OR/14/014 Part 1: Survey information
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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. |
Survey area
The following figures (Figure 7) place the survey area in the context of the ONC Chart.
Figure 7: the geographical location as depicted on Google Earth
Figure 8: Survey area over Digital Terrain Map
Figure 9: Survey area over topography (SRTM)
Geographical coordinates systems used
The data is provided in [OSGB 1936] (21m) UK — Great Britain; Isle of Man geographical coordinates system, EPSG code 4277.
Survey boundaries
The following coordinates define the survey boundaries (see Figure 10).
# |
X |
Y |
LATITUDE |
LONGITUDE |
1 |
458320 | 5557292 | 50.09.58.940 | -3.35.00.947 |
2 |
439047 | 5557034 | 50.09.44.579 | -3.51.12.188 |
3 |
421015 | 5569274 | 50.16.13.139 | -4.06.30.058 |
4 |
400371 | 5574101 | 50.18.38.135 | -4.23.57.208 |
5 |
377342 | 5569674 | 50.15.59.238 | -4.43.15.870 |
6 |
377421 | 5563812 | 50.12.49.588 | -4.43.05.057 |
7 |
358031 | 5553650 | 50.07.05.158 | -4.59.09.206 |
8 |
351180 | 5537610 | 49.58.20.110 | -5.04.31.548 |
9 |
340831 | 5532212 | 49.55.15.845 | -5.13.02.698 |
10 |
330857 | 5547499 | 50.03.20.538 | -5.21.46.691 |
11 |
303562 | 5541422 | 49.59.33.816 | -5.44.26.688 |
12 |
303254 | 5564404 | 50.11.56.704 | -5.45.24.728 |
13 |
332029 | 5570398 | 50.15.42.525 | -5.21.24.161 |
14 |
344980 | 5587224 | 50.24.59.650 | -5.10.55.444 |
15 |
351447 | 5592322 | 50.27.50.609 | -5.05.35.248 |
16 |
354291 | 5606491 | 50.35.31.613 | -5.03.31.016 |
17 |
376682 | 5618701 | 50.42.25.304 | -4.44.47.420 |
18 |
386517 | 5629897 | 50.48.34.835 | -4.36.38.626 |
19 |
389247 | 5655149 | 51.02.13.922 | -4.34.46.800 |
20 |
407519 | 5655397 | 51.02.33.582 | -4.19.09.114 |
21 |
410822 | 5675665 | 51.13.31.420 | -4.16.37.605 |
22 |
423879 | 5675843 | 51.13.43.989 | -4.05.24.724 |
23 |
423825 | 5679840 | 51.15.53.328 | -4.05.30.570 |
24 |
456658 | 5680287 | 51.16.20.192 | -3.37.16.756 |
Survey parameters
| Line spacing | : | 200 |
| Tie line spacing | : | 2000 |
| Line direction | : | 0° |
| Tie line direction | : | 90° |
| Total number of lines | : | 776 |
| Total number of tie lines | : | 73 |
| Total line kilometres | : | 54704 |
| Total tie line kilometres | : | 5972 |
| Sensor clearance magnetic | : | ~80 metres |
The survey was flown to a drape surface.
Reflight specificatons
| Parameter | Data Specification |
| Diurnal: | Diurnal variation in excess of 5 nT per 2 minutes |
| Positional: | Line spacing should not exceed 1.25 times and not be less than 0.75 times the nominal line spacing for distances greater than 3.0 km along the flight path |
| Altitude: | In excess of 15 m deviation for 5000 metres or more dependent upon safety |
| On-line magnetic data: | The noise envelope of each sensor will remain below 0.2 nT outside zones where there are a pronounced magnetic gradient. |