BackForwardInstrument:  RSI (FORMOSAT-5) 

Instrument details
Acronym RSI (FORMOSAT-5)
Full name Remote Sensing Instrument
Purpose High-resolution land observation for vegetation and disasters monitoring
Short description 4 channels in the VNIR range, and one panchromatic [see detailed characteristics below]
Background Improved after the RSI flown on FORMOSAT-2 (higher resolution)
Scanning Technique Pushbroom. Swath 24 km, addressable along-track and across-track within a Field-of-Regard of 500 km
Resolution PAN: 2 m; all other channels 4 m at s.s.p.
Coverage / Cycle Near-global in 3 months; by strategic pointing every other day
Mass Power Data Rate

 

Providing Agency NSPO
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2017-11-23 to ≥2022
Last update: 2017-08-02
Detailed characteristics
Central wavelength Spectral interval SNR @ specified albedo
0.485 μm 0.45 - 0.52 μm ……... @ ……. % albedo
0.560 μm 0.52 - 0.60 μm ……... @ ……. % albedo
0.660 μm 0.63 - 0.69 μm ……... @ ……. % albedo
0.830 μm 0.76 - 0.90 μm ……... @ ……. % albedo
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
Glacier cover3 - highCloud sensitive.. Long time for mapping.. Daylight only.VIS and NIR channels; and panchromatic channel with high resolution, for glacier boundary detection
Glacier topography3 - highCloud sensitive.. Long time for mapping.. Daylight only.VIS and panchromatic channels with cross- and along-track steering capability for stereoscopy both in-orbit and between orbits
Ice sheet topography3 - highCloud sensitive.. Long time for mapping.. Daylight only.VIS and panchromatic channels with cross- and along-track steering capability for stereoscopy both in-orbit and between orbits
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 topography4 - fairCloud sensitive.. Long time for mapping.. Daylight only.VIS and panchromatic channels with cross- and along-track steering capability for stereoscopy both in-orbit and between orbits