Table 4 Accuracy assessment results for 1990, 2000, 2010 and 2020.

	Urban area	Agricultural area	Deep water	Wetland	Forest cover	Bare land	Total (user)	User accuracy (%)
1990
Urban area	75	5	0	0	3	8	91	82
Agricultural area	0	82	0	0	0	0	82	100
Deep water	0	0	56	6	0	0	62	100
Wetland	0	1	0	41	0	0	42	100
Forest cover	0	0	0	0	92	2	94	97
Bare land	0	0	1	0	0	48	49	100
Total (producer)	75	88	57	47	95	58	*420*	98
Producer accuracy (%)	100	93	98	87	97	83
Overall accuracy (%) = 94%			Kappa coefficient = 0.92
2000
Urban area	77	14	0	0	0	0	91	84.6
Agricultural area	0	146	0	0	0	0	146	100
Deep water	0	0	103	0	0	0	103	100
Wetland	0	0	0	83	0	0	83	100
Forest cover	0	0	0	0	87	0	87	100
Bare land	0	0	0	0	0	90	90	100
Total (producer)	77	160	103	83	87	90	*600*
Producer accuracy (%)	100	91	100	100	100	100
Overall accuracy (%) = 97.6%			Kappa coefficient = 0.97
2010
Urban area	169	0	0	0	0	0	169	100
Agricultural area	0	59	0	0	0	0	59	100
Deep water	0	0	103	0	0	0	103	100
Wetland	0	4	0	40	0	0	44	91
Forest cover	0	0	0	0	74	0	74	100
Bare land	0	0	0	0	0	61	61	100
Total (producer)	169	59	103	40	74	61	*510*
Producer accuracy (%)	100	100	100	100	100	100
Overall accuracy (%) = 99%			Kappa coefficient = 0.99
2020
Urban area	81	17	0	0	0	6	104	78
Agricultural area	3	121	0	0	0	0	124	97.6
Deep water	0	0	133	0	0	0	133	100
Wetland	0	1	0	54	0	0	55	98
Forest cover	0	0	0	0	102	1	103	99
Bare land	0	0	0	0	0	180	180	100
Total (producer)	84	139	133	54	102	187	*699*
Producer accuracy (%)	96	87	100	100	100	96
Overall accuracy (%) = 96%			Kappa coefficient = 0.95

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