Site Assessment of Multiple-Sensor Approaches for Buried Utility Detection

Figure 15

GPR results (250 MHz) from initial survey: (a) hyperbola returned when directly over the pipe, (b) plan view of the GPR survey (averaged at depth slices where the hyperbolae are prominent), and (c) the LFEM survey (overlaid onto the GPS positions within the predefined area), where a brighter region represents higher anomalous measurement.

(a)

(b)

(c)