BackForwardInstrument:  ALI 

Instrument details
Acronym ALI
Full name Advanced Land Imager
Purpose Advanced technology for high-resolution land and vegetation observation
Short description 10 VIS/NIR/SWIR channels, including one panchromatic [see detailed characteristics below]
Background Preparing replacement of the ETM+ flown on Landsat-7
Scanning Technique Pushbroom; 1230 pixel/line (9 narrow-band channels), 3700 pixel/line (PAN); swath 37 km [reduced configuration for demonstration purpose - there should be 5 such arrays, to cover a 185 km swath]
Resolution 30 m (9 narrow-band channels), 10 m (PAN)
Coverage / Cycle Global coverage in 80 days, in daylight [for full configuration it would be 16 days]
Mass 106 kg Power 100 W Data Rate 300 Mbps

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2001 to 2017
Last update: 2022-07-25
Detailed characteristics
Central wavelength Spectral interval SNR @ specified input spectral radiance
443 nm 433 - 453 nm 339 @ 14.8 mW cm-2 sr-1 µm-1
482 nm 450 - 515 nm 572 @ 17.1 mW cm-2 sr-1 µm-1
565 nm 525 - 605 nm 1001 @ 16.1 mW cm-2 sr-1 µm-1
660 nm 630 - 690 nm 1039 @ 13.4 mW cm-2 sr-1 µm-1
790 nm 775 - 805 nm 722 @ 10.4 mW cm-2 sr-1 µm-1
867 nm 845 - 890 nm 710 @ 8.73 mW cm-2 sr-1 µm-1
1250 nm 1200 - 1300 nm 662 @ 4.42 mW cm-2 sr-1 µm-1
1650 nm 1550 - 1750 nm 1040 @ 2.15 mW cm-2 sr-1 µm-1
2215 nm 2080 - 2350 nm 912 @ 0.68 mW cm-2 sr-1 µm-1
Panchromatic 480 - 690 nm 348 @ 15.0 mW cm-2 sr-1 µm-1
Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Instrument classification
  • Earth observation instrument
  • Passive optical radiometer or spectrometer
  • High resolution optical imager
WIGOS Subcomponents
  • Subcomponent 1
  • High-resolution multi-spectral VIS/IR imagers
  • High-resolution multi-spectral VIS/IR imager
Mission objectives
Primary mission objectives
  • Biomass
  • Fraction of Absorbed PAR (FAPAR)
  • Fraction of vegetated land
  • Land cover
  • Leaf Area Index (LAI)
  • Normalised Difference Vegetation Index (NDVI)
  • Vegetation type
Evaluation of Measurements