National Oceanic and Atmospheric Administration, United States Department of Commerce


  • Attention CLASS Users (07/11/14):
    CLASS will be off-line for maintenance on Monday, July 14, from 1230 to 1900 UTC. CLASS subscriptions will be paused and the web sites will be off-line. However, access to your completed orders will remain available on the CLASS ftp servers during maintenance. We apologize for the inconvenience and will try to minimize the downtime. If you have any questions please email CLASS Help Desk.

  • Attention All CLASS users (06/23/14):
    Recently, you may have heard about a new internet security weakness, known as Heartbleed, which is impacting some websites. There is no indication that Heartbleed has been used against www.class.noaa.gov or that any personal information has ever been at risk. However, we are asking users to change their current password out of an abundance of caution to ensure the protection of your information.

  • Attention CORS users (06/23/14):
    Starting January 1, 2014, the National Geodetic Survey's CORS data archived at CLASS now includes GPS+GLONASS data for stations with GNSS-capable equipment. The GLONASS broadcast navigation file (BRDC) is also available for users at the same starting date. (GLO navigation file name example: brdc1680.14g.gz)

    CORS data collections include RINEX since 1994 and raw GPS from selected CORS sites since 2004. The original at-sampling rate was retained except where there was only the 30-second decimated rate data. For more info see the CORS CLASS search page.

  • NOAA-16 retires after more than 13 years of service (06/12/14):
    NOAA-16 was decommissioned on June 9, 2014 at 14:23 UTC after it suddenly stopped sending data to Earth early on June 6. NOAA-16 had an exceptionally long run after it was launched in 2000 with a planned lifespan of 3 to 5 years. It was replaced by NOAA-18 in 2005 as the primary satellite. During its lifetime, NOAA-16 produced almost 400,000 orbital files totaling well over 13 TB of data.

  • Attention Suomi NPP Users:
    The most recent global NPP operational products are now available in daily tar files for quick and easy downloads at: ftp://ftp-npp.class.ngdc.noaa.gov/. Please see the NPP help page for instructions. Up to the most recent 85 days of data will be available for direct online access.

  • Suomi NPP data access status (12/16/13):
    Below is a list of S-NPP products released to the public and now available through CLASS. The complete list of products along with the begin dates of product availability are located on the Suomi NPP FAQ page. The remaining NPP products will be released to the user community over a time frame of several months. Please note that all newly released products are at 'Beta' maturity level as defined in the Product Maturity Level page. Details of high priority issues related to the data quality are contained in the Readme files provided by the NPP Project Scientist. Please read these before ordering and using the data!

  •   ATMS:

        Readme for released S-NPP ATMS SDR data (New Readme posted 12/2/13)

  •   CrIS:

        Readme for released S-NPP CrIS SDR data (New Readme posted 12/16/13)

  •   CrIMSS:

        Readme for released S-NPP CrIMSS EDR data (New Readme posted 02/13/14)

  •   OMPS:

        Readme for released S-NPP OMPS Nadir Ozone Profile data (New Readme posted 02/13/14)
        Readme for released S-NPP OMPS Ozone Total Column EDR and OMPS Nadir Total Column Ozone First Guess (New Readme posted 02/13/14)
        Readme for released S-NPP OMPS SDR data (New Readme posted 12/16/13)

  •   VIIRS:

        Readme for released S-NPP VIIRS Active Fires ARP data (New Readme posted 02/13/14)
        Readme for released S-NPP VIIRS Aerosol Optical Thickness (AOT) EDR data
        Readme for released S-NPP VIIRS Cloud Mask IP data (New Readme posted 12/16/13)
        Readme for released S-NPP VIIRS Cloud Products Status Report
        Readme for released S-NPP VIIRS Ice Concentration IP
        Readme for released S-NPP VIIRS Ice Surface Temperature EDR (New Readme posted 02/13/14)
        Readme for released S-NPP VIIRS Land Surface Temperature EDR
        Readme for released S-NPP VIIRS Near Constant Contrast (NCC) EDR Ground Track Mercator (GTM) Geolocation and VIIRS Near Constant Contrast Imagery EDR (New Readme posted 12/16/13)
        Readme for released S-NPP VIIRS Non-NCC Imagery EDR data (New Readme posted 12/16/13)
        Readme for released S-NPP VIIRS Ocean Color/Chlorophyll EDR
        Readme for released S-NPP VIIRS SDR data (New Readme posted 12/2/13)
        Readme for released S-NPP VIIRS Sea Ice Characterization EDR (New Readme posted 02/13/14)
        Readmefor released S-NPP VIIRS Sea Surface Temperature EDR
        Readme for released S-NPP VIIRS Snow Cover EDR Products (New Readme posted 02/13/14)
        Readme for released S-NPP VIIRS Surface Reflectance
        Readme for released S-NPP VIIRS Surface Type EDR
        Readme for released S-NPP VIIRS Suspended Matter EDR
        Readme for released

  •   Reminder:
        The most recent global NPP operational products are now available in daily tar files for quick and easy downloads at: ftp://ftp-npp.class.ngdc.noaa.gov/.

  • Tutorial for ordering Suomi NPP data in CLASS:
    A tutorial for ordering data through CLASS can be found at Data Access. The tutorial references Suomi NPP data but is applicable to all data types. If you have any questions please email CLASS Help Desk.