BackForwardInstrument:  NAOMI (AlSat) 

Instrument details
Acronym NAOMI (AlSat)
Full name New AstroSat Optical Modular Instrument
Purpose High-resolution land observation, disasters monitoring
Short description 5 VIS/NIR channels including one panchromatic [see detailed characteristics below]
Background Consolidated technology
Scanning Technique Pushbroom. 1750 pixels/line (multispectral channels), 7000 pixels/line (PAN). Swath 17.5 km addressable within a field of regard of 800 km
Resolution 10 m multispectral, 2.5 PAN, at s.s.p.
Coverage / Cycle Global coverage in 4 months. Minimum revisit time for a specific area: 3 days
Mass 18.5 kg Power Data Rate 60 Mbps

 

Providing Agency ASAL
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2010 to ≥2021
Last update: 2017-03-28
Detailed characteristics

Central wavelength

Spectral interval

SNR @ specified albedo

0.485 μm

0.45 - 0.52 μm

….. @ ….. % albedo

 0.565 μm

0.53 - 0.60 μm

….. @ ….. % albedo

0.655 μm

0.62 - 0.69 μm

….. @ ….. % albedo

0.825 μm

0.76 - 0.89 μm

….. @ ….. % albedo

 0.675 μm  (PAN)

0.45 - 0.90 μm

….. @ ….. % albedo

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
Mission objectives
Primary mission objectives
  • Biomass
  • Fraction of Absorbed PAR (FAPAR)
  • Fraction of vegetated land
  • Land cover
  • Leaf Area Index (LAI)
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Tentative Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
VariableRelevance for measuring this variableOperational limitationsExplanation
Fraction of vegetated land2 - very highCloud sensitive.. Daylight only.VIS and NIR channels
Normalised Difference Vegetation Index (NDVI)2 - very highCloud sensitive.. Infrequent coverage.VIS and NIR channels
Aerosol volcanic ash5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS and NIR channels
Aerosol volcanic ash (Total column)5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS and NIR channels
Sea-ice cover5 - marginalCloud sensitive.. Daylight only.VIS and NIR (for contour enhancement) channels
Cloud cover5 - marginalInfrequent coverage.. Daylight only.VIS and NIR channels
Cloud optical depth4 - fairLow-density cloud only.. Infrequent coverage.. Daylight only.VIS and NIR channels
Upward short-wave irradiance at TOA5 - marginalSpectral interpolation needed.. Information on BRDF needed.. Infrequent coverage.VIS and NIR channels
Short-wave cloud reflectance5 - marginalInfrequent coverage.VIS and NIR channels. Unsuitable dynamic range (saturation)
Earth surface albedo5 - marginalCloud sensitive.. Infrequent coverage.VIS channels
Photosynthetically Active Radiation (PAR)4 - fairCloud sensitive.. Infrequent coverage.VIS channels, range undersampled
Fraction of Absorbed PAR (FAPAR)4 - fairCloud sensitive.. Infrequent coverage.VIS channels including Red at 700 nm
Leaf Area Index (LAI)4 - fairCloud sensitive.. Daylight only.. Infrequent coverage.VIS and NIR channels. LAI inferred from NDVI
Vegetation type3 - highCloud sensitive.. Daylight only.VIS and NIR channels
Biomass5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS and NIR channels. Biomass inferred from NDVI
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS and NIR channels. Soil moisture inferred from differential brightness
Fire fractional cover2 - very highCloud sensitive.. Infrequent coverage.. Daylight only.Panchromatic channel with high resolution, for fire boundary detection
Snow cover4 - fairCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and panchromatic (higher resolution) channels
Soil type2 - very highCloud sensitive.. Daylight only.VIS and NIR channels
Land cover2 - very highCloud sensitive.. Daylight only.VIS and NIR channels
Land surface topography5 - marginalCloud sensitive.. Long time for mapping.. Daylight only.VIS and panchromatic channels with cross-track steering capability for stereoscopy between images from neighbour orbits
Glacier cover4 - fairCloud sensitive.. Long time for mapping.. Daylight only.VIS and NIR channels; and panchromatic channel with high resolution, for glacier boundary detection
Glacier topography5 - marginalCloud sensitive.. Long time for mapping.. Daylight only.VIS and panchromatic channels with cross-track steering capability for stereoscopy between images from neighbour orbits
Ice sheet topography5 - marginalCloud sensitive.. Long time for mapping.. Daylight only.VIS and panchromatic channels with cross-track steering capability for stereoscopy between images from neighbouring orbits