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    • Indicators of Coastal Water Quality: Annual Chlorophyll-a Concentration 1998-2007

    Metadata Updated: August 23, 2025

    The Annual Chlorophyll-a Concentrations component of the Indicators of Coastal Water Quality Collection consists of gridded satellite measurements of chlorophyll-a concentrations (in nanogram/cubic meter) in a band extending between 10 and 100 km from the shoreline. Chlorophyll-a concentrations are derived from NASA's Sea-viewing Wide Field-of-view Sensor (SeaWiFS). The grids are based on annual composites of SeaWiFS satellite data provided by the SeaWiFS Project, NASA/Goddard Space Flight Center and GeoEye in the form of HDF files at a resolution of 5 arc-minutes (approximately 9 x 9 km at the equator). The source files are true-color images generated from sub-sampled, calibrated, Rayleigh-corrected level-2 data, which are derived from raw radiance counts by applying sensor calibration, atmospheric corrections, and bio-optical algorithms. To arrive at chlorophyll-a concentrations, radiance counts were converted using the conversion formula provided as part of the original data files. The gridding is done by the Columbia University Center for International Earth Science Information Network (CIESIN).

    Access & Use Information

    Public: This dataset is intended for public access and use. 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

    References

    https://doi.org/10.7927/H48W3B88
    https://doi.org/10.7927/H4J96490

    Dates

    Metadata Created Date November 12, 2020
    Metadata Updated Date August 23, 2025

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 12, 2020
    Metadata Updated Date August 23, 2025
    Publisher SEDAC
    Maintainer
    Identifier C179002069-SEDAC
    Data First Published 2009-12-31
    Language en-US
    Data Last Modified 2025-07-17
    Category ICWQ, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id d47d083d-b43d-4637-a072-1fda21ecee91
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Metadata Type geospatial
    Old Spatial -180.0 -90.0 179.99856 89.99928
    Program Code 026:001
    Related Documents https://doi.org/10.7927/H48W3B88, https://doi.org/10.7927/H4J96490
    Source Datajson Identifier True
    Source Hash 98d027d062e5cbe6188523c9ec2927cbdfb11961b5fd49e95d17d0cef9a27558
    Source Schema Version 1.1
    Spatial
    Temporal 1998-01-01T00:00:00Z/2007-12-31T00:00:00Z

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