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Digitally recorded ground penetrating radar (GPR) data resembles reflection seismic data. Both GPR and the reflection seismic method rely on an impulse-type wave signal, whose length in wavelengths varies with the source. Wave packets are sent into the ground by radio-frequency antennas in the case of GPR and by acoustic sources in the case of reflection seismics. The waves are propagated, attenuated and reflected within the studied material.