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Buckinghamshire Council Archaeology Service (BCAS) generic brief for an archaeological geophysical survey

Last updated: 18 August 2021

7. Fieldwork methodology

Accurate and precise surveying is essential and therefore preference is for a cart-based system with automatic RTK GPS logging, although, data collection using handheld gradiometers is also acceptable for magnetometer surveys.

As a minimum it is expected that:

All survey techniques will follow the guidance set out by the CIFA, Historic England, and the European Archaeology Council (EAC)
For handheld magnetometer surveys the standard survey resolution shall be no coarser than 1m x 0.25m (traverse lines 1m apart with data collected every 0.25m). For a cart-based system a higher resolution will be expected
The maximum survey resolution for earth resistance surveys shall be no greater than 1m x 0.5m (traverse lines 1m apart, data collected every 0.5m)
Instruments will be set up carefully to collect highest quality raw data to minimise the need for any post-survey processing
The location of survey grids will be plotted using a GPS system accurate to within ±0.01m relative to the Ordnance Survey National Grid