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Description
Version 11r is the current version of the data set. Older versions will no longer be available and are superseded by Version 11r.
The OCO-2 SIF Lite files contain bias-corrected solar induced chlorophyll fluorescence along with other select fields aggregated as daily files.
The Orbiting Carbon Observatory is the first NASA mission designed to collect space-based measurements of atmospheric carbon dioxide with the precision, resolution, and coverage needed to characterize the processes controlling its buildup in the atmosphere. The OCO-2 project uses the LEOStar-2 spacecraft that carries a single instrument. It incorporates three high-resolution spectrometers that make coincident measurements of reflected sunlight in the near-infrared CO2 near 1.61 and 2.06 micrometers and in molecular oxygen (O2) A-Band at 0.76 micrometers.
This collection encompass the output from the IMAP-DOAS preprocessor, which is used for both screening of the official XCO2 product as well as for the retrieval of Solar-Induced Fluorescence from the 0.76 micrometer O2 A-band. The IMAP-DOAS preprocessor, just as the ABO2 cloud screen, is implemented in the operational OCO-2 processing pipeline.
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C2248652649-GES_DISC
Data State
COMPLETE
Number of Files/Granules
3274
Processing Level
2
Published
Updated
Science Keywords
Atmospheric Carbon Dioxide
,
Solar Induced Fluorescence
Citation
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Citation Copied
Science Computing Facility, J. P. L. (2017). OCO-2 Level 2 bias-corrected solar-induced fluorescence and other select fields from the IMAP-DOAS algorithm aggregated as daily files, Retrospective processing V11r [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/OTRE7KQS8AU8 Date Accessed: 2026-05-02
Science Computing Facility, Jet Propulsion Laboratory. “OCO-2 Level 2 Bias-Corrected Solar-Induced Fluorescence and Other Select Fields from the IMAP-DOAS Algorithm Aggregated as Daily Files, Retrospective Processing V11r.” NASA Goddard Earth Sciences Data and Information Services Center, 2017. doi:10.5067/OTRE7KQS8AU8. Date Accessed: 2026-05-02
Science Computing Facility, Jet Propulsion Laboratory. OCO-2 Level 2 Bias-Corrected Solar-Induced Fluorescence and Other Select Fields from the IMAP-DOAS Algorithm Aggregated as Daily Files, Retrospective Processing V11r. NASA Goddard Earth Sciences Data and Information Services Center, 2017, doi:10.5067/OTRE7KQS8AU8. Date Accessed: 2026-05-02
Atmospheric Carbon Dioxide, Solar Induced Fluorescence, Leaf Area Index (LAI), Fraction Of Absorbed Photosynthetically Active Radiation (fapar), Vegetation Index, Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI)
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.
Indicator of whether the sounding contained clouds: 0 - "Classified clear", 1 - "Classified cloudy", 2 - "Not classified", all other values undefined; not used in SIF Lite processing
N/A
int16
N/A
0 to 2
1
0
Cloud/co2_ratio
Ratio of CO2 retrieved in weak and strong CO2 band (value near 1 indicate scattering free scene)
N/A
float32
N/A
0 to 10
1
0
Cloud/delta_pressure_abp
Retrieved-predicted surface pressure from ABO2, usable as cloud screener; not used in SIF Lite processing
Pa
float32
N/A
-100000 to 100000
1
0
Cloud/o2_ratio
Ratio of retrieved and predicted O2 column
N/A
float32
N/A
0 to 10
1
0
Cloud/surface_albedo_abp
Surface albedo (lambertian equivalent) as retrieved in the ABO2 preprocessor at 760nm; not used in SIF processing
N/A
float32
N/A
0 to 10
1
0
Daily_SIF_740nm
Daily Corrected Solar induced chlorophyll fluorescence at 740 nm: Daily_SIF_740nm = SIF_740 * /Science/daily_correction_factor
W/m^2/sr/µm
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Daily_SIF_757nm
Daily Corrected Solar induced chlorophyll fluorescence at 757 nm: Daily_SIF_757nm = /Science/sif_757nm * /Science/daily_correction_factor
W/m^2/sr/µm
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Daily_SIF_771nm
Daily Corrected Solar induced chlorophyll fluorescence at 771 nm: Daily_SIF_771nm = /Science/sif_771nm * /Science/daily_correction_factor
W/m^2/sr/µm
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Delta_Time
Timestamp (seconds since 1 January 1990)
N/A
float64
N/A
0 to 1.0E+30
1
0
Geolocation/altitude
Surface altitude of observed footprint
m
float32
N/A
-1000 to 10000
1
0
Geolocation/footprint_latitude_vertices
Latitude corner coordinates of the sounding location
degrees_north
float32
N/A
-90 to 90
1
0
Geolocation/footprint_longitude_vertices
Longitude corner coordinates of the sounding location
degrees_east
float32
N/A
-180 to 180
1
0
Geolocation/latitude
Center latitude of the measurement
degrees_north
float32
N/A
-90 to 90
1
0
Geolocation/longitude
Center longitude of the measurement
N/A
float32
N/A
-180 to 180
1
0
Geolocation/sensor_azimuth_angle
Azimuth angle between line of sight and local north
degrees
float32
