GEDI L4B Gridded Aboveground Biomass Density (Version 2)

LARSE/GEDI/GEDI04_B_002
Dataset Availability
2019-04-18T00:00:00Z–2021-08-04T00:00:00Z
Dataset Provider
Earth Engine Snippet
ee.Image("LARSE/GEDI/GEDI04_B_002")

Description

This Global Ecosystem Dynamics Investigation (GEDI) L4B product provides 1 km x 1 km 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.

Please see User Guide for more information.

The Global Ecosystem Dynamics Investigation GEDI mission aims to characterize ecosystem structure and dynamics to enable radically improved quantification and understanding of the Earth's carbon cycle and biodiversity. The GEDI instrument, attached to the International Space Station (ISS), collects data globally between 51.6° N and 51.6° S latitudes at the highest resolution and densest sampling of the 3-dimensional structure of the Earth. The GEDI instrument consists of three lasers producing a total of eight beam ground transects, which instantaneously sample eight ~25 m footprints spaced approximately every 60 m along-track.

Product Description
L2A Vector LARSE/GEDI/GEDI02_A_002
L2A Monthly raster LARSE/GEDI/GEDI02_A_002_MONTHLY
L2A table index LARSE/GEDI/GEDI02_A_002_INDEX
L2B Vector LARSE/GEDI/GEDI02_B_002
L2B Monthly raster LARSE/GEDI/GEDI02_B_002_MONTHLY
L2B table index LARSE/GEDI/GEDI02_B_002_INDEX
L4A Biomass Vector LARSE/GEDI/GEDI04_A_002
L4A Monthly raster LARSE/GEDI/GEDI04_A_002_MONTHLY
L4A table index LARSE/GEDI/GEDI04_A_002_INDEX
L4B Biomass LARSE/GEDI/GEDI04_B_002

Bands

Resolution
1000 meters

Bands

Name Units Description
MU Mg/ha

Mean aboveground biomass density (MU): Estimated mean AGBD for the 1 km grid cell, including forest and non-forest.
V1

Variance component 1 (V1): Uncertainty in the estimate of mean biomass due to the field-to-GEDI model used in L4A.
V2

Variance component 2 (V2)

  • If Mode of Inference = 1, this is the uncertainty due to GEDI's sampling of the 1 km cell.
  • If Mode of Inference = 2, this is uncertainty owing to the model predicting biomass using wall-to-wall data, calibrated with the L4A footprint product.
SE Mg/ha

Mean aboveground biomass density standard error (SE): Standard Error of the mean estimate, combining sampling and modeling uncertainty.
PE %

Standard error as a fraction of the estimated mean AGBD (PE). If >100%, the cell values are truncated to 100.
NC

Number of clusters (NC): Number of unique GEDI ground tracks with at least one high-quality waveform intersecting the grid cell.
NS

Number of samples (NS): Total number of high-quality waveforms across all ground tracks within the grid cell.
QF

Quality flag (QF)

  • 0=Outside the GEDI domain
  • 1=Land surface
  • 2=Land surface and meets GEDI mission L1 requirement (Percent standard error <20% or Standard Error < 20 Mg ha-1)
PS

Prediction stratum (PS) determined by plant functional type and continent. PS is associated with an L4A model parameter covariance matrix that contributes to the Model Error Variance (Table 2).
MI

Mode of interference (MI): Method used for a particular cell. Until mission completion, only those cells where hybrid inference is possible will be populated with a mean biomass value.

  • 0=None applied
  • 1=Hybrid Model-Based
  • 2=Generalized Hierarchical Model-Based

Terms of Use

Terms of Use

This dataset is in the public domain and is available without restriction on use and distribution. See NASA's Earth Science Data & Information Policy for additional information.

Citations

Citations:

  • 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. doi:10.3334/ORNLDAAC/2056

DOIs

Explore with Earth Engine

Code Editor (JavaScript)

var l4b = ee.Image('LARSE/GEDI/GEDI04_B_002')

Map.addLayer(
    l4b.select('MU'),
    {min: 10, max: 250, palette: '440154,414387,2a788e,23a884,7ad151,fde725'},
    'Mean Biomass');
Map.addLayer(
    l4b.select('SE'),
    {min: 10, max: 50, palette: '000004,3b0f6f,8c2981,dd4a69,fe9f6d,fcfdbf'},
    'Standard Error');
Open in Code Editor
This Global Ecosystem Dynamics Investigation (GEDI) L4B product provides 1 km x 1 km 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 …
LARSE/GEDI/GEDI04_B_002, elevation,gedi,larse,nasa,tree-cover,usgs
2019-04-18T00:00:00Z/2021-08-04T00:00:00Z
-52.0 -180.0 52.0 180.0
Google Earth Engine