Here's the final plot from a series of resistivity readings taken at our moated site yesterday. The diagram shows a 'pseudo-section' ie a slice down into the ground across a single line, rather than the usual points on a horizontal plane.
The rubble-filled moat is clear to see (the big blue blob at left!) and its size and profile match with our excavations nearby. Being able to detect the former moat in this way should help us to trace its outline and limit the number of exploratory trenches we need to put in.
The higher resistance area at right lies within the area of the building platform and may hint at surviving foundations.
