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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 GEDI instrument was removed from the ISS and placed into storage on March 17, 2023. No data were acquired during the hibernation period from March 17, 2023, to April 24, 2024. GEDI has since been reinstalled on the ISS and resumed operations as of April 26, 2024.
The purpose of the GEDI Level 2A Geolocated Elevation and Height Metrics product (GEDI02_A) is to provide waveform interpretation and extracted products from each GEDI01_B received waveform, including ground elevation, canopy top height, and relative height (RH) metrics. The methodology for generating the GEDI02_A product datasets is adapted from the Land, Vegetation, and Ice Sensor (LVIS) algorithm. The GEDI02_A product is provided in HDF5 format and has a spatial resolution (average footprint) of 25 meters.
The GEDI02_A data product contains 156 layers for each of the eight beams, including ground elevation, canopy top height, relative return energy metrics (e.g., canopy vertical structure), and many other interpreted products from the return waveforms. Additional information for the layers can be found in the GEDI Level 2A Dictionary.
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).
Incorrect Reference Ground Track (RGT) number in the filename for select GEDI files: GEDI Science Data Products for six orbits on August 7, 2020, and November 12, 2021, had the incorrect RGT number in the filename. There is no impact to the science data, but users should reference this document for the correct RGT numbers.
Known Issues: Section 8 of the User Guide provides additional information on known issues.
Version Description
The following changes and improvements were implemented for GEDI Version 2 data products: (1) Reduced granule size from one full ISS orbit (~7.99 GB) to four segments per orbit (~2.00 GB), (2) Modified file name to include segment number and dataset version, (3) Improved geolocation for orbital segments, (4) Added elevation from the SRTM digital elevation model for comparison, (5) Modified the method to predict an optimum algorithm setting group per laser shot, (6) Added additional land cover datasets related to phenology, urban infrastructure, and water persistence, (7) Added selected_mode_flag dataset to root beam group using selected algorithm, and (8) Removed shots when the laser is not firing.
Product Summary
Spatial Resolution
25 Meters x 25 Meters
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2019-04-04 to 2023-03-16
,
2024-04-26 to 2025-07-10
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
C2142771958-LPCLOUD
Data State
COMPLETE
Number of Files/Granules
95770
Processing Level
2A
Published
Updated
Citation
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Citation Copied
Dubayah, R., Hofton, M., Blair, J., Armston, J., Tang, H., & Luthcke, S. (2021). GEDI L2A Elevation and Height Metrics Data Global Footprint Level V002 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/GEDI/GEDI02_A.002 Date Accessed: 2026-05-19
Dubayah, Ralph, Michelle Hofton, James Blair, John Armston, Hao Tang, and Scott Luthcke. “GEDI L2A Elevation and Height Metrics Data Global Footprint Level V002.” NASA Land Processes Distributed Active Archive Center, 2021. doi:10.5067/GEDI/GEDI02_A.002. Date Accessed: 2026-05-19
Dubayah, Ralph, et al. GEDI L2A Elevation and Height Metrics Data Global Footprint Level V002. NASA Land Processes Distributed Active Archive Center, 2021, doi:10.5067/GEDI/GEDI02_A.002. Date Accessed: 2026-05-19
The file name begins with the Product Short Name (GEDI02_A), followed by the Julian Date and Time of Acquisition designated as YYYYDDDHHMMSS (2024333190440), the Orbit Number starting with the letter O (O33777), the Sub-Orbit Granule Number (03), Track Number (T03689), the Positioning and Pointing Determination System type where 00 is predict, 01 rapid, 02 and higher is final (02), the Product Generation Executables Version (004), the Granule Production Version (02), the Version Number (V002), and the Data Format (h5).
The GitHub repository, hosted by NASA's Land Processes Distributed Active Archive Center, provides a range of materials for using LP DAAC data and tools.
Wu, Qianhan, Lee, Calvin K.F., Wang, Jonathan A., Zhao, Yingyi, Song, Guangqin, Maeda, Eduardo Eiji, Su, Yanjun, Huete, Alfredo, Hughes, Alice C., Wu, Jin
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.
Non-zero values indicate the shot occured during a degraded period. A non-zero tens digit indicates degraded attitude, a non-zero ones digit indicates a degraded trajectory. 3X=ADF CHU solution unavailable (ST-2); 4X=Platform attitude; 5X=Poor solution (filter covariance large); 6X=Data outage (platform attitude gap also); 7X=ST 1+2 unavailable (similar boresight FOV); 8X=ST 1+2+3 unavailable; 9X=ST 1+2+3 and ISS unavailable; X1=Maneuver; X2=GPS data gap; X3=ST blinding; X4=Other; X5=GPS receiver clock drift; X6=X5+X1; X7=X5+X2; X8=X5+X3; X9=X5+X4.
