As alluded to earlier, the coastal aerosol band and the cirrus cloud band are new to OLI and have no analogous ETM+ bands and will not be considered here. In general, the OLI bands are narrower than the ETM+ bands as the OLI band edges have been refined to avoid atmospheric absorption features. The OLI NIR band is substantially narrower to avoid the water vapor absorption feature at approximately 825 nm. These differences mean that even while both sensors are looking at the same general region of the electromagnetic spectrum at the same time, they may report different values of at-sensor radiance depending on the spectral signature of the target.