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Description

GEDI Version 1 data products were decommissioned on February 15, 2022. Users are advised to use the improved GEDI02_A Version 2 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 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 GEDI01_B product is provided in HDF5 format and has a spatial resolution (average footprint) of 25 meters.

The GEDI02_A data product contains 156 variables for each of the eight beams, including ground elevation, canopy top height, relative return energy metrics (describing canopy vertical structure, for example), and many other interpreted products from the return waveforms. Additional information for the variables can be found in the GEDI Level 2A 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_A 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
C2141085552-LPCLOUD
Data State
DEPRECATED
Processing Level
2A
Published
Updated
Science Keywords
Topography,
Lidar,
Plant Phenology,
VEGETATION HEIGHT,
Vegetation Cover,
Canopy Characteristics

File Naming Convention

GEDI02_A_2019247221245_O04131_T05060_02_001_01.h5

The file name begins with the Product Short Name (GEDI02_A), followed by the Julian Date and Time of Acquisition designated as YYYYDDDHHMMSS (2019247221245), the Orbit Number starting with the letter O (O04131), Track Number (T05060), 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

Filters
Title Year Author
Improving forest above-ground biomass retrieval using multi-sensor L- and C- Band SAR data and multi-temporal spaceborne LiDAR data Musthafa, M.
Global canopy height regression and uncertainty estimation from GEDI LIDAR waveforms with deep ensembles Lang, N.
Neural network guided interpolation for mapping canopy height of China's forests by integrating GEDI and ICESat-2 data Liu, X.
Forest above-ground woody biomass estimation using multi-temporal space-borne LiDAR data in a managed forest at Haldwani, India Musthafa, M.
Assessing amazon rainforest regrowth with GEDI and ICESat-2 data Milenković, M.
Evaluation of the performances of radar and lidar altimetry missions for water level retrievals in mountainous environment: The case of the swiss lakes Frappart, F.
The role of time-series L-Band SAR and GEDI in mapping sub-tropical above-ground biomass Khati, U.
A CNN-based approach for the estimation of canopy heights and wood volume from GEDI waveforms Fayad, I.
Mapping amazon forest productivity by fusing GEDI lidar waveforms with an individual-based forest model Bauer, L.
Combining GEDI and Sentinel-2 for wall-to-wall mapping of tall and short crops Di Tommaso, S.
SHOWING 10 OF 16

