The nominal wavelength location of the ETM+ spectral bands and the nominal ETM+ IFOV size and associated ground resolution, for a 705 km satellite altitude, are as shown in Table 3.8. The ETM+ spectral bandwidth is determined by the overall combination of all of the optical elements, the spectral filters, and the detector response. The spectral filters, located immediately in front of each detector array, are the dominant items that establish the optical bandpass for each spectral band. The prime focal plane assembly has a filter housing that contains filters for bands 1 through 4 and the panchromatic band. The cold focal plane assembly has a filter housing that contains filters for band 5, 6, and 7. The spectral filter for the ETM+ are of ion assisted deposition (IAD) design to reduce changes due to outgassing in a vacuum.

 

Table 3.8 ETM+ Spectral Bands, IFOV Size, and Ground Resolution
Spectral Band	Half-Amplitude Bandwidth (µm)	IFOV Size (µm)	Sub-satellite Ground Resolution (m)
Panchromatic	0.520±0.010 - 0.900±0.010	18.5 x 21.3±4.3	13 x 15
1	0.450±0.005 - 0.515±0.005	42.5±4.3	30
2	0.525±0.005 - 0.605±0.005	42.5±4.3	30
3	0.630±0.005 - 0.690±0.005	42.5±4.3	30
4	0.775±0.005 - 0.900±0.005	42.5±4.3	30
5	1.550±0.010 - 1.750±0.010	42.5±4.3	30
6	10.40±0.100 - 12.50±0.100	85.0±9.0	60
7	2.090±0.020 - 2.350±0.020	42.5±4.3	30