| Dimension Variable | Description |
|---|---|
| MT | Number of shots |
| AV | Number of average waveform groups |
| Group: / | |||||||
| short_name | (Attribute) | GEDI_L1B | ${DESCRIPTION} | ||||
| Group: /METADATA/DatasetIdentification | |||||||
| abstract | (Attribute) | The GEDI L1A and L1B standard data product contains precise latitude, longitude, and height above the reference ellipsoid of the laser shot received bounce point for all laser shots. Geophysical corrections are applied to the surface return values for each laser shot. Geophysical corrections, atmospheric corrections, and the surface types are provided for each laser shot. | ${DESCRIPTION} | ||||
| characterSet | (Attribute) | utf8 | ${DESCRIPTION} | ||||
| creationDate | (Attribute) | File creation date | |||||
| credit | (Attribute) | The software that generates the L1B product was designed and implemented within the GEDI Science Data Processing System at the NASA Goddard Space Flight Center in Greenbelt, Maryland. | ${DESCRIPTION} | ||||
| fileName | (Attribute) | Original file name | |||||
| language | (Attribute) | eng | ${DESCRIPTION} | ||||
| originatorOrganizationName | (Attribute) | GSFC GEDI-SDPS > GEDI Science Data Processing System | ${DESCRIPTION} | ||||
| PGEVersion | (Attribute) | Production software version ID | |||||
| purpose | (Attribute) | The purpose of the L1B dataset is to provide geolocated waveforms and supporting datasets for each laser shot for all eight GEDI beams. This includes corrected and smoothed waveforms, geolocation parameters, and geophysical corrections. | ${DESCRIPTION} | ||||
| shortName | (Attribute) | GEDI_L1B | ${DESCRIPTION} | ||||
| spatialRepresentationType | (Attribute) | along-track | ${DESCRIPTION} | ||||
| status | (Attribute) | onGoing | ${DESCRIPTION} | ||||
| topicCategory | (Attribute) | geoscientificInformation | ${DESCRIPTION} | ||||
| uuid | (Attribute) | Universally unique identifier (UUID) for this file | |||||
| VersionID | (Attribute) | Release data product version ID | |||||
| Group: /BEAMXXXX | |||||||
| description | (Attribute) | "Coverage beam" or "Full power beam" | |||||
| Label | Datatype (Dimensions) |
long_name | units source |
description | |||
| all_samples_sum | UINT32 (MT) |
All samples sum | counts from the ADC (Analog-to-Digital Converter) L0B |
Sum of all values within the 10 km range window. | delta_time | ||
| beam | UINT16 (MT) |
Beam | counter Derived |
Beam number (0-15). | delta_time | ||
| channel | UINT8 (MT) |
Channel | counter L0B |
Channel number (0-7). | delta_time | ||
| master_frac | FLOAT64 (MT) |
Master time fractional seconds | seconds Derived |
Master time, fractional part. master_int+master_frac is equivalent to /BEAMXXXX/geolocation/delta_time and /BEAMXXXX/geophys_corr/delta_time. | |||
| master_int | UINT32 (MT) |
Master time integer seconds | seconds Derived |
Master time, integer part. Seconds since master_time_epoch. master_int+master_frac is equivalent to /BEAMXXXX/geolocation/delta_time and /BEAMXXXX/geophys_corr/delta_time. | |||
| noise_mean_corrected | FLOAT64 (MT) |
Noise mean | counts from the ADC (Analog-to-Digital Converter) L0B |
Noise mean. | delta_time | ||
| noise_stddev_corrected | FLOAT64 (MT) |
Standard deviation | counts from the ADC Derived |
Corrected noise standard deviation. | delta_time | ||
| nsemean_even | FLOAT64 (MT) |
Noise mean even | counts from the ADC Instrument housekeeping |
Noise mean of the beam's detector channel from even sub-converter. | delta_time | ||
| nsemean_odd | FLOAT64 (MT) |
Noise mean odd | counts from the ADC Instrument housekeeping |
Noise mean of the beam's odd sub-converter. | delta_time | ||
| rx_energy | FLOAT64 (MT) |
RX energy | sample number (~1ns) multiplied by counts from the ADC Derived |
Integrated energy in RX waveform after subtracting the noise mean. | delta_time | ||
| rx_offset | UINT16 (MT) |
RX offset | sample intervals (~1 ns) L0B |
Time interval from first stored sample to first downloaded RX sample (1ns resolution). | delta_time | ||
| rx_open | UINT32 (MT) |
RX open | sample intervals (~1 ns) L0B |
Time interval from t0 to first stored RX sample (4ns resolution). | delta_time | ||
| rx_sample_count | UINT16 (MT) |
RX sample count | sample intervals L0B |
The number of sample intervals (elements) in each RX waveform. | delta_time | ||
