Google Earth Engine (GEE) - GEDI L4B Global Surface Biomass Density 1000m Resolution Dataset

GEDI L4B Gridded Aboveground Biomass Density (Version 2)

This Global Ecosystem Dynamics Survey (GEDI) L4B product provides a 1km x 1km average aboveground biomass based on observations from mission week 19 starting on 2019-04-18 and mission week 138 ending on 2021-08-04 Estimated value of density (AGBD). The GEDI L4A footprint biomass product converts each high-quality waveform into an AGBD prediction, while the L4B product statistically infers the mean AGBD using samples present within each 1 km cell boundary.

GEDI L2A vector data can be found in table set LARSE/GEDI/GEDI02_A_002.

GEDI L2A monthly raster data can be found in the image set LARSE/GEDI/GEDI02_A_002_MONTHLY.

See the user guide for more information.

Dataset Availability

2019-04-18T00:00:00Z - 2021-08-04T00:00:00

Dataset Provider

USFS Laboratory for Applications of Remote Sensing in Ecology (LARSE) NASA GEDI mission, accessed through the USGS LP DAAC

Earth Engine Snippet

ee.Image("LARSE/GEDI/GEDI04_B_002")

Resolution
1000 meters

Bands

Name	Units	Description
MU	Mg ha^-1	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^-1	Mean aboveground biomass density standard error (SE): Standard Error of the mean estimate, combining sampling and modeling uncertainty.
PE	Percent	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

Code:

 

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');

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/2017

• GEDI L4B Gridded Aboveground Biomass Density, Version 2, https://doi.org/10.3334/ORNLDAAC/2017

 Standard deviation:

 Average biomass: