TerraDat has many years’ experience mapping shallow archaeology using geophysical techniques.

Our work has led to the unearthing of several significant finds including Welsh Princes, notable Roman mosaics, entire forgotten settlements. We have appeared on Channel 4 Time Team, BBC Documentaries and contriubuted to changing community perception about the past on Lottery-funded heritage projects.

TerraDat’s archaeological capability has significantly increased due to the use of a specialist magnetic gradiometry carrier system. This system utilises eight Foerster FEREX CON 650 gradiometer probes mounted on a bespoke Sensys rig. Real-time, sub-centimetre accurate positioning is provided by a Trimble 5700 RTK GPS. The rig is towed across the survey area behind a 4×4 vehicle or ATV acquiring swaths of data up to 3.5m wide. The probes are spaced at 0.5m intervals, giving twice the resolution of a conventional gradiometry survey.

In optimum field conditions the new system allows acquisition rates of up to 40 hectares a day significantly reducing survey costs and time over a conventional walked survey. As one of Europe’s leading environmental geophysical contractors TerraDat’s enhanced processing and interpretation capabilities allow datasets to be further interrogated to provide information on a variety of site hazards such as shallow UXO, mine workings and buried structures and services.


Up to 40 hectares a day

Full geophysical and archaeological interpretation

Twice the resolution of a conventional gradiometry survey

Survey results provided in CAD/GIS formats