GPR offers an accurate, non-destructive, non-invasive solution to mapping the Earth’s shallow subsurface. GPR methods measure the changes in the propagation of radar energy in the ground to produce a high-resolution image of the shallow subsurface conditions. GPR uses high-frequency electromagnetic (radar) energy to acquire subsurface information. A GPR system comprises a control unit, a transmitting and receiving antenna, and a power supply. The transmitting antenna emits radar energy downward into the ground. The radar energy is reflected back to a receiving antenna when the electrical properties of the subsurface change. The reflected signals are recorded to produce a continuous image of the shallow subsurface conditions, which can be viewed in real-time. The antennas are mounted on a cart that is pulled or pushed by hand or vehicle. GPR data is collected digitally and processed to produce high-resolution 2D and 3D images of the subsurface, typically within the upper 20 feet; however, deeper depths are reachable under ideal ground conditions. Cordillera Geo-Services operates GPR hardware and software on a variety of engineering and environmental applications.