GEDI L4B Gridded Aboveground Biomass Density, Version 2 (User guide)

Abstract

This Global Ecosystem Dynamics Investigation (GEDI) L4B product provides 1 km x 1 km (1 km, hereafter) estimates of mean aboveground biomass density (AGBD) based on observations from mission week 19 starting on 2019-04-18 to mission week 138 ending on 2021-08-04. The GEDI L4A Footprint Biomass product converts each high-quality waveform to an AGBD prediction, and the L4B product uses the sample present within the borders of each 1 km cell to statistically infer mean AGBD. The gridding procedure is described in the GEDI L4B Algorithm Theoretical Basis Document (ATBD). Patterson et al. (2019) describes the hybrid model-based mode of inference used in the L4B product. Corresponding 1 km estimates of the standard error of the mean are also provided in the L4B product. Uncertainty is due to both 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. Data and companion files can be downloaded here: https://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=2017.

Citation

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