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

How deep are these slices? Unfortunately, the software I have access to makes approximating the depth a little tricky. If, however, the leading 3 pieces represent the ploughsoil, which is most likely about 30cm think, I would guess that each piece is about 10cm and we are just coming down about 80cm in overall.

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Luckily for us, most 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 approaches? Contrast of the Earth Resistance data (top left), the magnetometry (bottom left), the 1517ns time piece (leading right) and the 1921ns time slice (bottom left).

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Magnetometry, as talked about above, is a passive technique determining regional variations in magnetism versus a localised zero value. Magnetic vulnerability survey is an active strategy: it is a procedure of how magnetic a sample of sediment might be in the existence of an electromagnetic field. Just how much soil is tested depends on the size of the test coil: it can be really small or it can be fairly big.

The sensing unit in this case is very little and samples a small sample of soil. The Bartington magnetic susceptibility meter with a large "field coil" in usage at Verulamium throughout the course in 2013. Leading soil will be magnetically boosted compared to subsoils merely due to natural oxidation and reduction.

By measuring magnetic vulnerability at a relatively coarse scale, we can identify locations of human occupation and middens. Unfortunately, we do not have access to a reputable mag sus meter, but Jarrod Burks (who helped teach at the course in 2013) has some excellent examples. One of which is the Wildcat website in Ohio.

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These towns are often set out around a central open area or plaza, such as this rebuilt example at Sunwatch, Dayton, Ohio. Sunwatch Village, Dayton, Ohio (picture: Jarrod Burks). At the Wildcat site, the magnetometer survey had located a range of features and houses. The magnetic susceptibility study assisted, however, define the main location of occupation and midden which surrounded the more open location.

Jarrod Burks' magnetic susceptibility survey arises from the Wildcat website, Ohio. Red is high, blue is low. The strategy is therefore of terrific usage in specifying locations of basic profession instead of identifying specific features.

Geophysical surveying is a used branch of geophysics, which uses seismic, gravitational, magnetic, electrical and electro-magnetic physical methodologies at the Earth's surface area to measure the physical homes of the subsurface - Geophysical Survey - Olynthos Project in Wembley Downs Oz 2021. Geophysical surveying methods usually measure these geophysical residential or commercial properties along with anomalies in order to examine different subsurface conditions such as the existence of groundwater, bedrock, minerals, oil and gas, geothermal resources, voids and cavities, and far more.