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OCO-2 Level 1B calibrated, geolocated calibration spectra, Retrospective Processing V10r (OCO2_L1B_Calibration) at GES DISC

Published by NASA/GSFC/SED/ESD/GCDC/GESDISC | National Aeronautics and Space Administration | Metadata Last Checked: January 10, 2026 | Last Modified: 2025-04-01
Version 10r is the current version of the data set. Older versions will no longer be available and are superseded by Version 10r. Version 8r is the current version of the data set. Version 7r has been superseded by Version 8r. The Orbiting Carbon Observatory is the first NASA missiondesigned to collect space-based measurements of atmospheric carbon dioxidewith the precision, resolution, and coverage needed to characterize theprocesses 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 ofreflected sunlight in the near-infrared CO2 near 1.61 and 2.06 micrometers and inmolecular oxygen (O2) A-Band at 0.76 micrometers. The three spectrometers have different characteristics and are calibrated independently. Their raw data numbers (DN) are delivered correlated in time tothe Level 1B process as Level 1A products. Each band has 1016 spectralelements, although some are masked out in the L2 retrieval.This L1B product results from calibration mode measurements (e.g., Lunar,Solar, Dark observations), and thus it differs from the OCO2_L1B_Science(L1bSc) product. The differences in the product formats are only in the geolocation information provided. Whereas the L1bSc products report geolocation data for each sounding, calibration products report the directionof the boresight vector.This is the retrospective processing where the calibration data is estimated from the full timeseries of data (before, during, and after the measurements), and is expected to be of slightly higher quality.

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Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
                                            [
  "026:00"
]
contactPoint 
                                            {
  "fn": "JENNIFER WEI, PH. D",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:jennifer.c.wei@nasa.gov"
}
description Version 10r is the current version of the data set. Older versions will no longer be available and are superseded by Version 10r. Version 8r is the current version of the data set. Version 7r has been superseded by Version 8r. The Orbiting Carbon Observatory is the first NASA missiondesigned to collect space-based measurements of atmospheric carbon dioxidewith the precision, resolution, and coverage needed to characterize theprocesses 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 ofreflected sunlight in the near-infrared CO2 near 1.61 and 2.06 micrometers and inmolecular oxygen (O2) A-Band at 0.76 micrometers. The three spectrometers have different characteristics and are calibrated independently. Their raw data numbers (DN) are delivered correlated in time tothe Level 1B process as Level 1A products. Each band has 1016 spectralelements, although some are masked out in the L2 retrieval.This L1B product results from calibration mode measurements (e.g., Lunar,Solar, Dark observations), and thus it differs from the OCO2_L1B_Science(L1bSc) product. The differences in the product formats are only in the geolocation information provided. Whereas the L1bSc products report geolocation data for each sounding, calibration products report the directionof the boresight vector.This is the retrospective processing where the calibration data is estimated from the full timeseries of data (before, during, and after the measurements), and is expected to be of slightly higher quality.
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    "description": "Level  1B Algorithm Theoretical Basis (ATBD)",
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Jet Propulsion Laboratory, California Institute of Technology.
Copyright 2016 California Institute of Technology.
U.S. Government sponsorship acknowledged.",
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    "@type": "dcat:Distribution",
    "title": "Download this dataset through Earthdata Search",
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identifier C1685783883-GES_DISC
issued 2019-06-27
keyword 
                                            [
  "atmosphere",
  "atmospheric-chemistry",
  "earth-science",
  "infrared-wavelengths",
  "spectral-engineering"
]
landingPage https://cmr.earthdata.nasa.gov:443/search/concepts/C1685783883-GES_DISC.html
language 
                                            [
  "en-US"
]
modified 2025-04-01
programCode 
                                            [
  "026:001"
]
publisher 
                                            {
  "name": "NASA/GSFC/SED/ESD/GCDC/GESDISC",
  "@type": "org:Organization"
}
spatial -180.0 -90.0 180.0 90.0
temporal 2014-09-06T00:00:00Z/2022-01-17T00:00:00Z
theme 
                                            [
  "OCO-2",
  "geospatial"
]
title OCO-2 Level 1B calibrated, geolocated calibration spectra, Retrospective Processing V10r (OCO2_L1B_Calibration) at GES DISC

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