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Much of the image includes blank locations now with little or no radar action. The "courtyard" wall is still showing strongly, however, and there are continuing recommendations of a difficult surface in the SE corner. Time slice from 23 to 25ns. This last slice is now practically all blank, however a few of the walls are still showing strongly.

How deep are these pieces? The software application I have access to makes approximating the depth a little challenging. If, however, the leading three pieces represent the ploughsoil, which is probably about 30cm think, I would guess that each piece has to do with 10cm and we are just coming down about 80cm in overall.

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Luckily for us, many of the websites we have an interest in lie just below the plough zone, so it'll do! How does this compare to the other techniques? Contrast of the Earth Resistance data (leading left), the magnetometry (bottom left), the 1517ns time piece (top right) and the 1921ns time piece (bottom left).

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Magnetometry, as talked about above, is a passive technique determining regional variations in magnetism against a localised no value. Magnetic vulnerability survey is an active technique: it is a step of how magnetic a sample of sediment could be in the presence of a magnetic field. How much soil is tested depends upon the size of the test coil: it can be extremely little or it can be fairly big.

The sensor in this case is very little and samples a tiny sample of soil. The Bartington magnetic vulnerability meter with a big "field coil" in use at Verulamium during the course in 2013. Leading soil will be magnetically improved compared to subsoils simply due to natural oxidation and decrease.

By determining magnetic susceptibility at a relatively coarse scale, we can identify locations of human occupation and middens. We do not have access to a trusted mag sus meter, however Jarrod Burks (who helped teach at the course in 2013) has some excellent examples. One of which is the Wildcat site in Ohio.

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These towns are frequently laid out around a main open area or plaza, such as this reconstructed example at Sunwatch, Dayton, Ohio. The magnetic susceptibility survey assisted, however, specify the primary location of occupation and midden which surrounded the more open area.

Jarrod Burks' magnetic susceptibility study results from the Wildcat site, Ohio. Red is high, blue is low. The technique is therefore of great usage in specifying areas of basic occupation instead of identifying particular functions.

Geophysical surveying is a used branch of geophysics, which uses seismic, gravitational, magnetic, electrical and electromagnetic physical methodologies at the Earth's surface area to measure the physical homes of the subsurface - Geophysical Survey - Durham University in Balcatta Oz 2022. Geophysical surveying approaches typically measure these geophysical homes in addition to anomalies in order to examine different subsurface conditions such as the presence of groundwater, bedrock, minerals, oil and gas, geothermal resources, spaces and cavities, and a lot more.