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Your location: Home / GHRSST PP Global Framework components / GHRSST PP Long Term Stewardship and Re analysis facility (LTSRF)

The GHRSST-PP Long Term Stewardship and Re-analysis facility ( LTSRF )

At the base of the R/GTS framework is the Long Term Stewardship and Reanalysis Facility (see http://ghrsst.nodc.noaa.gov) located at the NOAA National Oceanographic Data Center. This delivers individual as well as multi-sensor blended GHRSST-PP SST archive products rapidly and routinely. The LTSRF provides both the GHRSST-PP long term archive and forms the central hub of the distributed GHRSST-PP re-analysis (RAN) system. As the name LTSRF implies, complete stewardship rather than a simple archive in the traditional sense, is required to enable a successful RAN system which protects the significant investment made by RDAC and GDAC teams that have generated GHRSST-PP data products. Six broad activities define the overall stewardship responsibilities of the LTSRF :

1. Data ingest including the receipt, verification, and proper cataloguing, via appropriate file-level and collection-level metadata, of the input data streams, defined above as for delayed-mode data.
2. Archive activities including offsite backup, media migration, and validation of stored data.
3. Data access including the critical role of providing data and metadata to both a diverse user community and to the LTSRF itself, following relevant standards. All data are provided in a free and open manner via the internet. Fees for media distribution (CD, DVD, etc.) would be limited to cost of production only.
4. Application utilities and support to help data providers/developers use and test GHRSST-PP data in a variety of applications. As data providers/developers become much more knowledgeable about the data they are able to quickly identify weakness and rapidly validate the use of GHRSST-PP data in new application areas and provide feedback on the data quality. The latter is essential for proper long-term stewardship of GHRSST-PP data.
5. The User Services component of the LTSRF not only provides the standard user assistance with questions about the data, but also serves as the vital feedback loop to receive user input on problems, new applications, and directions for future improvements. This component will be primarily achieved through user services support of the GDAC at the PO.DAAC.
6. Reanalysis functionality enabling reprocessing of the entire GHRSST-PP collection at a sufficiently rapid pace to take advantage of new delayed mode data sets or new analysis techniques.

In practice, thirty days after an observation has been made, GHRSST data are transferred from the GDAC to the LTSRF where stewardship is provided in perpetuity. A large metadata transformation process, which begins at the GDAC to create Federal Geographic Data Committee compliant records for every daily collection of GHRSST products, is also completed at the LTSRF. GHRSST-PP is moving towards full compliance with ISO 19115 geo-spatial metadata standards.

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(Last Updated: 16-02-2007)