Table 1.

Confusion matrix of land cover validation based on the areas of interest (AOIs) from very high resolution images of Google Earth and the National Geospatial-Intelligence Agency (NGA) Commercial Archive Data as well as the field photos from the Global Field Photo Library (eomf.ou.edu/photos). Accuracy measures are adjusted with the area of each stratum and presented with a 95% confidence interval (Card, 1982; Olofsson et al., 2013).

Region	Class	Rice	Non-rice	Classif. total	User’s acc.	Producer’s acc.	Overall acc.
NE Asia	Rice	17,536	1460	18,996	0.92 ± 0.004	0.73 ± 0.01	0.98 ± 0.001
	Non-rice	1351	61,637	62,988	0.98 ± 0.001	0.995 ± 0.0002
	Sample total	18,887	63,097	81,984
Japan	Rice	1877	191	2068	0.91 ± 0.01	0.52 ± 0.02	0.97 ± 0.003
	Non-rice	448	15,849	16,297	0.97 ± 0.003	0.997 ± 0.0004
	Sample total	2325	16,040	18,365
NE China	Rice	13,064	1064	14,128	0.93 ± 0.005	0.83 ± 0.01	0.98 ± 0.001
	Non-rice	427	29,434	29,861	0.99 ± 0.001	0.99 ± 0.0003
	Sample total	13,491	30,498	43,989
N Korea	Rice	1409	54	1463	0.96 ± 0.009	0.61 ± 0.03	0.97 ± 0.003
	Non-rice	207	7854	8061	0.97 ± 0.004	0.998 ± 0.0004
	Sample total	1616	7908	9524
S Korea	Rice	1186	151	1337	0.89 ± 0.02	0.50 ± 0.03	0.97 ± 0.004
	Non-rice	269	8500	8769	0.97 ± 0.004	0.996 ± 0.001
	Sample total	1455	8651	10,106