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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).

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
C2141085552-LPCLOUD
Data State
DEPRECATED
Number of Files/Granules
0
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).

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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
master_frac Master time, fractional part Seconds float64 N/A N/A N/A N/A
master_int Master time, integer part Seconds uint32 N/A N/A N/A N/A
mean Mean noise level used in algorithm Number float32 N/A 0 to 4096 N/A N/A
mean_64kadjusted Average amplitude within 10 km search window with energy from rxwaveform removed Number float32 N/A 0 to 1000000 N/A N/A
mean_sea_surface Mean sea surface height above the WGS84 ellipsoid, includes the geoid Meters float32 N/A N/A N/A N/A
mean_sm Mean noise level after smoothing Number float32 N/A 0 to 4096 N/A N/A
min_detection_energy Integrated area of the computed minimally-detectable Gaussian Number float32 N/A -1000 to 100000 N/A N/A
min_detection_threshold Detection threshold used to compute the minimally detected gaussian Number float32 N/A 0 to 1420 N/A N/A
modis_nonvegetated Percent non-vegetated from MODIS MOD44B V6 data Percent float64 -9999 N/A N/A N/A
modis_nonvegetated_sd Percent non-vegetated standard deviation from MODIS MOD44B V6 data Percent float64 -9999 N/A N/A N/A
modis_treecover Percent tree cover from MODIS MOD44B V6 data Percent float64 -9999 N/A N/A N/A
modis_treecover_sd Percent tree cover standard deviation from MODIS MOD44B V6 data Percent float64 -9999 N/A N/A N/A
mpfit_maxiters Maximum number of iterations allowed for fitting the Gaussian/extended Gaussian to the rxwaveform N/A int64 N/A 0 to 100 N/A N/A
mpfit_max_func_evals Maximum number of function evalutions allowed for fitting the Gaussian/extended Gaussian to the rxwaveform N/A int64 N/A 0 to 100 N/A N/A
mpfit_tolerance Convergence tolerance when fitting the Gaussian/extended Gaussian to the rxwaveform N/A float64 N/A 0 to 1 N/A N/A
num_detectedmodes Number of detected modes in rxwaveform N/A uint8 N/A N/A N/A N/A
num_detectedmodes_aN Number of detected modes detected using algorithm N. This Variable record represents num_detectedmodes_a1 through num_detectedmodes_a6. N/A uint8 N/A 0 to 20 N/A N/A
ocean_calibration_shot_flag Flag indicating return suitable for use in sensor parameter estimation Class Flag uint8 N/A 0 to 1 N/A N/A
peak Peak amplitude of raw waveform Number float32 N/A -100 to 1420 N/A N/A
pk_sm Peak ampltiude of smoothed waveform Number float32 N/A -100 to 1420 N/A N/A
preprocessor_threshold Initial search threshold multiplier to detect signal start and end N/A float64 0 0 to 100 N/A N/A
pulse_sep_thresh Final ground return pulse selection parameter Nanoseconds float64 0 0 to 100 N/A N/A
quality_flag Flag indicating likely invalid waveform (1=valid, 0=invalid) Quality Flag uint8 N/A 0 to 1 N/A N/A
quality_flag_aN Flag simplifying selection of most useful data. This Variable record represents quality_flag_a1 through quality_flag_a6. Quality Flag uint8 N/A 0 to 1 N/A N/A
rh Relative height metrics at 1% interval cm float32 N/A -213 to 213 N/A N/A
rh_aN Relative height metrics at 1% intervals using algorithm N. This Variable record represents rh_a1 through rh_a6. cm int16 N/A -213 to 213 N/A N/A
rx_algrunflag Flag indicating signal was detected and algorithm ran successfully Class Flag uint8 N/A 0 to 1 N/A N/A
rx_ampbounds_ll Lower limit used for pulse amplitude flag Number float64 N/A 0 to 4096 N/A N/A
rx_ampbounds_ul Upper limit used for pulse amplitude flag Number float64 N/A 0 to 4096 N/A N/A
rx_assess_flag Flags indicating various error conditions possible in rxwaveform Class Flag uint16 N/A 0 to 1 N/A N/A
rx_back_threshold Noise stddev multiplier used to detect the lowest elevation signal N/A float64 0 0 to 100 N/A N/A
rx_clipamp Ampltiude above which clipping may occur Number float64 N/A 0 to 4096 N/A N/A
rx_clipbin0 Location of first waveform sample exceeding clip amplitude Number uint16 N/A 0 to 1420 N/A N/A
rx_clipbin_count Number of consecutive waveform samples affected by clipping Number uint16 N/A 0 to 1420 N/A N/A
rx_constraint_gamplitude_lower Lower allowable limit for the RX Gaussian fit amplitude Number float64 N/A 0 to 4096 N/A N/A
rx_constraint_gamplitude_upper Upper allowable limit for the RX Gaussian fit amplitude Number float64 N/A 0 to 4096 N/A N/A
rx_constraint_gloc_lower Lower allowable limit for the RX Gaussian fit location Nanoseconds float64 N/A 0 to 1420 N/A N/A
rx_constraint_gloc_upper Upper allowable limit for the RX Gaussian fit location Nanoseconds float64 N/A 0 to 1420 N/A N/A
rx_constraint_gwidth_lower Lower allowable limit for the RX Gaussian fit width Nanoseconds float64 N/A 0 to 1000 N/A N/A
rx_constraint_gwidth_upper Upper allowable limit for the RX Gaussian fit width Nanoseconds float64 N/A 0 to 1000 N/A N/A
rx_cumulative Waveform bin numbers of integer percents of integrated energy from cumulative waveform Nanoseconds float32 N/A 0 to 1420 N/A N/A
rx_energy Total energy of rxwaveform, mean noise removed Number float32 N/A -1000 to 1000000 N/A N/A
rx_estimate_bias If set to 1, a bias was estimated as part of the Gaussian fit; set to 0 otherwise N/A int32 N/A 0 to 1 N/A N/A
rx_front_threshold Noise stddev multiplier used to detect the highest elevation signal N/A float64 0 0 to 100 N/A N/A
rx_gamplitude Amplitude of single Gaussian fit to the rxwaveform Number float32 N/A 0 to 4096 N/A N/A
rx_gamplitude_error Error in ampltiude estimate for single Gaussian fit to the rxwaveform Number float32 N/A 0 to 4096 N/A N/A
rx_gbias Bias estimated in fitting a single Gaussian to the rxwaveform Number float32 N/A 0 to 350 N/A N/A
rx_gbias_error Error on rx_gbias parameter estimate Number float32 N/A 0 to 350 N/A N/A
rx_gchisq Chi-squared value of Gaussian fit to the rxwaveform N/A float32 N/A 0 to 10000 N/A N/A
rx_gflag Gaussian fit status flag (no further improvement) Class Flag uint8 N/A 0 to 9 N/A N/A
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