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

Table 5

Calculation results of the difference in soil depths and scales between the predicted cavity and the identified cavity.

Type	Cavity no.	Soil depth (m)			Longitudinal section (m)			Cross section (m)
		Predicted cavity	Identified cavity	Difference	Predicted cavity	Identified cavity	Difference	Predicted cavity	Identified cavity	Difference
SM	#5	0.63	0.60	0.03	1.45	1.00	0.45	1.50	1.00	0.50
	#12	0.54	0.60	−0.06	1.53	1.00	0.53	1.50	1.00	0.50
	#13	0.84	0.90	−0.06	1.76	1.00	0.76	1.80	1.00	0.80
SP	#1	0.26	0.30	−0.04	0.83	0.50	0.33	0.80	0.50	0.30
	#11	0.32	0.30	0.02	0.86	0.50	0.36	0.90	0.50	0.40
	#6	0.32	0.30	0.02	1.30	1.00	0.30	1.30	1.00	0.30
	#15	0.28	0.30	−0.02	1.22	1.00	0.22	1.30	1.00	0.30
	#2	0.54	0.60	−0.06	1.03	0.50	0.53	1.10	0.50	0.60
	#7	0.64	0.60	0.04	1.59	1.00	0.59	1.60	1.00	0.60
	#16	0.59	0.60	−0.01	1.52	1.00	0.52	1.50	1.00	0.50