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Description

GEDI Version 1 data products were decommissioned on February 15, 2022. Users are advised to use the improved GEDI01_B 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 GEDI Level 1B Geolocated Waveforms product (GEDI01_B) provides geolocated corrected and smoothed waveforms, geolocation parameters, and geophysical corrections for each laser shot for all eight GEDI beams. GEDI01_B data are created by geolocating the GEDI01_A raw waveform data. The GEDI01_B product is provided in HDF5 format and has a spatial resolution (average footprint) of 25 meters.

The GEDI01 B data product contains 83 variables for each of the eight beams including the geolocated corrected and smoothed waveform datasets and parameters and the accompanying ancillary, geolocation, and geophysical correction. Additional information can be found in the GEDI L1B Product Data Dictionary.

Known Issues

  • Known Issues: Section 6.1 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.

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
C2141081749-LPCLOUD
Data State
DEPRECATED
Number of Files/Granules
0
Processing Level
1B
Published
Updated
Science Keywords
Topography ,
Lidar ,
LIDAR WAVEFORM

File Naming Convention

GEDI01_B_2019247234534_O04132_T02215_02_003_01.h5

The file name begins with the Product Short Name (GEDI01_B), followed by the Julian Date and Time of Acquisition designated as YYYYDDDHHMMSS (2019247234534), the Orbit Number starting with the letter O (O04132), Track Number (T02215), the Positioning and Pointing Determination System type where 00 is predict, 01 rapid, 02 and higher is final (02), the Software Release Number (003), the Granule Production Version (01), and the Data Format (h5).

Documents

Publications Citing This Dataset

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
all_samples_sum Sum of all values within the 10 km range window Number uint32 N/A N/A N/A
altitude_instrument Height of the instrument diffractive optical element (DOE) above the WGS84 ellipsoid Meters float64 N/A N/A N/A
altitude_instrument_error Error on altitude_instrument Meters float32 N/A N/A N/A
beam Beam number Number uint16 N/A 0 to 15 N/A
bounce_time_offset_bin0 The difference between the TX time and the time at the start of the RX window Seconds float64 N/A N/A N/A
bounce_time_offset_bin0_error Error on bounce_time_offset_bin0 Seconds float32 N/A N/A N/A
bounce_time_offset_lastbin The difference between the TX time and the time at the end of the RX window Seconds float64 N/A N/A N/A
bounce_time_offset_lastbin_error Error on bounce_time_offset_lastbin Seconds float64 N/A N/A N/A
channel Channel number Number uint8 N/A 0 to 7 N/A
degrade Greater than zero if the shot occurs during a degrade period, zero otherwise Class Flag int8 N/A N/A N/A
delta_time Transmit time of the shot Seconds float64 N/A N/A N/A
digital_elevation_model Digital elevation model height above the WGS84 ellipsoid Meters float32 -9999 N/A N/A
dynamic_atmosphere_correction Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect Meters float32 N/A N/A N/A
elevation_bin0 Height of the start of the RX window, relative to the WGS-84 ellipsoid Meters float64 N/A N/A N/A
elevation_bin0_error Error on elevation_bin0 Meters float32 N/A N/A N/A
elevation_lastbin Height of the end of the RX window, relative to the WGS-84 ellipsoid Meters float64 N/A N/A N/A
elevation_lastbin_error Error on elevation_lastbin Meters float32 N/A N/A N/A
geoid Geoid height above WGS-84 reference ellipsoid Meters float32 N/A -107 to 86 N/A
latitude_bin0 Latitude of the start of the RX window Degree float64 N/A N/A N/A
latitude_bin0_error Error on latitude_bin0 Degree float32 N/A N/A N/A
latitude_instrument Latitude of the instrument diffractive optical element (DOE) at laser transmit time Degree float64 N/A N/A N/A
latitude_instrument_error Error on latitude_instrument Degree float32 N/A N/A N/A
latitude_lastbin Latitude of the end of the RX window Degree float64 N/A N/A N/A
latitude_lastbin_error Error on latitude_lastbin Degree float32 N/A N/A N/A
local_beam_azimuth Azimuth of the unit pointing vector for the laser in the local East, North, Up (ENU) frame Radians float32 N/A N/A N/A
local_beam_azimuth_error Error on local_beam_azimuth Radians float32 N/A N/A N/A
local_beam_elevation Elevation of the unit pointing vector for the laser in the local ENU frame Radians float32 N/A N/A N/A
local_beam_elevation_error Error on local_beam_elevation Radians float32 N/A N/A N/A
longitude_bin0 Longitude of the start of the RX window Degree float64 N/A N/A N/A
longitude_bin0_error Error on longitude_bin0 Degree float32 N/A N/A N/A
longitude_instrument Longitude of the instrument diffractive optical element (DOE) at laser transmit time Degree float64 N/A N/A N/A
longitude_instrument_error Error on longitude_instrument Degree float32 N/A N/A N/A
longitude_lastbin Longitude of the end of the RX window Degree float64 N/A N/A N/A
longitude_lastbin_error Error on longitude_lastbin Degree float32 N/A N/A N/A
master_frac Master time, fractional part Seconds float64 N/A N/A N/A
master_int Master time, integer part Seconds uint32 N/A N/A N/A
master_time_epoch Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00Z) and the GEDI epoch (2018-01-01T00:00:00Z) Seconds float64 N/A N/A N/A
mean_samples Averaging window (shots) for non-repeated odd-even measurements from housekeeping Number int64 N/A 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
neutat_delay_derivative_bin0 Change in neutral atmospheric delay per height change for the start of the RX window m/m float32 N/A N/A N/A
neutat_delay_derivative_lastbin Change in neutral atmospheric delay per height change for the end of the RX window m/m float32 N/A N/A N/A
neutat_delay_total_bin0 Total neutral atmosphere delay correction (wet+dry) from the TX pulse tothe start of the RX window Meters float32 N/A N/A N/A
neutat_delay_total_lastbin Total neutral atmosphere delay correction (wet+dry) from the TX pulse tothe end of the RX window Meters float32 N/A N/A N/A
noise_mean_corrected Noise mean Number float64 N/A N/A N/A
noise_stddev_corrected Corrected noise standard deviation Number float64 N/A N/A N/A
nsemean_even Noise mean of the beam's detector channel from even sub-converter Number float32 N/A N/A N/A
nsemean_odd Noise mean of the beam's odd sub-converter Number float32 N/A N/A N/A
range_bias_correction The range bias applied to the range measurement Meters float32 N/A N/A N/A
rxwaveform The corrected receive RX waveforms using rx_sample_count and rx_sample_start_index to identify the location of each waveform Number float32 N/A N/A N/A
rx_energy Integrated energy in receive (RX) waveform after subtracting the noise mean Nanoseconds float64 N/A N/A N/A
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