Description
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 produces high resolution laser ranging observations of the 3-dimensional structure of the Earth. GEDI is attached to the International Space Station (ISS) and collects data globally between 51.6° N and 51.6° S latitudes at the highest resolution and densest sampling of any light detection and ranging (lidar) instrument in orbit to date. Each GEDI Version 2 granule encompasses one-fourth of an ISS orbit and includes georeferenced metadata to allow for spatial querying and subsetting.
The purpose of the GEDI Level 2B Canopy Cover and Vertical Profile Metrics product (GEDI02_B) is to extract biophysical metrics from each GEDI waveform. These metrics are based on the directional gap probability profile derived from the L1B waveform. Metrics provided include canopy cover, Plant Area Index (PAI), Plant Area Volume Density (PAVD), and Foliage Height Diversity (FHD). The GEDI02_B product is provided in HDF5 format and has a spatial resolution (average footprint) of 25 meters.
The GEDI02_B data product contains 96 layers for each of the eight-beam ground transects (or laser footprints located on the land surface). Datasets provided include precise latitude, longitude, elevation, height, canopy cover, and vertical profile metrics. Additional information for the layers can be found in the GEDI Level 2B Data Dictionary.
Improvements for Version 2
* Metadata has been updated to include spatial coordinates.
* Granule size has been reduced from one full ISS orbit (~1.2 GB) to four segments per orbit (~0.3 GB).
* Filename has been updated to include segment number and version number.
* Improved Geolocation.
* Added elevation from the SRTM digital elevation model for comparison.
* Modified the method to predict an optimum algorithm setting group per laser shot.
* Added additional land cover datasets related to phenology, urban infrastructure, and water persistence.
* Added selected_mode_flag dataset to root beam group using selected algorithm.
* Removed shots when the laser is not firing.
* Modified file name.
Resources
| Name | Format | Description | Link |
|---|---|---|---|
| View this dataset's algorithm theoretical basis document | HTML | The GEDI_L2B ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products. | Open resource |
| View this dataset's algorithm theoretical basis document | HTML | The Waveform Processing ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products. | Open resource |
| View this dataset's algorithm theoretical basis document | HTML | The Geolocation ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products. | Open resource |
| This dataset's landing page | HTML | The product page provides information on Science Data Set layers and links for user guides, ATBDs, data access, tools, customer support, etc. | Open resource |
| Download this dataset through a directory map | HTML | LP DAAC Data Pool provides direct access to available products via HTTPS. | Open resource |
| Get a related visualization | PNG | Browse image for Earthdata Search | Open resource |
| The dataset's project home page | HTML | The GEDI website provides detailed information on the GEDI mission, instrument, science, applications, and data. | Open resource |
| View this dataset's how-to documentation | HTML | Spatial Querying of GEDI Version 2 Data in Python | Open resource |
| View this dataset's how-to documentation | HTML | Spatial Querying of GEDI Version 2 Data in R | Open resource |
| View this dataset's how-to documentation | HTML | GEDI Spatial and Band/Layer Subsetting and Export to GeoJSON Script | Open resource |
| The dataset's project home page | HTML | The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products. | Open resource |
| View documentation related to this dataset | HTML | The data dictionary provides additional information on the Science Dataset (SDS) layers. | Open resource |
| View this dataset's how-to documentation | GEDI Spatial Querying and Subsetting Quick Guide | Open resource | |
| View this dataset's user's guide | The technical information in the User's Guide enables users to interpret and use the data products. | Open resource | |
| View this dataset's how-to documentation | HTML | GEDI L1-L2 Data Resources, Access, and Visualization Demo | Open resource |
| View this dataset's how-to documentation | HTML | Getting Started with GEDI L2B Version 2 in Python | Open resource |
| Google Scholar search results | HTML | Search results for publications that cite this dataset by its DOI. | Open resource |
| Download this dataset through Earthdata Search | HTML | Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data. | Open resource |