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

Table 3

Calculation results of mean difference in the scale of the predicted cavity according to the soil depth of the identified cavity.

Average soil depth of the identified cavity [soil depth range] (m)	Difference in soil depth (m)			Difference in longitudinal section (m)			Difference in cross section (m)
	Minimum	Maximum	Mean	Minimum	Maximum	Mean	Minimum	Maximum	Mean
0.23 [0.11∼0.30]	−0.07	0.01	−0.02	0.00	0.35	0.17	0.00	0.40	0.25
0.37 [0.35∼0.40]	−0.05	0.00	−0.02	0.10	0.30	0.20	0.10	0.60	0.28
0.47 [0.44∼0.51]	−0.09	−0.02	−0.06	0.20	0.60	0.40	0.20	0.40	0.28