Geophysical survey May 2019
A Bartington high resolution fluxgate gradiometer was used to map magnetic anomalies in the ground. The technique can identify disturbed soils and features such as ditches, walls and hearths. A Geoscan RM85 resistance meter with probes was used to map ground electrical resistance in parts of the surveyed area.
Problems with the equipment limited the area that could be mapped by resistance but all the selected grids were mapped using the fluxgate gradiometer over Wednesday afternoon, Thursday and Friday morning.
Adrian Maldonado setting up the Bartington fluxgate gradiometer
A baseline was created using 12 canes 20m apart. The areas to be surveyed were gridded using 20m squares built up from the baseline, the locations of grid corners measured by GPS and lines 2m apart laid within each grid to guide the gradiometer.
Team Glasgow – Anouk, Adrian, Scott and Megan planning the survey
Using tapes to accurately position the 20m marker canes
Aerial Image with the Survey Grids Superimposed
Preparing to lay the string lines within a grid
Unravelling string to lay lines within a grid to guide the gradiometer
Deciding on the gradiometer plan
Adrian Maldonado in action with gradiometer
Anouk Busset with the gradiometer in the unrecorded ‘cist’ area
Problems with the resistance meter
Scott driving the resistance meterShow the Map