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Journal for accession number: 0071911
Created on:                    2011-04-04 09:24:31 UTC
By:                            Automated Ingest Agent

Source: Group for High Resolution Sea Surface Temperature Data

These data were submitted for archival to the NODC as part of the GHRSST
(Group for High Resolution Sea Surface Temperature) Program. The purpose of
GHRSST is to develop an operational demonstration system that will deliver
global coverage high-resolution (better than 10 km and ~6 hourly) 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 ingest, quality
control and merge existing satellite and in situ SST data sources that are
then merged together to generate regional coverage SST data products having
the same netCDF format specification (called L2P products), in real-time.
RDAC data products are then assembled together at the GDAC(s) where they
are merged to provide L4 global coverage data products free of gaps. The
RDACs can also contribute both global and regional L4 products as well.
For a complete description of GHRSST including data processing and metadata
specifications, please refer to: The Recommended GHRSST Data Processing
Specification GDS (Version 1 revision 1.5), GHRSST Report Number 17,
compiled by Craig Donlon (craig.donlon@metoffice.com) and the GHRSST
Science Team, Published by the International GHRSST Project Office, Met
Office, Fitzroy Road, Exeter, EX3 1PB, United Kingdom, downloadable from
the References section of the GHRSST site at: http://www.ghrsst.org/.  The
role of the NODC within this international project is to serve as the long
term stewardship center where reprocessing efforts to create
climate-quality SST products take place, and where all GHRSST data is made
available in perpetuity.

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
and corresponding FGDC metadata in XML format on a daily basis, then use a
combination of static information, information from the XML filenames,
information from within the XML metadata records, and information generated
by the NODC archive system to automatically create an ATDB entry and
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 accession)
and FGDC record into the NODC archive file systems.  On a routine basis, an
http/ftp/OPeNDAP hierarchy is then constructed of symbolic links pointing
to the data and metadata residing in the formal NODC archive file system.

The GHRSST data streams consist of several types of data and metadata.  Two
types of data managed using the procedures documented here make up the core
of the GHRSST system. These data types, in netCDF format, are:

1. Level 2 Preprocessed (L2P): Individual satellite sensor observations
   processed into geophysical units (SST in degrees C) and formatted
   according to the GHRSST Data Processing Specifications (GDS v1.5,
   GHRSST/17).

2. Level 4 Analyzed (L4): These are uniformly gridded and gap-free products
   created by optimally merging multiple L2P inputs.

Both L2P and L4 data are stored in netCDF format following the procedures
detailed in the GDS.  The netCDF files are compressed using bzip2
compression and can be decompressed with freely-available software
(http://www.bzip.org/).

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 GCMD-DIF style metadata for L2P data streams
   as well as L4 products, along with matchup database (MDB) and high
   resolution diagnostic data set (HR-DDS) information.

3. All RDAC data streams are sent first to the Global Data Assembly Center
   (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 these
   real-time data. The PO.DAAC holds the data in a 30 day rolling store,
   and constructs an XML-formatted FGDC-compliant metadata record for each
   logical grouping of data (an NODC "Accession") based on the GCMD-DIF
   style metadata mandated as part of the GHRSST system.

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

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

1. NODC Ocean Archive System: http://www.nodc.noaa.gov/search/prod/
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/

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

Files:

L4/GLOB/UKMO/OSTIA/2011/059/FGDC-20110228-UKMO-L4HRfnd-GLOB-v01-OSTIA.xml -
   FGDC metadata record describing the following data files in this
   accession:

20110228-UKMO-L4HRfnd-GLOB-v01-fv02-OSTIA.nc.bz2
FR-20110228-UKMO-L4HRfnd-GLOB-v01-fv02-OSTIA.xml

NODC updates to metadata:

1.1 Citation 8.4 Title: appended " for 2011-02-28 (NODC Accession 0071911)"
1.5.1 Bounding Coordinates: calculated by finding the maximum and
  minimum range domains for the Latitude and Longitude attributes in
  this accession's 1 constituent entities identified in section
  5: Entity and Attribute Information
1.5.1.1 West Bounding Coordinate: changed from -180.000 to -180.000
1.5.1.2 East Bounding Coordinate: changed from 180.000 to 180.000
1.5.1.3 North Bounding Coordinate: changed from 90.000 to 90.000
1.5.1.4 South Bounding Coordinate: changed from -90.000 to -90.000
6.2 Resource Description: set to "NODC ACCESSION # 0071911"
6.4.2.1.7 Transfer Size: changed from 15000000 to 6.997 (actual)
6.4.2.1.7 Transfer Size: changed from 15000000 to 6.997 (actual)
6.4.2.1.7 Transfer Size: changed from 15000000 to 6.997 (actual)
7.1 Metadata Date: changed from 20041023 to 20110404
7.2 Metadata Review Date: changed from 20041023 to 20110404
7.3 Metadata Future Review Date: changed from 20050331 to 20120404