Algorithm Theoretical Basis Documents (ATBDs) describe the physical theories, mathematical procedures and model assumptions applied in the calculation of geophysical quantities from laser altimetry measurements received by the GEDI instrument. These documents provide necessary background for users to understand and use the GEDI data products. Each ATBD corresponds to one or more GEDI data products and can be accessed in the table below. The ATBDs are currently under development and will be released in Fall 2019.

ATBD#  ATBD nameData productsVersionDate
L1A-2ATransmit and Receive Waveform Interpretation and Generation of L1A and L2A products1A: Raw waveforms

2A: Ground elevation, canopy top height, relative height (RH) metrics

L1BGeolocated waveformsGeolocated waveforms2.005-2017
L2BFootprint Canopy Cover and Vertical Profile MetricsCanopy Cover Fraction (CCF), CCF profile, Leaf Area Index (LAI), LAI profile3.005-2017
L3Gridded Land Surface MetricsGridded Level 2 metrics2.005-2017
L4AFootprint Above Ground BiomassFootprint level above ground biomass3.004-2017
L4BGridded Biomass ProductGridded Above Ground Biomass Density (AGBD)3.004-2017
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