National Oceanic and Atmospheric Administration, United States Department of Commerce


  • New tutorial on how to search and order data in CLASS! (04/27/15):
    A tutorial for searching and ordering data through CLASS can be found here: CLASS Data Access Tutorial. The tutorial gives a step by step screen capture views of the searching and ordering process from registering with CLASS to checking on the status of your order. It also covers the various levels of access services offered from CLASS at this time. If you have any questions please email the CLASS Help Desk.

  • 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.

  • 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 (11/25/14):
    The majority of S-NPP products are now available and can be ordered through CLASS. The ones available to the public will show the begin dates after the product name on the search page. Also, a "quick look" of which products are at which maturity stages can be easily viewed at the STAR Algorithm Product Maturity Matrix website. Details of high priority issues related to the data quality are contained in the Readme files provided by the S-NPP Project Scientist. Many of these have recently been updated. Please read these before ordering and using the data.

  •   ATMS:

        Readme for released S-NPP ATMS SDR data (1/6/15)

  •   CrIS:

        Readme for released S-NPP CrIS SDR data (1/6/15)

  •   CrIMSS:

        Readme for released S-NPP CrIMSS EDR data (Posted 2/13/14)

  •   OMPS:

        Readme for released S-NPP OMPS Nadir Ozone Profile data (Posted 2/13/14)
        Readme for released S-NPP OMPS Ozone Total Column EDR and OMPS Nadir Total Column Ozone First Guess (Posted 8/20/14)
        Readme for released S-NPP OMPS SDR data (Posted 12/16/13)

  •   VIIRS:

        Readme for released S-NPP VIIRS Active Fires ARP data (2/13/14)
        Readme for released S-NPP VIIRS Aerosol Optical Thickness (AOT) EDR data
        Readme for released S-NPP VIIRS Cloud Mask IP data (1/6/15)
        Readme for released S-NPP VIIRS Cloud Products Status Report (1/6/15)
        Readme for released S-NPP VIIRS Ice Concentration IP
        Readme for released S-NPP VIIRS Ice Surface Temperature EDR (2/13/14)
        Readme for released S-NPP VIIRS Land Surface Temperature EDR (1/6/15)
        Readme for released S-NPP VIIRS Near Constant Contrast (NCC) EDR Ground Track Mercator (GTM) Geolocation and VIIRS Near Constant Contrast Imagery EDR (1/6/15)
        Readme for released S-NPP VIIRS Non-NCC Imagery EDR data (1/6/15)
        Readme for released S-NPP VIIRS Ocean Color/Chlorophyll EDR
        Readme for released S-NPP VIIRS SDR data (1/6/15)
        Readme for released S-NPP VIIRS Sea Ice Characterization EDR (2/13/14)
        Readme for released S-NPP VIIRS Sea Surface Temperature EDR (1/6/15)
        Readme for released S-NPP VIIRS Snow Cover EDR Products (2/13/14)
        Readme for released S-NPP VIIRS Surface Reflectance (1/6/15)
        Readme for released S-NPP VIIRS Surface Type EDR
        Readme for released S-NPP VIIRS Suspended Matter EDR
        Readme for released S-NPP VIIRS Veg Index EDR