| Overview
Global Imager(GLI) is an optical sensor aiming at observing globally and so frequently the reflected solar radiation from the earth's surface including land and ocean, and cloud or the infrared radiation for measuring the physical content such as chlorophyll, dissolved organic substance, surface temperature, vegetation distribution, vegetation biomass, distribution of snow and ice, and albedo of snow and ice, etc. These data may be used for grasping the global circulation of carbon, monitoring cloud, snow, ice, and sea surface temperature, and grasping the primary marine production. GLI is an advanced type of the mission of Ocean Color and Temperature Scanner (OCTS) on-board ADEOS for further expansion of observation.
GLI has 23 bands in visible and near-infrared region (VNIR), 6 bands in short-wave length infrared region (SWIR), and 7 bands in middle and thermal infrared region for its multispectral observation. Although the ground resolution is at the nadir of 1km, a part of the bands in VNIR and SWIR has a resolution of 250 m at the nadir which will be used for observing vegetation and cloud. The observation region by mechanically scanning is 12 picture elements (12 km) to the forward direction and 1600 km in the cross-track direction.
Characteristics
| Spectral Range |
0.375 - 12.5mm |
| Number of Special Bands |
36 |
| Spectral Bandwidth |
10nm(VNIR/1km) |
| Instantaneous Field of View(IFOV) |
1.25mrad & 312.5mrad
(1km & 250m nadir) |
| Scanning Angle |
±45°(Ground Surface 1600km) |
| S/N,NEDT |
800,0.1K(1.25mrad IFOV bands) |
| Quantization |
12bits |
| MTF |
0.35 |
| Polarization Sensitivity |
Under 2% |
| Tilting Angle |
-20°,0°, +20° |
Coarse Data Transmission
(DTL:Direct Transmission for Local user) |
4Band(443nm,565nm,667nm,11.95mm) |
|
