Ground Penetrating Radar (GPR)
A ground penetrating radar (GPR) survey is often the only geophysical technique that can be used where cluttered urban conditions prevent other techniques.
Its capacity to work through a wide variety of surface materials from soft landscaping through to hard surfaces such as tarmac and concrete both inside and outside buildings makes it an ideal technique for many archaeological applications. Ground Penetrating Radar is particularly adept at not only mapping buried structures but approximating their depth, providing an all-important extra level of detail.
GPR works by pulsing electromagnetic waves into the ground and measuring the strength and time delay of the returning signal, therefore allowing it to approximate the depth as well as the density of the buried horizon.
Typical locations can range from gardens, courtyards, car parks and derelict land through to floors of churches, basements and graveyards. Structures can also be investigated normally using higher frequency antennas.
Features commonly identified by Archaeological GPR surveys:
- Air Voids – vaults, tombs, tunnels, chambers, cellars
- Structures – Foundations, rubble fill, buried paths
- Ditches – enclosure ditches, moats, trenches
- Discrete features – Hearths, pits, garden features
Introducing SUMO’s new high density GPR surveys
- Improved resolution
- 8 channels of data at 8cm spacing
- 12x better resolution than a standard utility radar survey
- Improved speed and efficiency
- No need to carry out orthogonal transects across the site, saving time and causing less disruption to your site
- Improved data display
- Instant 3D pictures produced on site
- Improved accuracy
- Tracked by a robotic total station or RTK GPS for precise positioning