Skip to main content

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).

Product Summary

Platforms
ISS
Instruments
GEDI
Spatial Extent

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

Spatial Resolution
25 Meters x 25 Meters
Location
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

Publications Citing This Dataset

No Results

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor Offset
pgap_theta_aN Estimated Pgap (theta) from ground finding algorithm for each L2A processing version. This Variable record represents pgap_theta_a1 through pgap_theta_a6. N/A float32 -9999 0 to 1 N/A N/A
pgap_theta_error Total Pgap (theta) error N/A float32 -9999 0 to 1 N/A N/A
pgap_theta_error_aN Uncertainty of Pgap (theta) caused by ground finding algorithm for each L2A processing version. This Variable record represents pgap_theta_error_a1 through pgap_theta_error_a6. N/A float32 -9999 N/A N/A N/A
pgap_theta_z Directional gap probability profile N/A float32 -9999 0 to 10000 N/A N/A
rg Integral of the ground component in the RX waveform for the selected L2A processing version Number float32 -9999 N/A N/A N/A
rg_aN Integral of the ground component in the received waveform for each L2A processing version. This Variable record represents rg_a1 through rg_a6. Number float32 -9999 N/A N/A N/A
rg_eg_amplitude_aN Amplitude of the extended Gaussian fit to the ground of RX waveform. This Variable record represents rg_eg_amplitude_a1 through rg_eg_amplitude_a6. Number float32 -9999 N/A N/A N/A
rg_eg_amplitude_error_aN Error in amplitude of the extended Gaussian fit to the ground of RX waveform. This Variable record represents rg_eg_amplitude_error_a1 through rg_eg_amplitude_error_a6. Number float32 -9999 N/A N/A N/A
rg_eg_center_aN Center of the extended Gaussian fit to the ground of RX waveform. This Variable record represents rg_eg_center_a1 through rg_eg_center_a6. Nanoseconds float32 -9999 N/A N/A N/A
rg_eg_center_error_aN Error in center of the extended Gaussian fit to the ground of RX waveform. This Variable record represents rg_eg_center_error_a1 through rg_eg_center_error_a6. Nanoseconds float32 -9999 N/A N/A N/A
rg_eg_chisq_aN Chi square of R (ground) fit. This Variable record represents rg_eg_chisq_a1 through rg_eg_chisq_a6. N/A float32 -9999 N/A N/A N/A
rg_eg_constraint_center_buffer Buffer size used to constrain the center parameter in the exponentially modified Gaussian fit to R (ground) Nanoseconds int32 N/A N/A N/A N/A
rg_eg_flag_aN Extended Gaussian fit status flag. This Variable record represents rg_eg_flag_a1 through rg_eg_flag_a6. Class Flag int8 N/A 0 to 255 N/A N/A
rg_eg_gamma_aN Gamma value of the extended Gaussian fit to the ground of RX waveform. This Variable record represents rg_eg_gamma_a1 through rg_eg_gamma_a6. N/A float32 -9999 N/A N/A N/A
rg_eg_gamma_error_aN Error in gamma value of the extended Gaussian fit to the ground of RX waveform. This Variable record represents rg_eg_gamma_error_a1 through rg_eg_gamma_error_a6. N/A float32 -9999 N/A N/A N/A
rg_eg_mpfit_maxiters MPFIT maximum number of iterations N/A uint16 N/A N/A N/A N/A
rg_eg_mpfit_max_func_evals MPFIT maximum number of function evaluations N/A uint16 N/A N/A N/A N/A
rg_eg_mpfit_tolerance MPFIT convergence criterium N/A float64 N/A N/A N/A N/A
rg_eg_niter_aN Number of iterations to converge extended Gaussian fit to RX waveform. This Variable record represents rg_eg_niter_a1 through rg_eg_niter_a6. N/A uint8 N/A N/A N/A N/A
rg_eg_sigma_aN Sigma value of the extended Gaussian fit to the ground of RX waveform. This Variable record represents rg_eg_sigma_a1 through rg_eg_sigma_a6. Nanoseconds float32 -9999 N/A N/A N/A
rg_eg_sigma_error_aN Error in sigma value of the extended Gaussian fit to the ground of RX waveform. This Variable record represents rg_eg_sigma_error_a1 through rg_eg_sigma_error_a6. Nanoseconds float32 -9999 N/A N/A N/A
rg_error_aN Error of the integral of the ground component in the received waveform for each L2A processing version. This Variable record represents rg_error_a1 through rg_error_a6. Number float32 -9999 N/A N/A N/A
rh100 Height above ground of the received waveform signal start (rh[101] from L2A) cm int16 N/A -21300 to 21300 N/A N/A
rhog Volumetric scattering coefficient (rho) of the ground Number float32 -9999 N/A N/A N/A
rhog_error Rho (ground) error Number float32 -9999 N/A N/A N/A
rhov Volumetric scattering coefficient (rho) of the canopy Number float32 -9999 N/A N/A N/A
rhov_error Rho (canopy) error Number float32 -9999 N/A N/A N/A
rossg Ross-G function N/A float32 -9999 0 to 1 N/A N/A
rv Integral of the vegetation component in the RX waveform for the selected L2A processing version Number float32 -9999 N/A N/A N/A
rv_aN Integral of the vegetation component in the received waveform for each L2A processing version. This Variable record represents rv_a1 through rv_a6. Number float32 -9999 N/A N/A N/A
rx_energy_aN Received waveform energy. This Variable record represents rx_energy_a1 through rx_energy_a6. Number float32 -9999 N/A N/A N/A
rx_range_highestreturn Range to signal start Meters float64 -9999 N/A N/A N/A
rx_sample_count Received sample count Number int64 N/A N/A N/A N/A
rx_sample_start_index Received sample start index Number int64 N/A N/A N/A N/A
selected_l2a_algorithm Selected L2A algorithm setting N/A uint8 N/A 1 to 6 N/A N/A
selected_rg_algorithm Selected R (ground) algorithm N/A uint8 N/A N/A N/A N/A
sensitivity Maxmimum canopy cover that can be penetrated N/A float32 N/A 0 to 1 N/A N/A
shot_number Unique shot identifier Number float64 N/A N/A N/A N/A
signal_search_buff Buffer size used to extend above toploc and below botloc Nanoseconds float64 N/A 0 to 255 N/A N/A
solar_azimuth The azimuth of the sun position vector from the laser bounce point position in the local ENU frame measured from North and is positive towards East Degree float32 N/A -180 to 180 N/A N/A
solar_elevation The elevation of the sun position vector from the laser bounce point position in the local ENU frame measured from the East-North plane and is positive Up Degree float32 N/A -90 to 90 N/A N/A
stale_return_flag Stale return flag Class Flag uint8 N/A 0 to 1 N/A N/A
surface_flag Surface flag indicating elevation of lowest mode Class Flag uint8 N/A 0 to 1 N/A N/A
tx_noise_stddev_multiplier Multiplier on the transmit waveform noise standard deviation used R (ground) estimation N/A float64 N/A 0 to 255 N/A N/A
You're viewing 94 of 94