| rx_sample_start_index | UINT64 (MT) |
RX sample start index | index (origin 1) Derived |
The index in the rxwaveform dataset of the first element of each RX waveform. The indices start at 1. | delta_time | ||
| rxwaveform | FLOAT32 (UNLIMITED) |
RX waveform | counts from the ADC Derived |
The corrected receive (RX) waveforms. Use rx_sample_count and rx_sample_start_index to identify the location of each waveform. | |||
| selection_stretchers_x | UINT16 (MT) |
Selection stretchers X | sample intervals (~1 ns) L0B |
Commanded number of samples added to algo section on the left. | delta_time | ||
| selection_stretchers_y | UINT16 (MT) |
Selection stretchers Y | sample intervals (~1 ns) L0B |
Commanded number of samples added to algo section on the right. | delta_time | ||
| shot_number | UINT64 (MT) |
Shot number | counter Derived |
Unique shot ID. | delta_time | ||
| stale_return_flag | UINT8 (MT) |
Stale return flag | boolean L0B |
Indicates that a "stale" cue point from the coarse search algorithm is being used. | delta_time | ||
| th_left_used | UINT16 (MT) |
Threshold fine left used | counts from the ADC L0B |
Count values for left threshold used in fine search. Two consecutive points at or above this value indicates pulse detection. | delta_time | ||
| tx_egamplitude | FLOAT64 (MT) |
TX extended Gaussian amplitude | counts from the ADC Derived |
Amplitude of the extended Gaussian fit to the TX waveform. | delta_time | ||
| tx_egamplitude_error | FLOAT64 (MT) |
TX extended Gaussian amplitude error | counts from the ADC Derived |
Error on tx_egamplitude. | delta_time | ||
| tx_egbias | FLOAT64 (MT) |
TX extended Gaussian bias | counts from the ADC Derived |
Bias of the extended Gaussian fit to the TX waveform. | delta_time | ||
| tx_egbias_error | FLOAT64 (MT) |
TX extended Gaussian bias error | counts from the ADC Derived |
Error on tx_egbias. | delta_time | ||
| tx_egflag | INT32 (MT) |
TX extended Gaussian flag | flag Derived |
Extended Gaussian fit status flag. 1=convergence in chi2 value, 2=convergence in parameter value, 3=convergence in chi2 and parameter values, 4=convergence in orthogonality, 5=maximum number of iterations reached, 6=ftol too small (no further improvement), 7=xtol too small (no further improvement), 8=gtol too small (no further improvement). | delta_time | ||
| tx_eggamma | FLOAT64 (MT) |
TX extended Gaussian gamma | N/A Derived |
Gamma value of the extended Gaussian fit to the TX waveform. | delta_time | ||
| tx_eggamma_error | FLOAT64 (MT) |
TX extended Gaussian gamma error | N/A Derived |
Error on tx_eggamma. | delta_time | ||
| tx_egsigma | FLOAT64 (MT) |
TX extended Gaussian sigma | sample intervals (~1 ns) Derived |
Sigma of the extended Gaussian fit to the TX waveform. | delta_time | ||
| tx_egsigma_error | FLOAT64 (MT) |
TX extended Gaussian sigma error | sample intervals (~1 ns) Derived |
Error on tx_egsigma. | delta_time | ||
| tx_gloc | FLOAT64 (MT) |
TX Gaussian location | sample intervals (~1 ns) Derived |
Location (mean) of the Gaussian fit to the TX waveform. | delta_time | ||
| tx_gloc_error | FLOAT64 (MT) |
TX Gaussian location error | sample intervals (~1 ns) Derived |
Error on tx_gloc. | delta_time | ||
| tx_pulseflag | INT32 (MT) |
TX pulse flag | boolean Derived |
Set to 1 if a pulse is detected in the TX waveform. | delta_time | ||
| tx_sample_count | UINT16 (MT) |
TX sample count | sample intervals Derived |
The number of sample intervals (elements) in each TX waveform. | delta_time | ||
| tx_sample_start_index | UINT64 (MT) |
TX sample start index | index (origin 1) Derived |
The index in the rxwaveform dataset of the first element of each RX waveform. The indices start at 1. | delta_time | ||
| txwaveform | FLOAT32 (UNLIMITED) |
TX waveform | counts from the ADC Derived |
The corrected transmit (TX) waveforms. Use tx_sample_count and tx_sample_start_index to identify the location of each waveform. | |||
| Group: /BEAMXXXX/ancillary | |||||||
| Label | Datatype (Dimensions) |
long_name | units source |
description | |||
| master_time_epoch | FLOAT64 (1) |
Master time epoch | seconds |
Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00Z) and the GEDI epoch (2018-01-01T00:00:00Z). Add this value to delta_time parameters to compute full GPS seconds (relative to the GPS epoch) for each data point. | |||
