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Ground Penetrating Radar (GPR) is technology that is used to locate objects of different density to the surrounding ground. It accomplishes this by transmitting a radar signal into the ground and receiving and interpreting the return signal to establish depth and position.

When there is an object below the surface that has a different density than the surrounding ground it creates an echo that is seen as an inverted parabola shape. GPR images are created as vertical slices plotted along the line of the scan.

To create a 3D model of the underground structures the slices have to be accurately plotted. Before scanning a grid is marked out on the ground at predetermined intervals. Scans are done starting on this grid both vertically and horizontally.

GPR systems can be connected to geodetic Global Positioning Systems (GPS) which is ideal for larger, irregular spaces where marking may be difficult and produce deliverables in aerial images and computer aided drawings.

Some other applications of GPR is in concrete and pavement imaging, mining and agriculture and forestry.

GJS can provide a new outlook on the identification of underground utilities by identification of service depth by means of ground penetrating radar, leakage detection by means of acoustics and thereafter orientation within project area.