Sustainable Environment Research

Table 3 Confusion matrix of different water indexes. OT means Optimum Threshold

From: Near infrared band of Landsat 8 as water index: a case study around Cordova and Lapu-Lapu City, Cebu, Philippines

McFeeters [13]	OT = − 0.2592			Feyisa et al. [16] - AWEI_nsh	OT = − 0.2982
Classification	Water	Non-Water	Total	Classification	Water	Non-Water	Total
Water	19,498	1074	20,572	Water	23,244	1592	24,836
Non-Water	4924	30,729	35,653	Non-Water	1178	30,211	31,389
Total	24,422	31,803	56,225	Total	24,422	31,803	56,225
PA [%]	79.8	96.6		PA [%]	95.2	95.0
UA [%]	94.8	86.2		UA [%]	93.6	96.3
OA [%]			89.3	OA [%]			95.1
Kappa hat			0.779	Kappa hat			0.900
Rogers and Kearney [14]	OT = −0.159			Feyisa et al. [16] - AWEI_sh	OT = −0.1905
Classification	Water	Non-Water	Total	Classification	Water	Non-Water	Total
Water	22,132	1655	23,787	Water	24,019	541	24,560
Non-Water	2290	30,148	32,438	Non-Water	403	31,262	31,665
Total	24,422	31,803	56,225	Total	24,422	31,803	56,225
PA [%]	90.6	94.8		PA [%]	98.4	98.3
UA [%]	93.0	92.9		UA [%]	97.8	98.7
OA [%]			93.0	OA [%]			98.3
Kappa hat			0.857	Kappa hat			0.966
Xu [15]	OT = −0.2105			NIR band	OT = 0.128
Classification	Water	Non-Water	Total	Classification	Water	Non-Water	Total
Water	22,206	1134	23,340	Water	24,163	133	24,296
Non-Water	2216	30,669	32,885	Non-Water	259	31,670	31,929
Total	24,422	31,803	56,225	Total	24,422	31,803	56,225
PA [%]	90.9	96.4		PA [%]	98.9	99.6
UA [%]	95.1	93.3		UA [%]	99.5	99.2
OA [%]			94.04	OA [%]			99.3
Kappa hat			0.878	Kappa hat			0.986

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ISSN: 2468-2039

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