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