BackForwardInstrument:  OPS (JERS) 

Instrument details
Acronym OPS (JERS)
Full name Optical Sensor
Purpose Very-high-resolution land imagery
Short description 8-channel VIS/NIR/SWIR radiometer [see detailed characteristics below]
Background New development
Scanning Technique Pushbroom, swath 75 km, one channel with fore- viewing (15.33°) for stereoscopy
Resolution 20 m
Coverage / Cycle Global coverage in 1 month, in daylight
Mass 174 kg Power 250 W Data Rate 30 Mbps

 

Providing Agency JAXA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1992 to 1998-10-11
Last update: 2017-03-28
Detailed characteristics

Central wavelength

Spectral interval

SNR @ specified albedo

0.56 µm

0.52-0.60 µm

… @ … % albedo

0.66 µm

0.63-0.69 µm

… @ … % albedo

0.81 µm

0.76-0.86 µm

… @ … % albedo

0.81 µm (fore-pointing)

0.76-0.86 µm

… @ … % albedo

1.65 µm

1.60-1.71 µm

… @ … % albedo

2.07 µm

2.01-2.12 µm

… @ … % albedo

2.19 µm

2.13-2.25 µm

… @ … % albedo

2.33 µm

2.27-2.40 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 vegetated land
  • Land cover
  • Leaf Area Index (LAI)
  • Normalised Difference Vegetation Index (NDVI)
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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
Biomass4 - fairCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Cloud cover5 - marginalInfrequent coverage.. Daylight only.VIS, NIR and SWIR channels
Cloud optical depth4 - fairLow-density cloud only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels
Fraction of vegetated land2 - very highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Glacier cover2 - very highCloud sensitive.. Long time for mapping.. Daylight only.VIS, NIR and SWIR channels, screening ice from clouds
Land cover3 - highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Leaf Area Index (LAI)2 - very highCloud sensitive.. Daylight only.. Infrequent coverage.VIS, NIR and SWIR channels
Normalised Difference Vegetation Index (NDVI)2 - very highCloud sensitive.. Infrequent coverage.VIS and NIR channels
Photosynthetically Active Radiation (PAR)5 - marginalCloud sensitive.. Infrequent coverage.VIS channels, range undersampled
Sea-ice cover4 - fairCloud sensitive.. Daylight only.VIS, NIR (for contour enhancement) and SWIR (for discrimination from clouds) channels
Short-wave cloud reflectance5 - marginalInfrequent coverage.VIS, NIR and SWIR channels. Unsuitable dynamic range (saturation)
Snow cover2 - very highCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels, enabling screening snow from clouds
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels. Soil moisture inferred from differential brightness
Soil type4 - fairCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Upward short-wave irradiance at TOA5 - marginalSpectral interpolation needed.. Information on BRDF needed.. Infrequent coverage.VIS, NIR and SWIR channels
Vegetation type3 - highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Aerosol volcanic ash5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels
Aerosol volcanic ash (Total column)5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels