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    • NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Optical Depth (COD)

    Metadata Updated: November 2, 2023

    The GOES-R Advanced Baseline Imager (ABI) Cloud Optical Depth product contains an image with pixel values identifying the measure of the extinction due to condensed water or ice clouds at a wavelength of 0.64 um. Separate algorithms are used for daytime, solar zenith angle to 82 degrees, and nighttime, solar zenith angle greater than 82 degrees, conditions. The product is generated in combination with the Cloud Particle Size product by the same algorithms. The product includes data quality information that identifies whether the daytime or nighttime algorithm generated the pixel, and provides an assessment of the cloud optical depth data values for on-earth pixels. The cloud optical depth value is a dimensionless quantity. The Cloud Optical Depth product image is produced on the ABI fixed grid at 4 km resolution for Full Disk and 2 km resolution for CONUS coverage regions. The product's spatial resolution increased from 4 km to 2 km on 22 March 2023. Product data is produced under the following conditions for the daytime algorithm: Cloudy; Geolocated source data to local zenith angles of 65 degrees and to solar zenith angles of 82 degrees. Product data generated by the nighttime algorithm is produced under the following conditions: Cloudy; Geolocated source data to local zenith angles of 70 degrees and solar zenith angles between 82 and 180 degrees. The cloud optical depth values reported range from 0 to 160. The sensitivity of the product to high optical depths is limited for nighttime conditions to the nighttime maximum threshold, which is an optical depth value of 16. Cloud Optical Depth product data is identified as degraded in the terminator region, which is a solar zenith angle between 65 and 82 degrees for the daytime algorithm, and 82 and 90 degrees for the nighttime algorithm.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date September 18, 2023
    Metadata Created Date November 2, 2023
    Metadata Updated Date November 2, 2023
    Reference Date(s) February 22, 2018 (publication)
    Frequency Of Update continual

    Metadata Source

    Harvested from ncdc

    Other Data Resources

    Graphic Preview

    Example of the Cloud Optical Depth product as generated by the GOES-R Cloud Optical and Microphysical Properties algorithm.

    Additional Metadata

    Resource Type Dataset
    Metadata Date September 18, 2023
    Metadata Created Date November 2, 2023
    Metadata Updated Date November 2, 2023
    Reference Date(s) February 22, 2018 (publication)
    Responsible Party DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
    Contact Email
    Guid gov.noaa.ncdc:C01508
    Access Constraints Cite as: GOES-R Algorithm Working Group and GOES-R Program Office, (2018): NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Optical Depth (COD). [indicate subset used]. NOAA National Centers for Environmental Information. doi:10.7289/V58G8J02. [access date]., Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
    Bbox East Long 6.2995
    Bbox North Lat 81.328
    Bbox South Lat -81.32
    Bbox West Long -156.2
    Coupled Resource
    Frequency Of Update continual
    Graphic Preview Description Example of the Cloud Optical Depth product as generated by the GOES-R Cloud Optical and Microphysical Properties algorithm.
    Graphic Preview File https://www.ncei.noaa.gov/pub/data/metadata/images/C01508.jpg
    Graphic Preview Type JPEG
    Harvest Object Id e1919c7d-5d79-4653-9ada-6064d3d43cbd
    Harvest Source Id 2cb3ef77-1683-4c2a-9119-dc65e50917c6
    Harvest Source Title ncdc
    Licence For a complete description of use limitations for this baseline product, see the Algorithm Theoretical Basis Document (ATBD).
    Lineage These data were produced by the NOAA Office of Satellite and Product Operations (OSPO) and are archived at the NOAA National Centers for Environmental Information (NCEI).
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-156.2, -81.32], [6.2995, -81.32], [6.2995, 81.328], [-156.2, 81.328], [-156.2, -81.32]]]}
    Progress onGoing
    Spatial Data Service Type
    Spatial Reference System urn:ogc:def:crs:EPSG::4326
    Spatial Harvester True
    Temporal Extent Begin 2017-06-08

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