A Method for Cavity Scale Estimation Based on Ground-Penetrating Radar (GPR) Explorations: An Experimental Study

Table 4

Calculation results of the difference in scales between the predicted cavity and the identified cavity according to the soil depth.

Analyzed cavities	Soil depth (m)	Identified cavity (m)		Difference of predicted and identified values (m)		Cidentified/Cpredicted (%)
		Longitudinal section	Cross section	Longitudinal section	Cross section	Longitudinal section	Cross section
Cavity 1	0.11	1.00	0.90	0.30	0.30	76.9	75.0
Cavity 2	0.24	0.50	0.40	0.35	0.40	58.8	50.0
Cavity 3	0.27	1.50	1.20	0.00	0.00	100.0	100.0
Cavity 4	0.30	1.60	0.50	0.00	0.30	100.0	62.5
Cavity 5	0.35	1.00	0.50	0.30	0.10	76.9	83.3
Cavity 6	0.36	1.60	2.10	0.10	0.60	94.1	77.8
Cavity 7	0.40	1.20	0.65	0.20	0.15	85.7	81.3
Cavity 8	0.44	0.70	1.40	0.60	0.20	53.8	87.5
Cavity 9	0.46	1.80	0.40	0.20	0.40	90.0	50.0
Cavity 10	0.51	1.00	0.95	0.40	0.25	71.4	79.2