Downscaling MODIS Surface Reflectance to Improve Water Body Extraction

Table 2

Summary of comparison between MODIS original and downscaled SR estimates and coincident Landsat-7 ETM+ derived SR. Values are represented as percent reflectance (%) for intercept, RMSD, , , and MAE.

Resolution	Indicators	Red	Green	Blue	NIR	SWIR1	SWIR2
250 m	Slope	0.998	0.999	1.019	1.006	1.010	0.977
	Intercept	−0.526	−0.684	−1.533	−0.402	0.985	0.690
		0.974	0.935	0.856	0.978	0.927	0.914
	RMSD	1.661	1.783	2.026	1.862	4.240	3.763
		0.557	0.704	1.319	0.278	1.253	0.326
		1.565	1.638	1.538	1.841	4.051	3.748
	MAE	1.034	1.200	1.525	1.020	2.475	2.137
500 m	Slope	0.981	0.973	0.982	0.986	0.990	0.955
	Intercept	−0.211	−0.284	−1.108	0.036	1.536	1.240
		0.931	0.916	0.830	0.933	0.909	0.898
	RMSD	2.573	1.958	2.080	3.165	4.613	4.047
		0.595	0.721	1.314	0.331	1.259	0.603
		2.503	1.820	1.613	3.148	4.438	4.001
	MAE	1.530	1.300	1.560	1.681	2.728	2.391