Evaluation of the Threshold for an Improved Surface Water Extraction Index Using Optical Remote Sensing Data

Table 1

Result calculation of the local thresholds based on the second-stage split scene image selection in the scene data of the subscene images using the equal interval, quantile, geometrical interval, and natural break approach.

Split scene ID	Threshold value
	Equal interval	Quantile	Geometrical interval	Natural break
AWEI_0	−0.430	0.010	0.016	−0.155
AWEI_1	−0.466	0.040	0.041	−0.160
AWEI_2	−0.577	−0.331	−0.309	−0.184
AWEI_3	−0.447	0.025	0.027	−0.195
AWEI_4	−0.596	−0.007	−0.009	−0.198
AWEI_5	−0.592	0.013	0.013	−0.232
AWEI_6	−0.660	0.008	0.004	−0.216
AWEI_7	−0.508	0.016	0.016	−0.195
AWEI_8	−0.502	−0.018	−0.017	−0.263
AWEI_9	−0.438	0.050	0.033	0.204
AWEI_10	−0.487	0.032	0.030	−0.200
AWEI_11	−0.655	0.012	0.009	−0.241
AWEI_12	−0.600	0.025	0.026	−0.214
AWEI_13	−0.566	−0.058	−0.056	−0.160
AWEI_14	−0.470	−0.009	−0.004	−0.235
AWEI_15	−0.547	0.017	0.018	−0.301
AWEI_16	−0.687	0.045	0.045	−0.196
AWEI_17	−0.798	−0.017	−0.021	−0.211
AWEI_18	−0.641	0.008	0.006	−0.168
AWEI_19	−0.747	−0.042	−0.043	−0.229
Mean	−0.571	−0.009	−0.009	−0.203
Std. Dev	0.105	0.080	0.075	0.029
Minimum	−0.798	−0.331	−0.309	−0.263
Maximum	−0.430	0.050	0.045	−0.155
Mean − Std. Dev	−0.676	−0.089	−0.084	−0.232