Ground Penetrating Radar (GPR) is an ultra-wideband imaging technique used for subsurface exploration and monitoring. It is widely used for locating utility lines; monitoring pavement, runways, and walls for soundness and thickness; search and rescue; archaeological exploration; forensic examinations; mining; ice sounding; detecting unexploded land mines and bombs; agricultural applications; groundwater studies; permafrost, void, cave and tunnel detection; location of sinkholes, karst, subsidence areas; and many other similar applications.
The beauty of GPR is that it is non-invasive, relatively inexpensive, and can be used in a variety of ways -- there are hand-held units, downhole units, units that can be dragged behind vehicles, and even used from aircraft and satellite. It has the highest resolution of any subsurface imaging method (sometimes with resolutions of one centimeter), and is far safer than x-ray technology.
http://www.sss-mag.com/gpr.html
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