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
ampval_limit2 Final ground return pulse selection parameter Number float64 0 0 to 4096 N/A
ampval_limit3 Final ground return pulse selection parameter Number float64 0 0 to 4096 N/A
amp_thresh Final ground return pulse selection parameter Number float64 N/A N/A to 4096 N/A
back_threshold Threshold used to detect lowest elevation return energy Number float32 N/A N/A to 4096 N/A
beam Beam identifier N/A uint16 N/A N/A to 12 N/A
botloc Waveform sample location of lowest detected return energy relative to bin0 of waveform Number float32 N/A N/A to 1420 N/A
botlocdist_limit1 Final ground return pulse selection parameter Nanoseconds float64 0 0 to 50 N/A
botlocdist_limit2 Final ground return pulse selection parameter Nanoseconds float64 0 0 to 50 N/A
botlocdist_limit3 Final ground return pulse selection parameter Nanoseconds float64 0 0 to 50 N/A
botloc_amp Amplitude at lowest detected energy return Number float32 N/A N/A to 4096 N/A
channel Channel identifier N/A uint8 N/A N/A to 6 N/A
cumulative_energy_minimum Final ground return pulse selection parameter Number float64 0 0 to 1 N/A
cumulative_energy_thresh Final ground return pulse selection parameter Number float64 0 0 to 1 N/A
degrade_flag Flag indicating degraded state of pointing and/or positioning information N/A uint8 N/A N/A to 1 N/A
delta_time Time delta since Jan 1 00:00 2018 Seconds float64 N/A N/A N/A
digital_elevation_model TanDEM-X elevation at GEDI footprint location Meters float32 N/A N/A N/A
elevation_1gfit Elevation corresponding to the center of a single Gaussian fit to the waveform, relative to reference ellipsoid Meters float32 N/A N/A to 25000 N/A
elevation_bias_flag Elevations potentially affected by 4bin (~60 cm) ranging error N/A uint8 N/A N/A to 1 N/A
elevation_bin0_error Error in elevation of bin 0 Meters float32 N/A N/A to 25000 N/A
elevs_allmodes_aN Elevations of all modes detected using algorithm N, relative to reference ellipsoid. This Variable record represents elevs_allmodes_a1 through elevs_allmodes_a6. Meters float32 N/A N/A to 25000 N/A
elev_highestreturn Elevation of highest detected return relative to reference ellipsoid Meters float32 N/A N/A to 25000 N/A
elev_highestreturn_aN Elevation of the highest return detected using algorithm N, relative to reference ellipsoid. This Variable record represents elev_highestreturn_a1 through elev_highestreturn_a6. Meters float32 N/A N/A to 25000 N/A
elev_lowestmode Elevation of center of lowest mode relative to reference ellipsoid Meters float32 N/A N/A to 25000 N/A
elev_lowestmode_aN Elevation of the center of the lowest mode detected using algorithm N, relative to reference ellipsoid. This Variable record represents elev_lowestmode_a1 through elev_lowestmode_a6. Meters float32 N/A N/A to 25000 N/A
elev_lowestreturn_aN Elevation of lowest return detected using algorithm N, relative to reference ellipsoid. This Variable record represents elev_lowestreturn_a1 through elev_lowestreturn_a6. Meters float32 N/A N/A to 25000 N/A
enable_select_mode Final ground return pulse selection parameter N/A int32 0 0 to 1 N/A
energy_lowestmode_aN Energy of lowest mode, detected using algorithm N, in the waveform above the mean noise level. This Variable record represents energy_lowestmode_a1 through energy_lowestmode_a6. Number float32 N/A N/A to 5000000 N/A
energy_sm Total energy of smoothed waveform Number float32 N/A N/A to 100000 N/A
energy_thresh Final ground return pulse selection parameter Number float64 0 0 to 1000 N/A
energy_total Integrated counts in the return waveform relative to the mean noise level Number float32 N/A N/A to 5000000 N/A
front_threshold Threshold used to detect highest elevation return energy Number float32 N/A N/A to 4096 N/A
l2a_alg_count Number of L2A algorithm runs present in file N/A uint8 N/A N/A to 10 N/A
landsat_treecover Tree cover in the year 2010, defined as canopy closure for all vegetation taller than 5 m in height as a percentage per output grid cell Percent float64 -9999 -9999 N/A
lastmodeenergy Energy in lowest detected mode Number float32 N/A N/A to 100000 N/A
latitude_1gfit Latitude corresponding to the center of a single Gaussian fit to the waveform Degree float64 N/A N/A to 55 N/A
latitude_bin0_error Error in latitude of bin 0 Degree float32 N/A N/A N/A
lats_allmodes_aN Latitudes of all modes detected using algorithm N. This Variable record represents lats_allmodes_a1 through lats_allmodes_a6. Degree float64 N/A N/A to 55 N/A
lat_highestreturn Latitude of highest detected return Degree float64 N/A N/A to 55 N/A
lat_highestreturn_aN Latitude of the highest return detected using algorithm N. This Variable record represents lat_highestreturn_a1 thorugh lat_highestreturn_a6. Degree float64 N/A N/A to 55 N/A
lat_lowestmode Latitude of center of lowest mode Degree float64 N/A N/A to 55 N/A
lat_lowestmode_aN Latitude of the center of the lowest mode detected using algorithm N. This Variable record represents lat_lowestmode_a1 through lat_lowestmode_a6. Degree float64 N/A N/A to 55 N/A
lat_lowestreturn_aN Latitude of the lowest return detected using algorithm N. This Variable record represents lat_lowestreturn_a1 through lat_lowestreturn_a6. Degree float64 N/A N/A to 55 N/A
longitude_1gfit Longitude corresponding to the center of a single Gaussian fit to the waveform Degree float64 N/A N/A to 180 N/A
longitude_bin0_error Error on longitude_bin0 Degree float32 N/A N/A N/A
lons_allmodes_aN Longitudes of all modes detected using algorithm N. This Variable record represents lons_allmodes_a1 through lons_allmodes_a6. Degree float64 N/A N/A to 180 N/A
lon_highestreturn Longitude of highest detected return Degree float64 N/A N/A to 180 N/A
lon_highestreturn_aN Longitude of the highest return detected using algorithm N. This Variable record represents lon_highestreturn_a1 through lon_highestreturn_a6. Degree float64 N/A N/A to 180 N/A
lon_lowestmode Longitude of center of lowest mode Degree float64 N/A N/A to 180 N/A
lon_lowestmode_aN Longitude of the center of lowest mode detected using algorithm N. This Variable record represents lon_lowestmode_a1 through lon_lowestmode_a6. Degree float64 N/A N/A to 180 N/A
lon_lowestreturn_aN Longitude of lowest return detected using algorithm N. This Variable record represents lon_lowestreturn_a1 through lon_lowestreturn_a6. Degree float64 N/A N/A to 180 N/A
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