OR/14/014 Data release

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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.

Figure 5 Total Magnetic Intensity (TMI), IGRF corrected to provide the final TMI anomaly data. Equal-area colour normalisation.
Figure 6 Ternary radiometric image formed from the Potassium (%K), Thorium (eTh) and Uranium (eU) ground concentration estimates.