Table 1 Confusion matrix for the water extraction accuracy evaluation using different methods on September 8^th, 2000, September 13^th, 2008 and September 17^th, 2015.

Date	Method	O.A. (%)	Kappa Coefficient	P.A. (%)	U.A. (%)	Commission (%)	Omission (%)
September 7^th, 2000	MLC	97.74	0.95	94.93	95.46	2.54	1.07
September 7^th, 2000	NDWI	98.85	0.98	96.37	95.89	1.07	0.76
September 13^th, 2008	MLC	98.83	0.97	96.54	97.35	1.45	0.76
September 13^th, 2008	NDWI	99.17	0.99	97.31	96.68	0.83	0.46
September 17^th, 2015	MLC	99.25	0.99	98.72	98.64	0.62	0.35
September 17^th, 2015	NDWI	99.84	0.99	99.53	99.68	0.22	0.17

Note: O.A. means overall accuracy; P.A. means producer′s accuracy; and U.A. means user's accuracy.

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