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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).

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
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

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
rx_offset Time interval from first stored sample to first downloaded RX sample Nanoseconds uint16 N/A N/A N/A N/A
rx_open Time interval from time 0 to first stored RX sample Nanoseconds uint32 N/A N/A N/A N/A
rx_sample_count The number of sample intervals (elements) in each RX waveform Number uint16 N/A N/A N/A N/A
rx_sample_start_index The index in the rxwaveform dataset of the first element of each RX waveform starting at 1 Number uint64 N/A N/A N/A N/A
selection_stretchers_x Commanded number of samples added to algorithm section on the left Nanoseconds uint16 N/A N/A N/A N/A
selection_stretchers_y Commanded number of samples added to algorithm section on the right Nanoseconds uint16 N/A N/A N/A N/A
shot_number Unique shot identifier Number uint64 N/A N/A N/A N/A
smoothing_width The 1-sigma width of the gaussian kernel used to smooth the corrected waveform Nanoseconds float64 N/A N/A N/A N/A
solar_azimuth The azimuth of the sun position vector Degree float32 N/A N/A N/A N/A
solar_elevation The elevation of the sun position vector Degree float32 N/A N/A N/A N/A
stale_return_flag Indicates that a "stale" cue point from the coarse search algorithm is being used Class Flag uint8 N/A N/A N/A N/A
surface_type Flags describing which surface types Class Flag int8 N/A N/A N/A N/A
th_left_used Count values for left threshold used in fine search where two consecutive points at or above this value indicates pulse detection Number uint16 N/A N/A N/A N/A
tide_earth Solid Earth tides Meters float32 N/A N/A N/A N/A
tide_load Load Tide - Local displacement due to Ocean Loading cm float32 N/A -6 0 0.01 N/A
tide_ocean Ocean Tides including diurnal and semi-diurnal, and longerperiod tides Meters float32 N/A N/A N/A N/A
tide_ocean_pole Oceanic surface rotational deformation due to polar motion mm float32 N/A -2 to 2 N/A N/A
tide_pole Solid Earth Pole Tide -- Rotational deformation due to polar motion cm float32 N/A -1.5 to 1.5 N/A N/A
txwaveform The corrected TX waveforms using tx_sample_count and tx_sample_start_index to identify the location of each waveform Number float32 N/A N/A N/A N/A
tx_egamplitude Amplitude of the extended Gaussian fit to the transmit (TX) waveform Number float64 N/A N/A N/A N/A
tx_egamplitude_error Error on tx_egamplitude Number float32 N/A N/A N/A N/A
tx_egbias Bias of the extended Gaussian fit to the TX waveform Number float32 N/A N/A N/A N/A
tx_egbias_error Error on tx_egbias Number float32 N/A N/A N/A N/A
tx_egflag Extended Gaussian fit status flag Class Flag uint8 N/A 1 to 8 N/A N/A
tx_eggamma Gamma value of the extended Gaussian fit to the TX waveform N/A float32 N/A N/A N/A N/A
tx_eggamma_error Error on tx_eggamma N/A float32 N/A N/A N/A N/A
tx_egsigma Sigma of the extended Gaussian fit to the TX waveform Nanoseconds float32 N/A N/A N/A N/A
tx_egsigma_error Error on tx_egsigma Nanoseconds float32 N/A N/A N/A N/A
tx_gloc Location (mean) of the Gaussian fit to the TX waveform Nanoseconds float32 N/A N/A N/A N/A
tx_gloc_error Error on tx_gloc Nanoseconds float32 N/A N/A N/A N/A
tx_pulseflag Set to 1 if a pulse is detected in the TX waveform Class Flag uint8 N/A N/A N/A N/A
tx_sample_count The number of sample intervals (elements) in each transmit waveform Number uint16 N/A N/A N/A N/A
tx_sample_start_index The index in the rxwaveform dataset of the first element of each RX waveform starting at 1 Number uint64 N/A N/A N/A N/A
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