Visible/Infrared Imager Radiometer Suite (VIIRS)
VIIRS |
Visible/Infrared Imager Radiometer Suite |
Satellites |
NPP, NPOESS 1 to 4 |
Status |
Being developed – To be utilised in the period: 2010 to ~ 2029 |
Mission |
Multi-purpose VIS/IR imagery, including ocean colour |
Instrument type |
22-channel VIS/IR radiometer, including a day/night 0.7 µm channel |
Scanning technique |
Cross-track: 16 parallel lines sampled by 2048 pixel of 800 m s.s.p. and 32 parallel lines sampled by 4096 pixel of 400 m s.s.p.; swath 3000 km. Along-track: one 11.9-km strip of 16 or 32 lines in 1.786 s. |
Coverage/cycle |
Global coverage twice/day (IR) or once/day (VIS) |
Resolution (s.s.p.) |
400 m for five AVHRR-like channels and the VIS day/night channel, 800 m for all other channels. See table |
Resources |
Mass: 252 kg - Power: 186 W - Data rate: 5.9 Mbps |
Channel set and resolution |
Centralwavelength |
Bandwidth or spectral interval |
Radiometric accuracy |
(SNR or NEΔT) |
High or single gain |
Low gain |
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High-quality radiometric channels, resolution 800 m |
412 nm |
20 nm |
352 @ 45 W m-2 sr-1 µm-1 |
316 @ 155 W m-2 sr-1 µm-1 |
445 nm |
18 nm |
380 @ 40 W m-2 sr-1 µm-1 |
409 @ 146 W m-2 sr-1 µm-1 |
|
488 nm |
20 nm |
416 @ 32 W m-2 sr-1 µm-1 |
414 @ 123 W m-2 sr-1 µm-1 |
|
555 nm |
20 nm |
362 @ 21 W m-2 sr-1 µm-1 |
315 @ 90 W m-2 sr-1 µm-1 |
|
672 nm |
20 nm |
242 @ 10 W m-2 sr-1 µm-1 |
360 @ 68 W m-2 sr-1 µm-1 |
|
746 nm |
15 nm |
199 @ 9.6 W m-2 sr-1 µm-1 |
||
865 nm |
39 nm |
215 @ 6.4 W m-2 sr-1 µm-1 |
340 @ 33.4 W m-2 sr-1 µm-1 |
|
1240 nm |
20 nm |
101 @ 5.4 W m-2 sr-1 µm-1 |
||
1378 nm |
15 nm |
83 @ 6.0 W m-2 sr-1 µm-1 |
||
1610 nm |
60 nm |
342 @ 7.3 W m-2 sr-1 µm-1 |
||
2250 nm |
50 nm |
10 @ 0.12 W m-2 sr-1 µm-1 |
||
3.70 µm |
0.18 µm |
0.40 K @ 270 K |
||
4.05 µm |
0.155 µm |
0.11 K @ 300 K |
0.42 K @ 380 K |
|
8.55 µm |
0.30 µm |
0.09 K @ 270 K |
||
10.763 µm |
1.00 µm |
0.07 K @ 300 K |
||
12.013 µm |
0.95 µm |
0.07 K @ 300 K |
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Day/night band, resolution 800 m |
0.7 µm |
0.5 - 0.9 µm |
5 @ 6.70 E-5 |
|
High-resolution imaging channels, resolution 400 m |
0.64 µm |
0.60 - 0.68 µm |
119 @ 22 W m-2 sr-1 µm-1 |
|
0.865 µm |
0.845 - 0.884 µm |
150 @ 25 W m-2 sr-1 µm-1 |
||
1.61 µm |
1.58 - 1.64 µm |
6 @ 7.3 W m-2 sr-1 µm-1 |
||
3.74 µm |
3.55 - 3.93 µm |
2.50 K @ 270 K |
||
11.45 µm |
10.5 - 12.4 µm |
1.50 K @ 210 K |