Following a previous geophysics training session on 9th April, Bill and Mark returned to the site to survey three adjacent grid squares. A preliminary set of plots for all four squares is shown below, with each plot showing a different way to visualise the data:
The grid square surveyed initially (D21) is to the bottom left of the group of four squares. It’s a bit hard to see any detail on the different representations above, so I have added an extract below:
A few things to note on the plots.
1. The square to the bottom right (D22) does not appear to conform to the pattern of colours shown by the other three squares. This is probably because the geophysics meter was calibrated with a very different start reading compared with the other squares, and it should be possible to re-scale the values to fit with the other squares.
2. The square to the top right (E22) has a clear vertical discontinuity in readings. This is because the meter had to be re-calibrated at this point due to the reading dropping too low. Again, it should be possible to apply a scaling factor and adjust this.
3. Looking at the top two plots, there is a clear linear feature in the top left square (E21) from approximately (0,20) to (4,26).
It will be interesting to see whether further processing of the data can tease out any other patterns :-).