| mean_samples | INT64 (1) |
Mean samples | shots Configuration |
Averaging window (shots) for non-repeated odd-even measurements from housekeeping. | |||
| smoothing_width | FLOAT64 (1) |
Smoothing width | sample intervals (~1 ns) Configuration |
The 1-sigma width (nsec) of the gaussian kernel used to smooth the corrected waveform. | |||
| Group: /BEAMXXXX/geolocation | |||||||
| description | (Attribute) | Geolocation | ${DESCRIPTION} | ||||
| vegas_githash | (Attribute) | Git commit hash of the VEGAS software used to create the L1B file | |||||
| vegas_version | (Attribute) | Version number of the VEGAS software used to create the L1B file | |||||
| Label | Datatype (Dimensions) |
long_name | units source |
description | |||
| altitude_instrument | FLOAT64 (MT) |
Instrument altitude | meters Derived |
Height of the instrument diffractive optical element (DOE) above the WGS84 ellipsoid. | delta_time latitude_instrument longitude_instrument | delta_time | |
| altitude_instrument_error | FLOAT64 (MT) |
Instrument altitude error | meters Derived |
Error on altitude_instrument. | delta_time latitude_instrument longitude_instrument | delta_time | |
| bounce_time_offset_bin0 | FLOAT64 (MT) |
Bounce time offset bin 0 | seconds Derived |
The difference between the transmit time and the time at the start of the RX window | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| bounce_time_offset_bin0_error | FLOAT64 (MT) |
Bounce time offset bin 0 error | seconds Derived |
Error on bounce_time_offset_bin0. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| bounce_time_offset_lastbin | FLOAT64 (MT) |
Bounce time offset last bin | seconds Derived |
The difference between the transmit time and the time at the end of the RX window | delta_time latitude_lastbin longitude_lastbin | delta_time | |
| bounce_time_offset_lastbin_error | FLOAT64 (MT) |
Bounce time offset last bin error | seconds Derived |
Error on bounce_time_offset_lastbin. | delta_time latitude_lastbin longitude_lastbin | delta_time | |
| degrade | INT8 (MT) |
Degrade | flag Derived |
Greater than zero if the shot occurs during a degrade period, zero otherwise. | delta_time | ||
| delta_time | FLOAT64 (MT) |
Delta time | seconds since 2018-01-01 Derived |
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. | delta_time latitude_bin0 longitude_bin0 | ||
| digital_elevation_model | FLOAT64 (MT) |
Digital elevation model | meters TanDEM-X DEM |
Digital elevation model height above the WGS84 ellipsoid. Interpolated at latitude_bin0 and longitude_bin0 from the TandemX 90m product. | delta_time latitude_bin0 longitude_bin0 | delta_time | -999999.0 |
| elevation_bin0 | FLOAT64 (MT) |
Bounce elevation bin 0 | meters Derived |
Height of the start of the RX window, relative to the WGS-84 ellipsoid. Includes corrections due to the range bias, atmospheric path delay, solid Earth tides, ocean loading, ocean pole tide, and solid Earth pole tide. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| elevation_bin0_error | FLOAT64 (MT) |
Bounce elevation bin 0 error | meters Derived |
Error on elevation_bin0. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| elevation_lastbin | FLOAT64 (MT) |
Bounce elevation last bin | meters Derived |
Height of the end of the RX window, relative to the WGS-84 ellipsoid. Includes corrections due to the range bias, atmospheric path delay, solid Earth tides, ocean loading, ocean pole tide, and solid Earth pole tide. | delta_time latitude_lastbin longitude_lastbin | delta_time | |
| elevation_lastbin_error | FLOAT64 (MT) |
Bounce elevation last bin error | meters Derived |
Error on elevation_lastbin. | delta_time latitude_lastbin longitude_lastbin | delta_time | |
| latitude_bin0 | FLOAT64 (MT) |
Bounce latitude bin 0 | degrees Derived |
Latitude of the start of the RX window. | delta_time longitude_bin0 | delta_time | |
| latitude_bin0_error | FLOAT64 (MT) |
Bounce latitude bin 0 error | degrees Derived |
Error on latitude_bin0. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| latitude_lastbin | FLOAT64 (MT) |
Bounce latitude last bin | degrees Derived |
Latitude of the end of the RX window. | delta_time longitude_lastbin | delta_time | |
| latitude_lastbin_error | FLOAT64 (MT) |
Bounce latitude last bin error | degrees Derived |
