A New Approach for Estimating Rock Discontinuity Trace Intensity Based on Rectangular Sampling Windows

Table 2

Estimated intensity and its % error based on circular sampling windows.

Window size (m)/location number	Estimated value (m^−1)		True value (m^−1)		% error of Ie
	Set 1	Set 2	Set 1	Set 2	Set 1	Set 2
20/location 1	0.063	0.125	0.071	0.089	−31.7	−31.5
20/location 2	0.088	0.100	0.114	0.070	11.9	−0.9
20/location 3	0.275	0.100	0.281	0.069	6.7	−57.2
20/location 4	0.213	0.150	0.254	0.143	−43.1	5.3
20/location 5	0.088	0.038	0.092	0.057	52.0	8.3
30/location 1	0.075	0.125	0.063	0.109	−56.1	9.3
30/location 2	0.075	0.108	0.087	0.079	−12.5	17.5
30/location 3	0.233	0.067	0.261	0.075	−1.6	−35.8
30/location 4	0.183	0.108	0.207	0.123	−28.5	4.2
30/location 5	0.075	0.042	0.078	0.050	−31.4	−30.0
40/location 1	0.119	0.106	0.083	0.110	−25.3	−4.2
40/location 2	0.131	0.063	0.109	0.083	−13.6	38.4
40/location 3	0.206	0.100	0.232	0.081	−20.0	−13.8
40/location 4	0.181	0.113	0.187	0.121	−2.8	5.1
40/location 5	0.088	0.075	0.081	0.061	6.1	−14.3
Mean value	0.139	0.095	0.147	0.088	−4.9	7.4
Coefficient of variation	0.482	0.324	0.529	0.299
Range					−56.1 to 52.0	−57.2 to 38.4