BackForwardInstrument:  CCD 

Instrument details
Acronym CCD
Full name Charge Coupled Device Camera
Purpose Cloud imagery
Short description 3-channel VIS/NIR/SWIR camera [see detailed characteristics below]
Background Consolidated technology
Scanning Technique Electronic, 3-axis stabilised satellite, E-W / S-N continuous by a detector matrix
Resolution 1.0 km
Coverage / Cycle 10° x 10° every 3 hours.  More frequently on demand.  Daylight operation only
Mass 52 kg Power 52 W Data Rate 1288 kbps

 

Providing Agency ISRO
Instrument Maturity Flown on operational programme
Utilization Period: 1999 to 2016
Last update: 2017-03-26
Detailed characteristics
Central wavelength Spectral interval SNR @ specified albedo
0.65 µm 0.62 - 0.68 µm 900  @  100 % albedo
0.81 µm 0.77 - 0.86 µm 850  @  100 % albedo
1.62 µm 1.55 - 1.69 µm 900  @  100 % 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
  • Moderate resolution optical imager
Mission objectives
Primary mission objectives
  • Cloud cover
  • Cloud optical depth
  • Cloud type
  • Wind (horizontal)
Secondary mission objectives
  • Aerosol volcanic ash Total Column
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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
Upward short-wave irradiance at TOA3 - highSpectral interpolation needed.VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Wind (horizontal)5 - marginalCloud or water vapour tracers needed.. Daylight only.VIS channel(s). Frequent sampling (GEO) enables inference from cloud motion
Aerosol volcanic ash5 - marginalCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Aerosol volcanic ash Total Column4 - fairCloud sensitive.. Daylight only.VIS and NIR and SWIR channels. Frequent sampling (GEO) enables early detection of ash plumes
Leaf Area Index (LAI)2 - very highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels
Cloud cover5 - marginalDaylight only.VIS and NIR channels
Cloud type5 - marginalDaylight only.VIS and NIR channels
Cloud optical depth3 - highLow-density cloud only.. Daylight only.VIS, NIR and SWIR channels
Short-wave cloud reflectance4 - fairNo specific limitation.VIS, NIR and SWIR channels
Downward short-wave irradiance at Earth surface3 - highCloud sensitive.. Highly indirect.VIS, NIR and SWIR channels
Earth surface short-wave bidirectional reflectance3 - highCloud sensitive.VIS, NIR and SWIR channels with changing solar incidence angles as daylight progresses
Normalised Difference Vegetation Index (NDVI)3 - highCloud sensitive.VIS and NIR channels
Biomass4 - fairCloud sensitive.. Index only.. Daylight only.VIS, NIR and SWIR channels. Biomass inferred from NDVI and LAI
Soil moisture at surface5 - marginalCloud sensitive.. Index only.. Daylight only.VIS, NIR and SWIR channels. Soil moisture inferred from differential brightness
Fire fractional cover5 - marginalCloud sensitive.. Coarse spatial resolution.. Daylight only.VIS channels
Snow cover2 - very highCloud sensitive.. Daylight only.VIS, NIR and SWIR channels enabling screening snow from clouds. Frequent sampling improves probability of cloud-free views