Visible and Infra-Red Scanner (VIRS)
VIRS |
Visible and Infra-Red Scanner |
Satellite |
TRMM |
Status |
Operational – Utilised in the period 1997 to ~ 2009 |
Mission |
Multi-purpose VIS/IR imagery |
Instrument type |
5-channel VIS/IR radiometer |
Scanning technique |
Cross-track: 256 pixel of 1.6 km s.s.p., swath 720 km - Along-track: 240 lines/min, 1.7 km/scan |
Coverage/cycle |
Intertropical coverage 1 to 2 times/day depending on latitude (best coverage at 15°N and 15°S) |
Resolution (s.s.p.) |
2.0 km IFOV |
Resources |
Mass: 34.5 kg - Power: 40 W - Data rate: 50 kbps |
Central wavelength |
Spectral interval |
Radiometric accuracy (NEΔT or SNR) |
0.630 µm |
0.58 - 0.68 µm |
9 @ 0.5 % albedo |
1.61 µm |
1.58 - 1.64 µm |
20 @ 0.5 % albedo |
3.74 µm |
3.55 - 3.93 µm |
0.12 K @ 300 K |
10.80 µm |
10.3 - 11.3 µm |
0.12 K @ 300 K |
12.00 µm |
11.5 - 12.5 µm |
0.12 K @ 300 K |