BackForwardInstrument:  HRVIR 

Instrument details
Acronym HRVIR
Full name Haute Résolution dans le Visible et l’Infra-Rouge
Purpose High-resolution land and vegetation observation.  Digital Elevation Model (DEM)
Short description Two parallel radiometers, 4 VIS/NIR/SWIR multi-spectral (MS) channels, one also panchromatic (PAN) [see detailed characteristics below]
Background Evolution of HRV on SPOT-1, SPOT-2 , SPOT-3
Scanning Technique Pushbroom, 3000 pixel/line (MS), 6000 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 20 m (MS), 10 m (PAN)
Coverage / Cycle Global coverage in 26 days, in daylight.  With strategic pointing, one place can be observed every 3 days.
Mass Power Data Rate 50 Mbps

 

Providing Agency CNES
Instrument Maturity Flown on operational programme
Utilization Period: 1998 to 2013-01-11
Last update: 2017-03-28
Detailed characteristics
Central wavelength Spectral interval SNR @ specified albedo
0.545 µm 0.50 - 0.59 µm 188 @ 50 % albedo, SZA=60°
0.645 µm (MS) 0.61 - 0.68 µm 198 @ 50 % albedo, SZA=60°
0.645 µm (PAN) 0.61 - 0.68 µm 152 @ 50 % albedo, SZA=60°
0.84 µm 0.79 - 0.89 µm 218 @ 70 % albedo, SZA=60°
1.64 µm 1.58 - 1.75 µm 60 @ 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
Mission objectives
Primary mission objectives
  • Biomass
  • Fraction of vegetated land
  • Leaf Area Index (LAI)
  • Normalised Difference Vegetation Index (NDVI)
  • Vegetation type
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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
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
Aerosol volcanic ash5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels
Aerosol volcanic ash Total Column5 - marginalCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels
Cloud cover5 - marginalInfrequent coverage.. Daylight only.VIS, NIR and SWIR channels
Cloud optical depth3 - highLow-density cloud only.. Infrequent coverage.. 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
Short-wave cloud reflectance4 - fairInfrequent coverage.VIS, NIR and SWIR channels. Unsuitable dynamic range (saturation)
Leaf Area Index (LAI)2 - very highCloud sensitive.. Daylight only.. Infrequent coverage.VIS, NIR and SWIR channels
Vegetation type2 - very highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Fraction of vegetated land1 - primaryCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Biomass4 - fairCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS, NIR and SWIR 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 cover1 - primaryCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR, SWIR (snow/cloud discrimination) and panchromatic (higher resolution) channels
Soil type1 - primaryCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Land cover1 - primaryCloud sensitive.. Daylight only.VIS, NIR and SWIR 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 cover3 - highCloud sensitive.. Long time for mapping.. Daylight only.VIS, NIR, SWIR and panchromatic channels for accurate boundary detection and screening ice from clouds
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