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Description

GEDI Version 1 data products were decommissioned on February 15, 2022. Users are advised to use the improved GEDI02_B Version 2 (https://doi.org/10.5067/GEDI/GEDI02_B.002) data product.

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 and collects data globally between 51.6 degrees N and 51.6 degrees S latitudes at the highest resolution and densest sampling of any light detection and ranging (lidar) instrument in orbit to date.

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 HDF-5 format and has a spatial resolution (average footprint) of 25 meters.

The GEDI02_B data product contains 96 variables for each of the eight-beam ground transects (or laser footprints located on the land surface). Variables provided include precise latitude, longitude, elevation, height, canopy cover, and vertical profile metrics. Additional information for the variables can be found in the GEDI Level 2B Data Dictionary.

Known Issues

  • Known Issues: Section 7 of the User Guide provides additional information on known issues.

  • Data acquisition gaps: GEDI data acquisitions were suspended on December 19, 2019 (2019 Day 353) and resumed on January 8, 2020 (2020 Day 8).

Version Description

GEDI Version 1 data products were decommissioned on February 15, 2022. Users are advised to use the improved GEDI02_B Version 2 data product.

Product Summary

Platforms
ISS
Instruments
GEDI
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Spatial Resolution
25 Meters x 25 Meters
Geographic Region
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
NO_SPATIAL
Temporal Extent
2019-04-18 to 2020-09-03
Temporal Resolution
Varies
Data Partner
Land Processes Distributed Active Archive Center (LP DAAC) ,
Global Ecosystem Dynamics Investigation, Goddard Space Flight Center, NASA (NASA/GSFC/GEDI)
Concept ID
C2141088577-LPCLOUD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
2B
Published
Updated
Science Keywords
Topography ,
Lidar ,
Canopy Characteristics ,
Digital Elevation/Terrain Model (DEM) ,
Vegetation Cover ,
VEGETATION HEIGHT ,
VIEWING GEOMETRY ,
Terrain Elevation

File Naming Convention

GEDI02_B_2019247125551_O04125_T02514_02_001_01.h5

The file name begins with the Product Short Name (GEDI02_B), followed by the Julian Date and Time of Acquisition designated as YYYYDDDHHMMSS (2019247125551), the Orbit Number starting with the letter O (O04125), Track Number (T02514), the Positioning and Pointing Determination System type where 00 is predict, 01 rapid, 02 and higher is final (02), the Software Release Number (001), the Granule Production Version (01), and the Data Format (h5).

