ground penetrating radar

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A method of remote sensing by geophysical survey that can be used to provide a three‐dimensional view of a buried site. The method works by systematically traversing a survey area with a portable radar that is directed downwards into the ground. A short pulse or wave of electromagnetic radiation is transmitted from the system into the ground. A receiver then records the reflected energy returned from interfaces between materials with differing conductivity or dielectric constants. The travel times of the reflections are also recorded and converted into depth measurements to provide a geo‐electric depth section. By piecing together readings from across the survey area its is possible to produce, in visual form, vertically or horizontally sliced cutaways through the subsurface deposits. The reflections detected by the radar relate to changes of material at the interface of deposits and can thus be used to differentiate refilled pits and ditches, graves, buried paths and roads, air‐filled chambers, and wood, metal, and stone artefacts.

Subjects: Archaeology.

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