OR/14/014 Data release

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.