BackForwardInstrument:  OHRIS 

Instrument details
Acronym OHRIS
Full name OrbView High Resolution Imaging System
Purpose Very-high-resolution land imagery
Short description 5 VIS/NIR channels including 1 panchromatic [see detailed characteristics below]
Background Evolution of OSA flown on Ikonos
Scanning Technique Whiskbroom, 8,000 detector array (PAN), 2,000 detector array (multispectral). Swath 8 km addressable by tilting the satellite in a variety of operating modes within a Field-of-Regard of 980 km. Stereo capability both along-track and cross-orbits
Resolution 1 m (panchromatic), 4 m (multi-spectral)
Coverage / Cycle Global coverage in 1 year, in daylight; in few days (down to 3) by strategic pointing
Mass 66 kg Power Data Rate

 

Providing Agency GeoEye
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2001-09-21 to 2007-04-23
Last update: 2017-03-29
Detailed characteristics
Central wavelength Spectral interval SNR @ specified albedo
N/A (PAN) 450 - 900 nm ……….. @ ……… % albedo
485 nm 450 - 520 nm ……….. @ ……… % albedo
560 nm 520 - 600 nm ……….. @ ……… % albedo
660 nm 625 - 695 nm ……….. @ ……… % albedo
830 nm 760 - 900 nm ……….. @ ……… % 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
Biomass5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS and NIR channels. Biomass inferred from NDVI
Cloud cover5 - marginalInfrequent coverage.. Daylight only.VIS and NIR channels
Cloud optical depth5 - marginalLow-density cloud only.. Infrequent coverage.. Daylight only.VIS and NIR channels
Earth surface albedo4 - fairCloud sensitive.. Infrequent coverage.VIS channels
Fire fractional cover1 - primaryCloud sensitive.. Infrequent coverage.. Daylight only.Panchromatic channel with high resolution, for fire boundary detection
Fraction of Absorbed PAR (FAPAR)3 - highCloud sensitive.. Infrequent coverage.VIS channels including Red at 700 nm
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 topography4 - fairCloud 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 topography4 - fairCloud sensitive.. Long time for mapping.. Daylight only.VIS and panchromatic channels with cross-track steering capability for stereoscopy between images from neighbouring orbits
Land cover3 - 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-track steering capability for stereoscopy between images from neighbour orbits
Leaf Area Index (LAI)5 - marginalCloud sensitive.. Daylight only.. Infrequent coverage.VIS and NIR channels. LAI inferred from NDVI
Normalised Difference Vegetation Index (NDVI)2 - very highCloud sensitive.. Infrequent coverage.VIS and NIR channels
Photosynthetically Active Radiation (PAR)4 - fairCloud sensitive.. Infrequent coverage.VIS channels, range undersampled
Sea-ice cover5 - marginalCloud sensitive.. Daylight only.VIS and NIR (for contour enhancement) channels
Short-wave cloud reflectance5 - marginalInfrequent coverage.VIS and NIR channels. Unsuitable dynamic range (saturation)
Snow cover3 - highCloud sensitive.. Infrequent coverage.. Daylight only.VIS, NIR and panchromatic (higher resolution) channels
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Infrequent coverage.. Daylight only.VIS and NIR channels. Soil moisture inferred from differential brightness
Soil type5 - marginalCloud sensitive.. 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
Vegetation type4 - fairCloud sensitive.. Daylight only.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