BackForwardInstrument:  WiFS (IRS-P3) 

Instrument details
Acronym WiFS (IRS-P3)
Full name Wide-Field Sensor
Purpose Land and vegetation observation
Short description Two parallel radiometers, 3 VNIR/SWIR channels [see detailed characteristics below]
Background Consolidated technology
Scanning Technique Pushbroom, 4000 pixel/line, swath 770 km (with two instruments)
Resolution 190 m at s.s.p.
Coverage / Cycle Global coverage in 5 days, in daylight
Mass 23 kg Power 22 W Data Rate 2.1 Mbps

 

Providing Agency ISRO
Instrument Maturity Flown on operational programme
Utilization Period: 1996 to 2004
Last update: 2020-01-07
Detailed characteristics

Central wavelength

Spectral interval

SNR @ specified input spectral radiance

0.650 µm

0.62-0.68 µm

200 @ 263 W m-2 sr-1 µm-1

0.815 µm

0.77-0.86 µm

200 @ 285 W m-2 sr-1 µm-1

1.650 µm

1.55-1.75 μm

200 @ ….. W m-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 vegetated land
  • Land cover
  • Leaf Area Index (LAI)
  • Normalised Difference Vegetation Index (NDVI)
  • Vegetation type
Evaluation of Measurements