OCO-3 Level 1A collated, parsed, science or calibration data, Retrospective Processing V11r (OCO3_L1aIn_Pixel) at GES DISC

Version 11r is the current version of the data set. Older versions will no longer be available and are superseded by Version 11r.

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-3 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. The three spectrometers have different characteristics and are calibrated independently. Their raw data numbers (DN) are delivered correlated in time to the Level 1B process as Level 1A products. Each band has 1016 spectral elements, although some are masked out in the L2 retrieval.This product is the input to the Level 1B process. It is depacketized raw data formatted into a standard granularity with calibrated engineering data (for both science and calibration observations), in the Sample Mode of operation.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.

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated June 23, 2026, 02:56 (UTC)
Created March 10, 2026, 03:06 (UTC)
accessLevel public
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harvest_source_title Science Discovery Engine
identifier /SDE/CMR_API/|C3268215274-GES_DISC
license https://www.usa.gov/government-works
modified 2026-06-15T22:16:02Z
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publisher NASA/GSFC/SED/ESD/TISL/GESDISC
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temporal 2014-07-03/2026-06-15
theme {"Earth Science"}