Global Data Analysis Centres (GDAC)
The GDAC lies at the core of the R/GTS providing a data management entity and "clearinghouse" for near real time data ingestion and distribution, metadata management and data search/discovery. GDAC provide the hubs of the GHRSST-PP R/GTS framework linking together Regional Data Assembly Centres (RDAC) services and user communities.
GDAC responsibilities include:
- The ingestion, quality checking and management of the near real-time L2P and L4 products and metadata from RDAC data providers.
- Insertion of model-based meteorological and sea ice ancillary fields into GHRSST-PP L2P products, if not already present.
- Distribution of all GHRSST products through traditional protocols (i.e., FTP, OPeNDAP) and unique user subscriptions from a 30-day rolling store.
- Delivery of 30 day and older GHRSST products and Federal Geographic Data Committee (FGDC) compliant metadata to the LTSRF for product archiving and reanalysis.
- Metadata management and data search services (MMR, see http://ghrsst.jpl.nasa.gov/data_search.html) and data tools (e.g., sub-setting).
- Customer and Application support for current and future users.
- Integration of user services at the GDAC with the Application and User Services office of the GHRSST-PP International Project Office and the GDAC where customers can submit support requests via a web site monitored by customer service specialists and data engineers. Applications development is currently focused on integrating GHRSST products into coastal decision support systems and marine resource management (e.g., U.S. Integrated Ocean Observing System, IOOS). Measures of effectiveness are tracked and reported at the GDAC to provide overall metrics for the GHRSST-PP program.
USA GDAC
A Global Data Assembly Center (GDAC) maintained at the Physical Oceanography Distributed Active Archive Center (PO.DAAC) is tasked with the Distribution and User Support of all GHRSST-PP data products. GHRSST level 2 preprocessed data ( L2P ) is now available via the FTP in near real time through the ftp site at: ftp://podaac.jpl.nasa.gov/pub/GHRSST or by direct ftp at podaac.jpl.nasa.gov. Read software for the netCDF files are available under: http://podaac.jpl.nasa.gov/pub/GHRSST/software and documentation under: http://podaac.jpl.nasa.gov/pub/GHRSST/doc. Information on the GDAC may be obtained through http://ghrsst.jpl.nasa.gov
GHRSST data now available through the GDAC includes:
- Medspiration Regional Data Assembly Center ( RDAC ) L2P products for TMI, AMSRE, AVHRR, AATSR, SEVIRI are currently available for the Atlantic and parts of the Pacific Central American Coast.
- Medspiration Level 4 ultra-high resolution optimally interpolated SSTs in the Mediterranean.
- High Resolution Diagnostic Data Sets
- Remote Sensing Systems ( RDAC ) L2P products are available globally for AMSRE and TMI.
- Master Metadata Repository (MMR) search capabilities
- A web site has been fully implemented in support of all the GDAC actitivities
- OCEANIDS, the near real time management software at the GDAC, has been managing all the data streams going into the GDAC. This includes data status and inventory checks for all GHRSST-PP data streams. Status of GHRSST data streams coming into OCEANIDS may be accessed through: http://ghrsst.jpl.nasa.gov/cgi-bin/oceanids.cgi
A European GDAC
Within the framework of the European Commission Global Monitoring for Environment and Security (GMES, see http://www.gmes.info/), a Marine Core Service (MCS) providing essential 'core' data products will streamline European capacities for forecasting, monitoring and reporting on the ocean state. In addition, through intermediate and end user interactions, MCS will foster Ocean services and applications on specific environmental and safety issues, for both the global ocean and the regional European seas.The Marine Core Services (MCS) will address the requirements from national and European policies, international conventions, as well as European and international agencies (e.g. EEA, ICES, WCRP, UNFCCC), for data, information products and indicators on the environment at local to global scales. The MCS will contribute directly to:
- Better exploit and manage ocean resources (e.g. offshore oil and gas industry, fisheries);
- Improve safety and efficiency of maritime transport, shipping, and naval operations;
- Anticipate and mitigate the effects of environmental hazards and pollution crisis (e.g. oil spills, harmful algal blooms);
- Marine research (e.g. better understanding of the oceans and their ecosystems, of ocean climate variability);
- Seasonal climate prediction;
- Implement specific services for coastal management and planning (e.g. coastal flooding and erosion).
In terms of GHRSST-PP, the MCS will include a GDAC functionality for SST building on European contributions to the GHRSST-PP R/GTS (e.g., ESA Medspiration, Met Office OSTIA, MERSEA, EUMETSAT OSI-SAF) including the following elements:
- Operational 1/20 degree Global SST analysis every day
- Delayed mode update of global analyses
- Operational regional ultra-high resolution operaitonal analyses in the Atlantic, Mediterranean and marginal ice zone every day
- A global GHRSST-PP Match-up Database
- The GHRSST-PP HR-DDS system
- Operational sea ice production
- Sustained verification and validation of MCS GDAC products and services
- A large on-line rolling store for data products
- Full mirror and handshake capability with the USA GDAC
- Independent interfaces to the GHRSST-PP NOAA/NODC">NOAA/NODC">NOAA/NODC">NOAA/NODC">LTSRF
The EU-GDAC is expected in late 2008 contact Herve Roquet (Herve.Roquet@meteo.fr) or Craig Donlon (Craig.Donlon@metoffice.gov.uk) for more information.
(Last Updated: 12-04-2007)