Beamish D and White J. 2014. TellusSW: airborne geophysical data and processing report . British Geological Survey Internal Report, OR/14/014.
The contractor delivered data are to be released, in simplified form, as ASCII comma-separated value (.csv) files. The data format of these files are shown in Tables 2 (Magnetic) and 3 (Radiometric), below.
Table 2 Contents of ASCII file Magnetic data
Channel
Description
Units
X_BNG
Easting (X) BNG (OSGB 1936)
m
Y_BNG
Northing (Y) BNG (OSGB 1936)
m
Lat
Latitude in WGS84
m ddd.mm.ss.ss
Lon
Longitude in WGS84
ddd.mm.ss.ss
flight
Survey flight number
date
Survey flight date
yyyy/mm/dd
Line
Line number
Igrf
International Geomagnetic Reference Field
nT
altimeter
Radar altimeter height from surface
m
processed_horizontal_gradient
Measured Horizontal Gradient (processed)
nT/m
levelled_mag
Total Magnetic Intensity (Levelled)
nT
levelled_mag_igrf_corrected
Residual Magnetic Intensity (Levelled)
nT
Table 3 Contents of ASCII file Radiometric data
Channel
Description
Units
X_BNG
Easting (X) BNG (OSGB 1936)
m
Y_BNG
Northing (Y) BNG (OSGB 1936)
m
flight
Survey flight number
date
Survey flight date
yyyy/mm/dd
Line
Line number
altimeter
Radar altimeter height from surface
m
processed_total_count
Final corrected total count
cps
processed_potassium
Final corrected potassium
%K
processed_uranium
Final corrected uranium
ppm (eU)
processed_thorium
Final corrected thorium
Ppm (eTh)
Additionally, gridded and georeferenced images of standard geophysical derived parameters are also available. These will be released for download via a BGS TellusSW data portal in the near future. Two of the standard images of the data are shown below.