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. 2019 Nov 11;9:16470. doi: 10.1038/s41598-019-52996-8

Figure 4.

Figure 4

3-D perspective-view GPR results at various depths revealing hidden tracks and volumetric variations including sub-track consolidation. (a) Just beneath the surface (0–5 cm). (b) 5–10 cm of surface clipped. (c) 10–15 cm of surface clipped. (d) A photograph of an excavated human print (left) shown beside a close-up view of the corresponding GPR anomaly (right) at a depth of 5–10 cm, collected prior to excavation.