Medium Resolution Spectral Imager (MERSI)
MERSI |
Medium Resolution Spectral Imager |
Satellites |
FY-3 A to G |
Status |
Operational – Utilised in the period: 2008 to ~ 2024 |
Mission |
Vegetation indexes and ocean colour |
Instrument type |
20-channel radiometer, 19 narrow-bandwidth in VIR/NIR/SWIR and one broadband in the Thermal IR |
Scanning technique |
Cross-track: 2048 (8192) pixels of 1 km (250 m) ssp, swath 2900 km - Along-track: ten 10-km lines every 1.5 s |
Coverage/cycle |
Global coverage in 1 day (in daylight) |
Resolution (s.s.p.) |
250 m for broad-band channels, 1.0 km for narrow-band channels |
Resources |
Mass: … kg - Power: … W - Data rate: … Mbps |
Channel set |
Central wavelength |
Spectral range or Bandwidth |
Radiometric accuracy (NEΔT or NEΔρ) |
Broad-band channels with 250 m resolution, mostly for clouds, vegetation and surface temperature |
0.470 µm |
0.445 - 0.495 µm |
0.45 % |
0.550 µm |
0.525 - 0.575 µm |
0.4 % |
|
0.650 µm |
0.625 - 0.675 µm |
0.3 % |
|
0.865 µm |
0.840 - 0.890 µm |
0.3 % |
|
11.250 µm |
10.0 - 12.5 µm |
0.3 K @ 300 K |
|
Narrow-band channels with 1000 m resolution, for ocean colour, vegetation, aerosol |
412 nm |
20 nm |
0.1 % |
443 nm |
20 nm |
0.1 % |
|
490 nm |
20 nm |
0.05 % |
|
520 nm |
20 nm |
0.05 % |
|
565 nm |
20 nm |
0.05 % |
|
650 nm |
20 nm |
0.05 % |
|
685 nm |
20 nm |
0.05 % |
|
765 nm |
20 nm |
0.05 % |
|
865 nm |
20 nm |
0.05 % |
|
905 nm |
20 nm |
0.10 % |
|
940 nm |
20 nm |
0.10 % |
|
980 nm |
20 nm |
0.10 % |
|
1030 nm |
20 nm |
0.10 % |
|
1640 nm |
50 nm |
0.05 % |
|
2130 nm |
50 nm |
0.05 % |