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Line Scan
6.6.2 Color
Pressing this changes the color palette for the GPR Lines. There are 9 different color palette
options. The image is automatically re-displayed as the color palette changes. A few sample
color palettes are shown in Figure 6-10.
Figure 6-10: Changing Color palettes
6.6.3 Filter
The Filter is a background subtraction filter 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 image, 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 this option if your target is flat.
It works by applying a running-average background subtraction to the data set, defined by the
filter width or a window. This window "moves" across the data and the result is subtracted for
every trace in the data set. The Filter is variable and pressing this button cycles between OFF
and values 1 to 5 (Figure 6-11).
The lower the number, the longer the filter width, and the more "relaxed" the filter. Only the
longer flat-lying features get removed.
The higher the number, the shorter the filter width, and the more "aggressive" the filter. This
results in the removal of long and short flat-lying features.
Pressing OFF turns the filter off completely.
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