how many satellites
it is seeing. The bars are coloured in green.
The Quality describes the type of fix the GPS is obtaining (e.g., DGPS, RTK).
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SPIDAR Software
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