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Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF / VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures.
Monitors/measures electrical resistance of soils in restricted volume near surface. Greater resistance: foundations or walls. Reduced resistance: occupation activity. o. GPR - Ground Penetrating Radar. Radar pulses go to ground, reflect back when they strike a feature. Information on depth and three-dimensional shape of buried object/feature