BackForwardInstrument:  HRG 

Instrument details
Acronym HRG
Full name Haute Résolution Géométrique
Purpose High-resolution land and vegetation observation.  Digital Elevation Model (DEM)
Short description Two parallel radiometers, 5 VIS/NIR/SWIR channels, 4 multi-spectral (MS), one panchromatic (PAN) [see detailed characteristics below]
Background Evolution of HRVIR on SPOT-4
Scanning Technique Pushbroom, 6000 pixel/line (MS), 12000 pixel/line (PAN), swath 60 km ssp (117 km with two instruments), cross-track pointing capability within a range of ± 450 km.  Stereoscopic capability between successive orbits
Resolution 10 m (the three VNIR channels), 20 m (the SWIR channel), 5 m (PAN) with super-mode at 2.5 m
Coverage / Cycle Global coverage in 26 days, in daylight.  With strategic pointing, one place can be observed every 3 days.
Mass 356 kg Power 344 W Data Rate 100 Mbps

 

Providing Agency CNES
Instrument Maturity Flown on operational programme
Utilization Period: 2002 to 2015
Last update: 2022-07-25
Detailed characteristics
Central wavelength Spectral interval SNR @ specified albedo
0.545 µm 0.49 - 0.61 µm 171 @ 50 % albedo, SZA=60°
0.645 µm 0.61 - 0.68 µm 188 @ 50 % albedo, SZA=60°
0.835 µm 0.78 - 0.89 µm 202 @ 70 % albedo, SZA=60°
1.645 µm 1.58 - 1.75 µm 189 @ 50 % albedo, SZA=60°
0.59 µm (PAN) (2 shifted channels) 0.49 - 0.69 µm 149 @ 50 % albedo, SZA=60°
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
  • Leaf Area Index (LAI)
  • Normalised Difference Vegetation Index (NDVI)
  • Vegetation type
Evaluation of Measurements