N/A
0 to 360
1
0
Geolocation/sensor_zenith_angle
Sensor zenith angle is the angle between the line of sight to the sensor and the local vertical
degrees
float32
N/A
0 to 90
1
0
Geolocation/solar_azimuth_angle
Azimuth angle between the solar direction as defined by the sounding location, and the soudning local north
degrees
float32
N/A
0 to 360
1
0
Geolocation/solar_zenith_angle
Solar zenith angle is the angle between the line of sight to the sun and the local vertical
degrees
float32
N/A
0 to 90
1
0
Geolocation/time_tai93
Timestamp (seconds since 1 January 1993)
seconds since 1993-01-01 00:00:00 UTC
float64
N/A
0 to 1.0E+30
1
0
Latitude
Center latitude of the measurement
degrees_north
float32
N/A
-90 to 90
1
0
Latitude_Corners
Corner latitude of the measurement
degrees_north
float32
N/A
-90 to 90
1
0
Longitude
Center longitude of the measurement
degrees_east
float32
N/A
-180 to 180
1
0
Longitude_Corners
Corner longitude of the measurement
degrees_east
float32
N/A
-180 to 180
1
0
Metadata/BuildId
The ID of the Build, including the software version that created this product
N/A
string
N/A
N/A
N/A
N/A
Metadata/CollectionLabel
The Collection Label of the Build, including the software version that created this product
N/A
string
N/A
N/A
N/A
N/A
Metadata/FootprintId
OCO-2 footprint identifier (1-8), identifying the 8 independent OCO-2 spatial samples per frame
N/A
int16
N/A
1 to 8
1
0
Metadata/MeasurementMode
Instrument Measurement Mode, 0=Nadir, 1=Glint, 2=Target, 3=AreaMap, 4=Transition; users might consider to separate these for analysis
N/A
int16
N/A
0 to 4
1
0
Metadata/OrbitId
Orbit Identifier: Start Orbit Number (OCO-2) or Start Solar Day (OCO-3) of observation
N/A
int32
N/A
0 to 99999
1
0
Metadata/SoundingId
Unique Identifier for each sounding
YYYYMMDDHHMMSS
int64
N/A
0 to 10000000000000000
1
0
Meteo/specific_humidity
Specific humidity at surface layer at the sounding location, interpolated from GEOS-5 FP-IT inst3_3d_asm_Nv field QV (specific_humidity)
kg/kg
float32
N/A
0 to 10000
1
0
Meteo/surface_pressure
Surface pressure at the sounding location; interpolated from GEOS-5 FP-IT inst3_3d_asm_Nv field PS (surface_pressure)
Pa
float32
N/A
0 to 999999
1
0
Meteo/temperature_skin
Skin temperature at the sounding location; interpolated from GEOS-5 FP-IT inst3_2d_asm_Nx field TS (surface_skin_temperature)
K
float32
N/A
0 to 1000
1
0
Meteo/temperature_two_meter
Two-meter temperature at the sounding location; interpolated from GEOS-5 FP-IT inst3_2d_asm_Nx field T2M (2-meter_air_temperature)
K
float32
N/A
0 to 1000
1
0
Meteo/vapor_pressure_deficit
Vapor pressure deficit at the sounding location (2m)
Pa
float32
N/A
-999999 to 999999
1
0
Meteo/wind_speed
Surface wind speed at sounding location; interpolated from GEOS-5 FP-IT inst3_2d_asm_Nx field U10M and inst3_2d_asm_Nx field V10M (10-meter_eastward_wind, 10-meter_northward_wind)
m/s
float32
N/A
0 to 1000
1
0
Offset/SIF_Mean_757nm
Mean Solar Induced Fluorescence at 757nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Offset/SIF_Mean_771nm
Mean Solar Induced Fluorescence at 771nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Offset/SIF_Median_757nm
Median Solar Induced Fluorescence at 757nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Offset/SIF_Median_771nm
Median Solar Induced Fluorescence at 771nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Offset/SIF_Relative_Mean_757nm
Mean relative Solar Induced Fluorescence at 757nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Offset/SIF_Relative_Mean_771nm
Mean relative Solar Induced Fluorescence at 771nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Offset/SIF_Relative_Median_757nm
Median relative Solar Induced Fluorescence at 757nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Offset/SIF_Relative_Median_771nm
Median relative Solar Induced Fluorescence at 771nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
-1.0000000150475E+30 to 1.0000000150475E+30
1
0
Offset/SIF_Relative_SDev_757nm
Standard deviation of relative Solar Induced Fluorescence at 757nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
0 to 1.0000000150475E+30
1
0
Offset/SIF_Relative_SDev_771nm
Standard deviation of relative Solar Induced Fluorescence at 771nm (by footprint, for adjusted and unadjusted values)
N/A
float32
N/A
0 to 1.0000000150475E+30
1
0
Offset/signal_histogram_757nm
Signal level histogram for 757 nm radiances
N/A
int32
N/A
0 to 999999999
1
0
Offset/signal_histogram_771nm
Signal level histogram for 771 nm radiances
N/A
int32
N/A
0 to 999999999
1
0
Offset/signal_histogram_bins
Radiance level offset histogram bins
W/m^2/sr/µm
float32
N/A
0 to 1.0000000150475E+30
1
0
Quality_Flag
SIF Lite Quality Flag: 0 = best (passes quality control + cloud fraction = 0.0); 1 = good (passes quality control); 2 = bad (failed quality control); -1 = not investigated
N/A
int16
N/A
-1 to 2
1
0
SAz
Azimuth angle between the solar direction as defined by the sounding location, and the sounding local north