DAAC Home > Resources > News > GEDI L4B Gridded Aboveground Biomass Density


GEDI L4B Gridded Aboveground Biomass Density

Submitted by ORNL DAAC Staff on 2022-03-30
Image Media
GEDI L4B Gridded Biomass
Image Media

Gridded mean aboveground biomass density (top) and standard error of the mean (bottom).

The ORNL DAAC recently released the following dataset from Dubayah et al. (2022):

GEDI L4B Gridded Aboveground Biomass Density, Version 2

This dataset provides 1 km x 1 km estimates of mean aboveground biomass density (AGBD) from the Global Ecosystem Dynamics Investigation (GEDI).  This gridded, Level 4B product is based on the L4A Footprint Level Aboveground Biomass Density data for mission weeks 19 (starting on 2019-04-18) through 138 (ending on 2021-08-04).  The L4B product uses the footprints within the borders of each 1 km cell to statistically infer mean AGBD and an estimated standard error. The gridding procedure and error estimates are described in the GEDI L4B Algorithm Theoretical Basis Document (ATBD), which is available as a companion file from the dataset's landing page. Uncertainty is due to both the GEDI's sampling of the 1 km area (as opposed to making wall-to-wall observations) and the fact that L4A biomass values are modeled in a process subject to error instead of measured in a process that may be assumed to be error-free.

The Global Ecosystems Dynamics Investigation produces high resolution laser ranging observations of the 3D structure of the Earth. GEDI’s precise measurements of forest canopy height, canopy vertical structure, and surface elevation greatly advance our ability to characterize important carbon and water cycling processes, biodiversity, and habitat. GEDI was funded as a NASA Earth Ventures Instrument (EVI) mission. It was launched to the International Space Station in December 2018 and completed initial orbit checkout in April 2019.

Additional data from the GEDI mission can be found on the ORNL DAAC's GEDI Project Page (Levels 3 and 4) and through the Land Processes DAAC's GEDI Data Catalog (Levels 1 and 2).

Citation: Dubayah, R.O., J. Armston, S.P. Healey, Z. Yang, P.L. Patterson, S. Saarela, G. Stahl, L. Duncanson, and J.R. Kellner. 2022. GEDI L4B Gridded Aboveground Biomass Density, Version 2. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/2017 

Publication Date