Three Keys to Success–Cemetery Mapping

In cemeteries across the United States, there are “the forgotten” burials of unmarked and lost graves. Geophysical techniques, such as Ground Penetrating Radar (GPR), are needed to nondestructively locate these burials in cemeteries and in other locations. Here, we discuss the common causes for lost graves and present three keys to survey success. Three Keys […]

How to Bring out GPR Targets More Clearly Using Gain

When a GPR unit transmits a radar wave into the ground, it gets progressively weaker as the signal is absorbed, or attenuated, by the ground material. The transmitted signal starts off with a given strength, or amplitude, and that amplitude diminishes as it gets deeper into the ground because the signal is getting absorbed by […]

US GPR Suitability Map

Published on the USDA NRCS website (higher resolution maps for individual states can also be found here): Ground-penetrating radar (GPR) is a geophysical method that is often mentioned in news commentaries for its use in locating unmarked graves, clandestine burials and tunnels, terrorism and military hazards, and disaster victims. However, the effectiveness of GPR in these activities […]

Using Simulations to Support GPR Data Interpretation

It can be hard to predict the data that will come out of a GPR inspection, especially when looking for defects and variations in the subsurface. Harder still explaining to the client what you will and have seen, before and after the inspection. A good way to improve the data interpretation, discussion with clients, and […]

Pitfalls of GPR Surveying using GPS

Prior to the elimination of Selective Availability for GPS signals in 2000, the use of GPS tracking for GPR surveys, without the use of costly RTK-DGPS equipment, was essentially impossible due to the large uncertainty in position solutions. As GPS and now multi-constellation GNSS receivers have plummeted in price and complexity, combining GPS and geophysical […]

GPR Processing Basics

Historically, the vast majority of GPR instruments which were used commercially output data which were processed, interpreted, and presented in a report format, regardless of the application. As GPR manufacturers sought to widen acceptance of the technology and appeal to nongeophysicists, the concept of site mark-outs, whereby the GPR is used to mark-out targets in […]