TABLE 1

Comparison Between Reference Standards

	x = SRTM BP_ND, y = SRTM2 BP_ND			x = SRTM BP_ND + 1, y = DVR30–150			x = SRTM2 BP_ND + 1, y = DVR30–150
ROIs	Slope	Intercept	r²	Slope	Intercept	r²	Slope	Intercept	r²
All	1.01	−0.01	0.94	1.00	−0.01	0.97	0.98	0.04	0.99
lROIs	0.74	0.01	0.75	0.80	0.01	0.82	1.01	0	0.95
hROIs	1.13	−0.15	0.86	1.08	−0.08	0.93	0.90	0.12	0.96