4.4.5 Usig the GPR Tab

4.4.5 Usig the GPR Tab
The GPR Tab in the Survey Tool is used for slicing GPR data. GPR data are processed and compiled into 3D tiles using the GPR Loader (accessed from the Survey Tool whenever GPR file formats are selected), and then are sliced in the Survey Tool using the GPR Tab. GPR 3D tiles are retained so GPR surveys can be re-sliced at any time using this part of the Survey Tool. Each slice is a band in the associated GPR survey.

Add a Slice

1. Add a Slice
Click the Add button to add single GPR slice to the slice list. A new slice will be added to the slice list and you will need to enter the slice interval (upper and lower limits) in the selected slice units.

Auto Slice

2. Auto Slice
Click Auto to enter parameters to generate a series of equally thick slices, using the selected slice units (meters or nanoseconds). Enter the time or depth range, followed by the number of slices and slice thickness. In the example below, the interval from 0 to 28 ns is sliced into 7 4-ns thick slices.

Slice Units

3. Slice Units
Slices can be based on time in nanoseconds, or depth in meters. For the latter to work properly, depth should have been calculated during processing in the GPR Loader.

Slice Method

4. Slice Method
Select from the following slice methods:
  1. sq - squared amplitudes (works well for most data)
  2. max - maximum amplitude in the slice interval (also works well)
  3. avg - average amplitude (this does NOT work well for most data)

Slice List

5. Slice List
The main portion of the GPR Tab is a list of slices. Each one can be selected using the radio button on the left, and will be displayed in the Assembler. Be patient as you switch between viewing different slices. Sometimes loading them takes a long time because GPR data are so high resolution. The slice interval can be edited for each slice and they do not have to be equal (although they all must use the same slice units).
Click the large "X" button  on the right-hand side of the slice to remove it from the list and the survey.
Last Updated June 15, 2011