Ground penetrating radar uses radar principles to image, locate
and quantitatively identify changes in electromagnetic properties under the ground.
A ground penetrating radar may operator from the earth's
surface, from an aircraft or satellite or in boreholes.
Information that
can be obtained from ground penetrating radar includes the
depth, orientation, size and shape of buried objects, and the
density and water content of soils.
Ground penetrating radar (GPR)
is also known as earth sounding radar, ground probing radar,
subsurface radar, or georadar.