Error on latitude_lastbin. | delta_time latitude_lastbin longitude_lastbin | delta_time | |
| latitude_instrument | FLOAT64 (MT) |
Instrument latitude | degrees Derived |
Latitude of the instrument diffractive optical element (DOE) at laser transmit time. | delta_time | ||
| latitude_instrument_error | FLOAT64 (MT) |
Instrument latitude error | degrees Derived |
Error on latitude_instrument. | delta_time | ||
| local_beam_azimuth | FLOAT64 (MT) |
Local beam azimuth | radians Derived |
Azimuth of the unit pointing vector for the laser in the local ENU frame. The angle is measured from North and positive towards East. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| local_beam_azimuth_error | FLOAT64 (MT) |
Local beam azimuth error | radians Derived |
Error on local_beam_azimuth. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| local_beam_elevation | FLOAT64 (MT) |
Local beam elevation | radians Derived |
Elevation of the unit pointing vector for the laser in the local ENU frame. The angle is measured from East-North plane and positive towards Up. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| local_beam_elevation_error | FLOAT64 (MT) |
Local beam elevation error | radians Derived |
Error on local_beam_elevation. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| longitude_bin0 | FLOAT64 (MT) |
Bounce longitude bin 0 | degrees Derived |
Longitude of the start of the RX window. | delta_time latitude_bin0 | delta_time | |
| longitude_bin0_error | FLOAT64 (MT) |
Bounce longitude bin 0 error | degrees Derived |
Error on longitude_bin0. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| longitude_lastbin | FLOAT64 (MT) |
Bounce longitude last bin | degrees Derived |
Longitude of the end of the RX window. | delta_time latitude_lastbin | delta_time | |
| longitude_lastbin_error | FLOAT64 (MT) |
Bounce longitude last bin error | degrees Derived |
Error on longitude_lastbin. | delta_time latitude_lastbin longitude_lastbin | delta_time | |
| longitude_instrument | FLOAT64 (MT) |
Instrument longitude | degrees Derived |
Longitude of the instrument diffractive optical element (DOE) at laser transmit time. | delta_time | ||
| longitude_instrument_error | FLOAT64 (MT) |
Instrument longitude error | degrees Derived |
Error on longitude_instrument. | delta_time | ||
| mean_sea_surface | FLOAT64 (MT) |
Mean sea surface | meters DTU15 |
Mean sea surface height above the WGS84 ellipsoid, includes the geoid. Interpolated at latitude_bin0 and longitude_bin0 from DTU15. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| neutat_delay_derivative_bin0 | FLOAT64 (MT) |
(Neutral atmosphere delay)/dh bin 0 | meters/meter Derived |
Change in neutral atmospheric delay per height change for the start of the RX window. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| neutat_delay_derivative_lastbin | FLOAT64 (MT) |
(Neutral atmosphere delay)/dh last bin | meters/meter Derived |
Change in neutral atmospheric delay per height change for the end of the RX window. | delta_time latitude_lastbin longitude_lastbin | delta_time | |
| neutat_delay_total_bin0 | FLOAT64 (MT) |
Total neutral atmospheric delay bin 0 | meters Derived |
Total neutral atmosphere delay correction (wet+dry) from the TX pulse to the start of the RX window (computed according to ICESat-2 ATL03A ATDB). This value is subtracted from the range during geolocation. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| neutat_delay_total_lastbin | FLOAT64 (MT) |
Total neutral atmospheric delay last bin | meters Derived |
Total neutral atmosphere delay correction (wet+dry) from the TX pulse to the end of the RX window (computed according to ICESat-2 ATL03A ATDB). This value is subtracted from the range during geolocation. | delta_time latitude_lastbin longitude_lastbin | delta_time | |
| range_bias_correction | FLOAT32 (MT) |
Range bias correction | meters Derived |
The range bias applied to the range measurement. This value is subtracted from the range to get the corrected range. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| shot_number | FLOAT64 (MT) |
Shot number | counter Derived |
Unique shot ID. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| solar_azimuth | FLOAT32 (MT) |
Solar azimuth | degrees Derived |
