- Dataset Availability
- 2019-03-25T00:00:00Z–2024-11-29T00:00:00Z
- Dataset Provider
- USFS Laboratory for Applications of Remote Sensing in Ecology (LARSE) NASA GEDI mission, accessed through the USGS LP DAAC
- Tags
Description
GEDI's Level 2A Geolocated Elevation and Height Metrics Product (GEDI02_A) is primarily composed of 100 Relative Height (RH) metrics, which collectively describe the waveform collected by GEDI.
The original GEDI02_A product is a table of point with a spatial resolution (average footprint) of 25 meters.
Please see User Guide for more information.
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, attached to the International Space Station (ISS), collects data globally between 51.6° N and 51.6° S latitudes at the highest resolution and densest sampling of the 3-dimensional structure of the Earth. The GEDI instrument consists of three lasers producing a total of eight beam ground transects, which instantaneously sample eight ~25 m footprints spaced approximately every 60 m along-track.
| Product | Description |
|---|---|
| L2A Vector | LARSE/GEDI/GEDI02_A_002 |
| L2A Monthly raster | LARSE/GEDI/GEDI02_A_002_MONTHLY |
| L2A table index | LARSE/GEDI/GEDI02_A_002_INDEX |
| L2B Vector | LARSE/GEDI/GEDI02_B_002 |
| L2B Monthly raster | LARSE/GEDI/GEDI02_B_002_MONTHLY |
| L2B table index | LARSE/GEDI/GEDI02_B_002_INDEX |
| L4A Biomass Vector | LARSE/GEDI/GEDI04_A_002 |
| L4A Monthly raster | LARSE/GEDI/GEDI04_A_002_MONTHLY |
| L4A table index | LARSE/GEDI/GEDI04_A_002_INDEX |
| L4B Biomass | LARSE/GEDI/GEDI04_B_002 |
Table Schema
Table Schema
Beam identifier
Flag indicating degraded state of pointing and/or positioning information.
- 3X - ADF CHU solution unavailable (ST-2)
- 4X - Platform attitude
- 5X - Poor solution (filter covariance large)
- 6X - Data outage (platform attitude gap also)
- 7X - ST 1+2 unavailable (similar boresight FOV)
- 8X - ST 1+2+3 unavailable
- 9X - ST 1+2+3 and ISS unavailable
- X1 - Maneuver
- X2 - GPS data gap
- X3 - ST blinding
- X4 - Other
- X5 - GPS receiver clock drift
- X6 - Maneuver & GPS receiver clock drift
- X7 - GPS data gap & GPS receiver clock drift
- X8 - ST blinding & GPS receiver clock drift
- X9 - Other & GPS receiver clock drift
Time delta since Jan 1 00:00 2018
TanDEM-X elevation at GEDI footprint location
SRTM elevation at GEDI footprint location
Elevation of highest detected return relative to reference ellipsoid
Elevation of center of lowest mode relative to reference ellipsoid
Elevations potentially affected by 4bin (~60 cm) ranging error
Integrated counts in the return waveform relative to the mean noise level
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 UMD GLAD Landsat observations with classified surface water
Latitude of highest detected return
GEDI 1 km EASE 2.0 grid leaf-off start day-of-year
GEDI 1 km EASE 2.0 grid flag
Flag that indicates the vegetation growing cycle for leaf-on observations
GEDI 1 km EASE 2.0 grid leaf-on start day-of-year
Longitude of highest detected return
Percent non-vegetated from MODIS MOD44B V6 data
Percent non-vegetated standard deviation from MODIS MOD44B V6 data
Percent tree cover from MODIS MOD44B V6 data
Percent tree cover standard deviation from MODIS MOD44B V6 data
Number of detected modes in rxwaveform
GEDI 1 km EASE 2.0 grid Plant Functional Type (PFT)
Flag indicating likely invalid waveform (1=valid, 0=invalid)
GEDI 1 km EASE 2.0 grid world continental regions
Identifier of algorithm selected as identifying the lowest non-noise mode
Identifier of mode selected as lowest non-noise mode
Flag indicating status of selected_mode
Maxmimum canopy cover that can be penetrated. Valid range is [0, 1]. Values outside of this range may be present but must be ignored. They represent noise and non-land surface waveforms.
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.
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.
Indicates elev_lowestmode is within 300m of Digital Elevation Model (DEM) or Mean Sea Surface (MSS) elevation
The focal window size used to calculate urban_proportion. Values are 3 (3x3 pixel window size) or 5 (5x5 pixel window size).
The percentage proportion of land area within a focal area surrounding each shot that is urban land cover.
Orbit number
Minor frame number 0-241()
Shot number within beam
Azimuth in radians of the unit pointing vector for the laser in the local ENU frame. The angle is measured from North and positive towards East.
Elevation in radians of the unit pointing vector for the laser in the local ENU frame. The angle is measured from North and positive towards East.
Shot number, a unique identifier. This field has the format of OOOOOBBRRGNNNNNNNN, where:
- OOOOO: Orbit number
- BB: Beam number
- RR: Reserved for future use
- G: Sub-orbit granule number
- NNNNNNNN: Shot index
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Terms of Use
Terms of Use
This dataset is in the public domain and is available without restriction on use and distribution. See NASA's Earth Science Data & Information Policy for additional information.
Citations
-
GEDI L2A Elevation and Height Metrics Data Global Footprint Level - GEDI02_A Dubayah, R., M. Hofton, J. Blair, J. Armston, H. Tang, S. Luthcke. GEDI L2A Elevation and Height Metrics Data Global Footprint Level V002. 2021, distributed by NASA EOSDIS Land Processes DAAC. Accessed YYYY-MM-DD.
DOIs
Explore with Earth Engine
Code Editor (JavaScript)
var dataset = ee . FeatureCollection ( 'LARSE/GEDI/GEDI02_A_002/GEDI02_A_2021244154857_O15413_04_T05622_02_003_02_V002' ); dataset = dataset . style ({ color : 'black' , pointSize : 1 }); Map . setCenter ( - 64.88 , - 31.77 , 15 ); Map . addLayer ( dataset );
