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5.3 Calculating Depth
Ground penetrating radar records the time it takes a radio wave to travel to a target and back; it
does not measure the depth to that target directly. Depth to target is calculated based on the
velocity with which the wave travels to the target and back.
To calculate depth:
Velocity is indicated by the Soil Calibration Value, known as Soil Cal. Once the Soil Cal values
are set, the measured depths will be determined accurately
5.4 Soil Calibration values
Below is a table of common subsurface materials and their corresponding Soil Cal. This is only
a guideline and there is some variation based on the fact that there can be a mixture of different
materials in the subsurface. By far, the soil water content has the biggest influence on Soil Cal
values.
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48
(Section
6.6.5)
GPR Concepts
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