GEDI L4B Gridded Aboveground Biomass Density (Version 2)
这个全球生态系统动态调查（GEDI）L4B产品提供了基于从2019-04-18开始的第19任务周到2021-08-04结束的第138任务周的观测结果的1公里×1公里平均地上生物量密度（AGBD）的估计值。GEDI L4A足迹生物量产品将每个高质量的波形转换为AGBD预测，而L4B产品使用每个1公里单元边界内存在的样本来统计推断平均AGBD。
GEDI L2A矢量数据可以在表集LARSE/GEDI/GEDI02_A_002中找到。
GEDI L2A月度栅格数据可以在图像集LARSE/GEDI/GEDI02_A_002_MONTHLY中找到。
更多信息请见用户指南。
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)
|
|
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)
|
|
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.
|
代码：
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
标准差：
平均生物量：
