Ground Penetrating Radar (GPR) Maps subsurface structures and artifacts by emitting short, high-frequency radio wave pulses into the ground.  These waves propagate through the ground and interact with different types of materials. When they encounter a boundary between materials with different electrical properties.  Reflected waves are received by the antenna, the strength of the reflection and time it takes for the waves to travel back is recorded.   

Images are created by analyzing the patterns of reflected signals.  GPR can create a cross-sectional image of the subsurface, revealing the location and characteristics of buried objects and features without disturbing the contents!