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
algorithmrun_flag The L2B algorithm is run if this flag is set to 1 indicating data have sufficient waveform fidelity for L2B to run N/A uint8 N/A 0 to 1 N/A
algorithmrun_flag_aN For each L2A algorithm, the L2B algorithm is run if this flag is set to 1 which indicates sufficient waveform fidelity. This Variable record represents algorithmrun_flag_a1 through algorithmrun_flag_a6. Class Flag uint8 N/A 0 to 1 N/A
beam Beam number Number uint16 N/A 0 to 11 N/A
channel Channel number Number uint8 N/A 0 to 7 N/A
cover Total canopy cover Percent float32 -9999 0 to 1 N/A
cover_z Cumulative canopy cover vertical profile Percent float32 -9999 0 to 1 N/A
degrade_flag Degrade flag is set to greater than zero if the shot occurs during a degrade period, zero otherwise Class Flag int8 N/A 0 to 1 N/A
delta_time Transmit time of the shot, measured in seconds from the master_time_epoch since 2018-01-01 Seconds float64 N/A N/A N/A
digital_elevation_model Digital elevation model height above the WGS84 ellipsoid Meters float32 -999999 -962 to 10038 N/A
dz Vertical step size of foliage profile Meters float64 N/A N/A N/A
elevation_bin0 Elevation of first bin of the pgap_theta_z, interpolated from L1B waveform coordinate Meters float64 -9999 N/A N/A
elevation_bin0_error Error in elevation of first bin of the pgap_theta_z, interpolated from L1B waveform coordinate Meters float32 -9999 N/A N/A
elevation_lastbin Elevation of last bin of the pgap_theta_z, interpolated from L1B waveform coordinate Meters float64 -9999 N/A N/A
elevation_lastbin_error Error in elevation of last bin of the pgap_theta_z, interpolated from L1B waveform coordinate Meters float32 -9999 N/A N/A
elev_highestreturn Elevation of highest detected return relative to reference ellipsoid Meters float32 N/A -1000 to 25000 N/A
elev_lowestmode Elevation of center of lowest mode relative to reference ellipsoid Meters float32 N/A -1000 to 25000 N/A
fhd_normal Foliage Height Diversity N/A float32 -9999 N/A N/A
height_bin0 Height of the first bin of the pgap_theta_z, relative to the ground Meters float32 -9999 N/A N/A
height_lastbin Height of the last bin of the pgap_theta_z, relative to the ground Meters float32 -9999 N/A N/A
l2a_alg_count Number of candidate algorithms available in the corresponding GEDI L2A data product Number int64 N/A N/A N/A
l2a_quality_flag L2A quality flag Quality Flag uint8 N/A 0 to 1 N/A
l2b_quality_flag L2B quality flag Quality Flag uint8 N/A 0 to 1 N/A
landsat_treecover Tree cover in the year 2010, defined as canopy closure for all vegetation taller than 5 m in height encoded as a percentage per output grid cell Percent float64 -9999 N/A N/A
latitude_bin0 Latitude of first bin of the pgap_theta_z, interpolated from L1B waveform coordinate Degree float64 -9999 N/A N/A
latitude_bin0_error Error in latitude of first bin of the pgap_theta_z, interpolated from L1B waveform coordinate Degree float32 -9999 N/A N/A
latitude_lastbin Latitude of last bin of the pgap_theta_z, interpolated from L1B waveform coordinate Degree float64 -9999 N/A N/A
latitude_lastbin_error Error in latitude of last bin of the pgap_theta_z, interpolated from L1B waveform coordinate Degree float32 -9999 N/A N/A
lat_highestreturn Latitude of highest detected return Degree float64 N/A -55 to 55 N/A
lat_lowestmode Latitude of center of lowest mode Degree float64 N/A -55 to 55 N/A
local_beam_azimuth Azimuth of the unit pointing vector for the laser in the local ENU frame measured from North and positive towards East Radians float32 N/A -180 to 180 N/A
local_beam_elevation Elevation of the unit pointing vector for the laser in the local ENU frame measured from East-North plane and positive towards Up Radians float32 N/A 1.3962634 to 1.5707964 N/A
longitude_bin0 Longitude of first bin of the pgap_theta_z, interpolated from L1B waveform coordinate Degree float64 -9999 N/A N/A
longitude_bin0_error Error in longitude of first bin of the pgap_theta_z, interpolated from L1B waveform coordinate Degree float32 -9999 N/A N/A
longitude_lastbin Longitude of last bin of the pgap_theta_z, interpolated from L1B waveform coordinate Degree float64 -9999 N/A N/A
longitude_lastbin_error Error in longitude of last bin of the pgap_theta_z, interpolated from L1B waveform coordinate Degree float32 -9999 N/A N/A
lon_highestreturn Longitude of highest detected return Degree float64 N/A -180 to 180 N/A
lon_lowestmode Longitude of center of lowest mode Degree float64 N/A -180 to 180 N/A
master_frac Master time fractional seconds Seconds float64 N/A N/A N/A
master_int Master time integer seconds Seconds uint32 N/A N/A N/A
maxheight_cuttoff The maximum height above ground value used for foliage profile calculation Meters float64 N/A 0 to 150 N/A
modis_nonvegetated Percent non-vegetated from MODIS MOD44B V6 data Percent float64 -9999 N/A N/A
modis_nonvegetated_sd Percent non-vegetated standard deviation from MODIS MOD44B V6 data Percent float64 -9999 N/A N/A
modis_treecover Percent tree cover from MODIS MOD44B V6 data Percent float64 -9999 N/A N/A
modis_treecover_sd Percent tree cover standard deviation from MODIS MOD44B V6 data Percent float64 -9999 N/A N/A
num_detectedmodes Number of detected modes in received (RX) waveform Number uint8 N/A N/A N/A
omega Foliage Clumping Index N/A float32 N/A 0 to 1 N/A
pai Total Plant Area Index m²/m² float32 -9999 N/A N/A
pai_z Plant Area Index profile m²/m² float32 -9999 N/A N/A
pavd_z Plant Area Volume Density profile m²/m³ float32 -9999 N/A N/A
pgap_theta Total Gap Probability (theta) N/A float32 -9999 0 to 1 N/A
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