|Resolution||Mostly at 2 km flight line separation 400 m in South West England|
|Coverage||Onshore GB and adjacent seas|
|Format||ASCII text records|
The regional aeromagnetic data for Great Britain were acquired by Hunting Geology and Geophysics Ltd and Canadian Aeroservices Ltd between 1955 and 1965.
Most of the surveys have a flight line spacing of 2 km, with 10 km tie-lines. Flight lines for each survey were N–S or E–W, depending on the predominant geological strike and most of the country was flown at 1000 feet (305 m) mean terrain clearance.
The data were recorded in analogue form and reduced to provide hand drawn maps, contoured at 10nT intervals.
Flight line/contour line intercepts were subsequently digitised from these maps by BGS to produce the digital aeromagnetic data set for the UK, comprising over 540 000 points.
The data have been reprocessed to refer anomalies to a variant of IGRF-90, which makes allowance for the inaccurate prediction of the geomagnetic field model prior to 1971.
Contact Digital Data for more information.