BackForwardInstrument:  GEDI Lidar 

Instrument details
Acronym GEDI Lidar
Full name Global Ecosystem Dynamics Investigation Lidar
Purpose Accurate topography and its changes to monitor biomass, ecosystems and ice
Short description 3 lasers are split into 7 beams dithered to produce 14 ground track spot beams. Laser wavelength 1064 nm
Background
Scanning Technique Beams have a 25 meter footprint and are spaced 500 m cross track and 60 m along-track for a total swath of 7 km. Steerable pointing within a Field of Regard not yet known
Resolution 25 m s.s.p.
Coverage / Cycle Depending on pointing strategy. Limited in latitude because of the ISS 51.6° inclination orbit
Mass 230 kg Power 516 W Data Rate 2.1 Mbps

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: ≥2019-03 to ≥2023
Last update: 2017-03-31
Detailed characteristics
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
  • Active and radio-occultation sensor
  • Lidar (Doppler lidar, backscatter lidar, lidar Dial, lidar altimeter)
Mission objectives
Primary mission objectives
  • Biomass
  • Glacier topography
  • Land surface topography
Secondary mission objectives
  • Coastal sea level (tide)
  • Geoid
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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
Aerosol column burden4 - fairCloud sensitive.Opportunity information from lidar altimeter
Aerosol mass mixing ratio5 - marginalCloud sensitive.Opportunity information from lidar altimeter
Aerosol Optical Depth4 - fairCloud sensitive.Opportunity information from lidar altimeter
Biomass1 - primaryCloud sensitive.. Index only.. Infrequent coverage.Specifically designed for canopy mapping
Cloud drop effective radius4 - fairLow-density cloud only.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter. Mapping capability.
Cloud ice5 - marginalLow-density cloud only.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter. Mapping capability.
Cloud ice (total column)3 - highLow-density cloud only.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter. Mapping capability.
Cloud ice effective radius4 - fairLow-density cloud only.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter. Mapping capability.
Cloud liquid water (CLW)4 - fairLow-density cloud only.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter. Mapping capability.
Cloud liquid water (CLW) total column3 - highLow-density cloud only.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter. Mapping capability.
Cloud optical depth3 - highLow-density cloud only.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter. Mapping capability.
Cloud top height2 - very highInfrequent coverage.Opportunity information from multi-beam lidar altimeter. Mapping capability.
Coastal sea level (tide)3 - highCloud sensitive.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter (for canopy mapping)
Freezing level height in clouds4 - fairLow-density cloud only.. Infrequent coverage.Opportunity information from multi-beam lidar altimeter. Detected as discontinuity. Mapping capability
Geoid2 - very highLong time series needed.Geoid derived from multi-temporal analysis of lidar altimetry data
Glacier topography2 - very highCloud sensitive.. Long time for mapping.Mainly designed for canopy. Mapping capability
Gravity field3 - highPartial information (geoid).Gravity field derived from multi-temporal analysis of lidar altimetry data
Height of the top of PBL2 - very highCloud sensitive.. Infrequent coverage.Opportunity information from lidar altimeter. PBL top detected as discontinuity. Mapping capability
Height of the tropopause2 - very highCloud sensitive.. Infrequent coverage.Opportunity information from from lidar altimeter. Tropopause height detected as discontinuity. Mapping capability
Land surface topography2 - very highCloud sensitive.. Long time for mapping.Mainly designed for canopy. Mapping capability
Melting layer depth in clouds4 - fairLow-density cloud only.. Infrequent coverage.Opportunity information from lidar altimeter. Detected as discontinuity. Mapping capability
Ocean dynamic topography2 - very highCloud sensitive.. Infrequent coverage.. Long time for mapping.Opportunity information from multi-beam lidar altimeter (for canopy mapping)
PSC occurrence2 - very highInfrequent coverage.NIR lidar altimeter, multi-beam. Mapping capability
Sea-ice elevation2 - very highCloud sensitive.. Infrequent coverage.NIR lidar altimeter, multi-beam, mainly designed for canopy, but also usable for ice elevation. Mapping capability
Sea-ice thickness3 - highCloud sensitive.. Infrequent coverage.. Change detection only.NIR lidar altimeter, multi-beam, mainly designed for canopy, but also usable for ice elevation. Mapping capability. Thickness inferred by ice model
Aerosol volcanic ash4 - fairCloud sensitive.Opportunity information from lidar altimeter
Aerosol volcanic ash (Total column)3 - highCloud sensitive.Opportunity information from lidar altimeter