The azimuth of the sun position vector from the laser bounce point position in the local ENU frame. The angle is measured from North and is positive towards East. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| solar_elevation | FLOAT32 (MT) |
Solar elevation | degrees Derived |
The elevation of the sun position vector from the laser bounce point position in the local ENU frame. The angle is measured from the East-North plane and is positive Up. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| surface_type | INT8 (5,MT) |
Surface type | boolean ICESat-2 surface type mask |
Flags describing which surface types this interval is associated with. 0=not type, 1=is type. Order of array is land, ocean, sea ice, land ice, inland water. | delta_time latitude_bin0 longitude_bin0 | delta_time | |
| Group: /BEAMXXXX/geophys_corr | |||||||
| description | (Attribute) | Geophysical corrections | ${DESCRIPTION} | ||||
| vegas_githash | (Attribute) | Git commit hash of the VEGAS software used to create the L1B file | |||||
| vegas_version | (Attribute) | Version number of the VEGAS software used to create the L1B file | |||||
| Label | Datatype (Dimensions) |
long_name | units source |
description | |||
| delta_time | FLOAT64 (MT) |
Delta time | seconds since 2018-01-01 Derived |
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. | |||
| dynamic_atmosphere_correction | FLOAT64 (MT) |
Dynamic atmosphere correction | meters MOG2D |
Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. | delta_time | ||
| geoid | FLOAT64 (MT) |
Geoid | meters Derived from EGM2008 |
Geoid height above WGS-84 reference ellipsoid (range -107 to 86m). Not applied on the product. | delta_time | ||
| tide_earth | FLOAT64 (MT) |
Earth tide | meters IERS conventions (2010) |
Solid Earth tides | delta_time | ||
| tide_load | FLOAT64 (MT) |
Load tide | meters GOT 4.8 |
Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm). | delta_time | ||
| tide_ocean | FLOAT64 (MT) |
Ocean tide | meters GOT 4.8 |
Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). | delta_time | ||
| tide_ocean_pole | FLOAT64 (MT) |
Ocean pole tide | meters IERS conventions (2010) |
Oceanic surface rotational deformation due to polar motion (-2 to 2 mm). | delta_time | ||
| tide_pole | FLOAT64 (MT) |
Solid earth pole tide | meters IERS conventions (2010) |
Solid Earth Pole Tide -- Rotational deformation due to polar motion (-1.5 to 1.5 cm). | delta_time | ||
| Group: /BEAMXXXX/land_surface_data | |||||||
| Label | Datatype (Dimensions) |
long_name | units source |
description | |||
| landsat_treecover | FLOAT64 (MT) |
Landsat tree canopy cover | percent Derived from treecover2010_v3 geotiff tiles |
Tree cover in the year 2010, defined as canopy closure for all vegetation taller than 5m in height (Hansen et al.). Encoded as a percentage per output grid cell. | ../geolocation/delta_time ../geolocation/latitude_bin0 ../geolocation/longitude_bin0 | delta_time | -9999.0 |
| modis_treecover | FLOAT64 (MT) |
MODIS tree cover | percent Derived from MODIS geotiff tiles |
Percent tree cover from MODIS data. Interpolated at latitude_bin0 and longitude_bin0. doi:10.5067/MODIS/MOD44B.006 | ../geolocation/delta_time ../geolocation/latitude_bin0 ../geolocation/longitude_bin0 | delta_time | -9999.0 |
| modis_treecover_sd | FLOAT64 (MT) |
MODIS tree cover standard deviation | percent Derived from MODIS geotiff tiles |
Percent tree cover standard deviation from MODIS data. Interpolated at latitude_bin0 and longitude_bin0. doi:10.5067/MODIS/MOD44B.006 | ../geolocation/delta_time ../geolocation/latitude_bin0 ../geolocation/longitude_bin0 | delta_time | -9999.0 |
| modis_nonvegetated | FLOAT64 (MT) |
MODIS non-vegetated | percent Derived from MODIS geotiff tiles |
Percent non-vegetated from MODIS data. Interpolated at latitude_bin0 and longitude_bin0. doi:10.5067/MODIS/MOD44B.006 | ../geolocation/delta_time ../geolocation/latitude_bin0 ../geolocation/longitude_bin0 | delta_time | -9999.0 |
| modis_nonvegetated_sd | FLOAT64 (MT) |
MODIS non-vegetated standard deviation | percent Derived from MODIS geotiff tiles |
Percent non-vegetated standard deviation from MODIS data. Interpolated at latitude_bin0 and longitude_bin0. doi:10.5067/MODIS/MOD44B.006 | ../geolocation/delta_time ../geolocation/latitude_bin0 ../geolocation/longitude_bin0 | delta_time | -9999.0 |