4 Imaging remains with radar
(a) As the surveyor walks across the site, the radar antenna fires a series of short radar pulses into the ground and records both the time and magnitude of the reflected signals. Due to the conical nature of the radar beam, the buried object (red) will be partially illuminated before and after the surveyor has walked directly over it. (b) The resulting hyperbolic reflections may confuse the interpretation of the data. (c) The data are processed numerically to form a series of "time slices" that reveal a 2-D plan of the buried structure with depth. In this case, the strong reflections (red) show the floor plan of a Roman building.