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Journal for accession number:  0119077
Created on:                    2014-06-03 01:32:37 UTC
By:                            Automated Ingest Agent

Source: Group for High Resolution Sea Surface Temperature

These data were submitted for archive to the NODC as part of the GHRSST
(Group for High Resolution Sea Surface Temperature) Program.  GHRSST
provides an operational international system that delivers a suite of
regional and global coverage high-resolution (typically 10 km or better in
space and daily or better in time) near-real time SST data products and
delayed mode climate data record SST products.

GHRSST is based on a global task-sharing system in which the data processing
operations are shared by Regional Data Assembly Centres (RDACs), Global Data
Assembly Centres (GDACs), and a Long Term Stewardship and Reanalysis
Facility (LTSRF, maintained by NODC). The RDACs generate specific Level 2
Pre-processed (L2P), Level 3 (L3U, L3C, or L3S), or Level 4 (L4) products
and submit those to the GDAC, where they are stored centrally, cataloged,
and served to near real time users.  After 30 days, the data are then
transferred to the LTSRF at NODC where they are archived for the long term
and provided to a wide range of users.

The definitions of the different processing levels are provided in the GDS2
document at https://www.ghrsst.org/documents/q/category/gds-documents/operational/
and also at http://data.nodc.noaa.gov/pathfinder/Version5.2/GDS_TechSpecs_v2.0.pdf.
For a complete description of GHRSST including data processing and data
specifications, please refer to the GHRSST site at http://www.ghrsst.org/.
GHRSST Data Specification version 1 (GDS1.x) data began arriving at the
LTSRF in 2005, and in 2013 GHRSST Data Specification version 2 (GDS 2.x)
began to arrive.

GHRSST data is received daily by the NODC 30 days after observation (prior
to 30 days it is available through the GDAC interface) through an automated
procedure made possible largely by the formalized procedures developed
within the GHRSST, especially those pertaining to data management, metadata,
and file naming conventions.  The basic strategy is to bring in data files
on a daily basis and corresponding metadata in XML format, then use a
combination of static information, information from the filenames,
information from within the XML metadata records, and information generated
by the NODC archive system to automatically create an archival information
package (an NODC accession) for each logical grouping of data (there may be
several each day) and then move the relevant data files (there may be
several per package) and metadata record (if present) into the NODC archive
file systems.  On a routine basis, an HTTP/FTP/OPeNDAP/TDS hierarchy is then
constructed of symbolic links pointing to the data and metadata residing in
the formal NODC archive file system.

For products submitted according to GDS1 specifications, each archival
package consists of a set of 1 or more netCDF-3 files, a corresponding File
Record (FR) metadata record in GCDM DIF format, and one FGDC XML record for
that day's worth of data for each product.  Any exceptions to this process
are noted below.  GDS1 datasets are limited to L2P and L4, as no official
GDS1 standard was ever established for L3 products.

For products submitted according to GDS2 specifications, only netCDF-4 data
files (for a limited period, netCDF-3 files were permitted by the GDS2) are
submitted to the LTSRF at NODC so the FR and FGDC metadata files are no
longer needed. Instead, a single ISO 19115-2 XML record is provided for each
GHRSST product, and the netCDF files contain all other needed metadata
attributes.

Summary of GHRSST data management structure:

1. Data processing is managed by a distributed system with international
   partners at Regional Data Assembly Centers (RDACs) around the world.

2. The RDACs generate data and metadata for L2P, L3U, L3C, L3S, and/or L4
   products.

3. All RDAC data streams are sent first to the GDAC at the NASA JPL/Caltech
   Physical Oceanography Distributed Active Archive Center (PO.DAAC). The
   PO.DAAC (http://podaac-www.jpl.nasa.gov/), provides critical data
   management functions and user access to the GHRSST data in near real
   time.

4. The GDAC system makes these data available to NODC 30 days after
   observation.

5. NODC, serving as the GHRSST LTSRF, archives the GHRSST data in perpetuity
   and provides numerous interoperable access and discovery mechanisms.

These data may be retrieved from the NODC via several mechanisms at:

1. NODC Geoportal Server: http://data.nodc.noaa.gov/geoportal
2. HTTP Server: http://data.nodc.noaa.gov/ghrsst
3. FTP Server: ftp://ftp.nodc.noaa.gov/pub/data.nodc/ghrsst
4. OPeNDAP Server: http://data.nodc.noaa.gov/opendap/ghrsst
5. THREDDS Data Server: http://data.nodc.noaa.gov/thredds/catalog/ghrsst/
6. Live Access Server: http://data.nodc.noaa.gov/las
7. NODC Ocean Archive System: http://www.nodc.noaa.gov/Archive/Search/

See the NODC GHRSST Web site: http://ghrsst.nodc.noaa.gov for more
information.

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The file about/GDS2-L4-GLOB-CMC-CMC0.2deg-v2-2014-104.xml is based on the
descriptive information provided by the GDAC granule search service.



