NOAA's Comprehensive Large Array-data Stewardship System

Important Update: Changes to CLASS URLs (03/28/2024):

The new CLASS website and dissemination URLs are now active and the legacy URLs are no longer valid, except the old CLASS website URL will redirect users to the new URL for some time. See changes below.

Defunct ftp links	New ftp links
ftp://ftp-jpss.avl.class.noaa.gov/	ftp://ftp-data.class.noaa.gov/JPSS/ (JPSS TAR files) (Case sensitive)
ftp://ftp.avl.class.noaa.gov	ftp://ftp-order.class.noaa.gov/ (ad hoc orders)
ftp://ftp.avl.class.noaa.gov/sub	ftp://ftp-order.class.noaa.gov/sub/ (subscriptions)

The new ftp login user id changed from "anonymous" to "ftp" followed by any set of password characters defined by the user. These changes are in accordance with the transfer rules established within the AWS Transfer Family.

Defunct https links	New https links
https://download.avl.class.noaa.gov/download/jpss/	https://data.class.noaa.gov/JPSS/ (JPSS TAR files) (Case sensitive)
https://download.avl.class.noaa.gov/download/	https://order.class.noaa.gov/public/ (ad hoc orders)
https://download.avl.class.noaa.gov/download/sub	https://order.class.noaa.gov/public/sub/ (subscriptions)

Old CLASS website URL	New CLASS website URL
https://www.avl.class.noaa.gov	https://www.aev.class.noaa.gov

Note: www.class.noaa.gov will continue to work

If you have any questions or need assistance please submit an email to CLASS Help Desk.

Attention JPSS Users! (01/24/2024):
- Starting in July 2024, for all JPSS satellites (S-NPP, NOAA-20, and NOAA-21), the VIIRS SDR data will be associated with and delivered with the VIIRS Terrain-Corrected Geolocation instead of the VIIRS Ellipsoid Geolocation.
- Historical VIIRS SDRs will continue to be associated with and delivered with the Ellipsoid Geolocation.
- However, only for S-NPP, the VIIRS Ellipsoid Geolocation (GMODO) will remain orderable separately, just not associated with and delivered with theS-NPP VIIRS SDR data. GMODO will not be available from NOAA-20 or NOAA-21.
- The VIIRS Day-Night Band SDR will continue to be associated with and delivered with the VIIRS Day-Night Band Geolocation.
- VIIRS IPs and EDRs will not be affected by the VIIRS SDR geolocation change.
Attention JPSS Data Users! (updated on 10/19/2023):
Now available! The reprocessed Sensor Data Records (SDR) for all instruments flown on S-NPP and reprocessed Temperature Data Records (TDR) for the ATMS instrument flown on S-NPP is now accessible via the CLASS web ordering system. The reprocessed data is located under their own data families listed on the drop down product menu. The date range which covers the reprocessing period for each instrument is:
- ATMS SDR/TDR (2011-11-08 - 2019-10-15) - The complete record is available under RPATMSSDR and RPATMSTDR
- CrIS SDR (2012-02-20 - 2020-01-29) - The complete record is available under RPCRISSDR
- OMPS SDR (2012-01-30 - 2020-05-30) - The complete record is available under RPOMPSSDR
- VIIRS SDR (2012-01-02 - 2020-04-30) - The complete record is available under RPVIIRSSDR
The operational data received after the reprocessed date ranges uses the latest version of the reprocessing algorithm.
Attention JPSS Users. Start dates and times of NOAA-21 products now available to the public. (4/20/2023):
- ATMS Sensor Data Record: Dec 3, 2022 @23:49:55 UTC
- ATMS Temperature Data Record: Dec 3, 2022 @23:49:55 UTC
- CrIS Sensor Data Record Mar 23, 2023 @19:09:30 UTC
- VIIRS Sensor Data Record Mar 30, 2023 @00:10 UTC
- VIIRS Imagery Environmental Data Record: Mar 30, 2023 @00:10 UTC
For easy access to the most recent JPSS global daily tar files please go to ftp://ftp-data.class.noaa.gov/JPSS/ or https://data.class.noaa.gov/JPSS/.

Also, be sure to review the maturity Readmes for any data issues and caveats on the STAR JPSS Algorithm Maturity Matrix website at https://www.star.nesdis.noaa.gov/jpss/AlgorithmMaturity.php.
Attention New CLASS Users! See tutorial on accessing data from CLASS (4/12/2018):
Please click on the following link to get step by step instructions on how to use CLASS to search and order data: https://www.aev.class.noaa.gov/notification/pdfs/CLASS%20Data%20Access%20Tutorial_042015.pdf..

If you have any questions or need assistance please submit an email to CLASS Help Desk.