N/A
uint8
N/A
0 to 99
N/A
N/A
/BEAM0000/delta_time
Transmit time of the shot, measured in seconds from the master_time_epoch. By adding the offset contained within /BEAMXXXX/ancillary/master_time_epoch to delta_time, the time in GPS seconds relative to the GPS epoch can be computed. Equivalent to /BEAMXXXX/master_int+/BEAMXXXX/master_frac.
seconds since 2018-01-01
float64
N/A
N/A
N/A
N/A
/BEAM0000/digital_elevation_model
TanDEM-X elevation at GEDI footprint location
m
float32
N/A
N/A
N/A
N/A
/BEAM0000/digital_elevation_model_srtm
SRTM elevation at GEDI footprint location
m
float32
N/A
N/A
N/A
N/A
/BEAM0000/elevation_bias_flag
Elevations potentially affected by 4bin (~60cm) ranging error
N/A
uint8
N/A
0 to 1
N/A
N/A
/BEAM0000/elevation_bin0_error
Error in elevation of bin 0
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/elev_highestreturn
elevation of highest detected return relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/elev_lowestmode
elevation of center of lowest mode relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/energy_total
Integrated counts in the return waveform relative to the mean noise level
counts
float32
N/A
-5000 to 5000000
N/A
N/A
/BEAM0000/geolocation/elevation_1gfit
Elevation corresponding to the center of a single gaussian fit to the waveform, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elevs_allmodes_a1
Elevations of all modes detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elevs_allmodes_a2
Elevations of all modes detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elevs_allmodes_a3
Elevations of all modes detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elevs_allmodes_a4
Elevations of all modes detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elevs_allmodes_a5
Elevations of all modes detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elevs_allmodes_a6
Elevations of all modes detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_highestreturn_a1
Elevation of the highest return detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_highestreturn_a2
Elevation of the highest return detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_highestreturn_a3
Elevation of the highest return detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_highestreturn_a4
Elevation of the highest return detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_highestreturn_a5
Elevation of the highest return detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_highestreturn_a6
Elevation of the highest return detected using algorithm N, relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestmode_a1
Elevation of the center of the lowest mode detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestmode_a2
Elevation of the center of the lowest mode detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestmode_a3
Elevation of the center of the lowest mode detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestmode_a4
Elevation of the center of the lowest mode detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestmode_a5
Elevation of the center of the lowest mode detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestmode_a6
Elevation of the center of the lowest mode detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestreturn_a1
Elevation of lowest return detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestreturn_a2
Elevation of lowest return detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestreturn_a3
Elevation of lowest return detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestreturn_a4
Elevation of lowest return detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestreturn_a5
Elevation of lowest return detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/elev_lowestreturn_a6
Elevation of lowest return detected using algorithm N,relative to reference ellipsoid
m
float32
N/A
-1000 to 25000
N/A
N/A
/BEAM0000/geolocation/energy_lowestmode_a1
Energy of lowest mode, detected using algorithm N, in the waveform above the mean noise level
counts
float32
N/A
-5000 to 5000000
N/A
N/A
/BEAM0000/geolocation/energy_lowestmode_a2
Energy of lowest mode, detected using algorithm N, in the waveform above the mean noise level
counts
float32
N/A
-5000 to 5000000
N/A
N/A
/BEAM0000/geolocation/energy_lowestmode_a3
Energy of lowest mode, detected using algorithm N, in the waveform above the mean noise level
counts
float32
N/A
-5000 to 5000000
N/A
N/A
/BEAM0000/geolocation/energy_lowestmode_a4
Energy of lowest mode, detected using algorithm N, in the waveform above the mean noise level
counts
float32
N/A
-5000 to 5000000
N/A
N/A
/BEAM0000/geolocation/energy_lowestmode_a5
Energy of lowest mode, detected using algorithm N, in the waveform above the mean noise level
counts
float32
N/A
-5000 to 5000000
N/A
N/A
/BEAM0000/geolocation/energy_lowestmode_a6
Energy of lowest mode, detected using algorithm N, in the waveform above the mean noise level
counts
float32
N/A
-5000 to 5000000
N/A
N/A
/BEAM0000/geolocation/latitude_1gfit
Latitude corresponding to the center of a single gaussian fit to the waveform
