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2006-09-27 21:12:54 +0000: Journal for accession number: 0007334
Created on:                    2006-09-27 21:12:54 +0000
By:                            Kenneth S. Casey, OC1, SSMC3 4853, +13017133272 x133

Source:



   GODAE High Resolution Sea Surface Temperature Pilot Project Data

These data were submitted for archival to the NODC as part of the GHRSST-PP
(Global Ocean Data Assimilation Experiment (GODAE) High Resolution Sea
Surface Temperature Pilot Project). The purpose of the GHRSST-PP 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. The
GHRSST-PP 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-PP including data processing and
metadata specifications, please refer to: The Recommended GHRSST-PP Data
Processing Specification GDS (Version 1 revision 1.5), GHRSST-PP Report
Number 17, compiled by Craig Donlon (craig.donlon@metoffice.com) and the
GHRSST-PP Science Team, Published by the International GHRSST-PP Project
Office, Met Office, Fitzroy Road, Exeter, EX3 1PB, United Kingdom,
downloadable from the References section of the GHRSST-PP site at:
http://www.ghrsst-pp.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-PP is made available in perpetuity.

GHRSST-PP 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-PP, 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-PP 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-PP 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-PP 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-PP 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 mathcup 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 GRHSST-PP 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://data.nodc.noaa.gov/pub/data.nodc/ghrsst
4. OPeNDAP Server: http://data.nodc.noaa.gov/cgi-bin/nph-dods/ghrsst

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

Files:

L4/MED/EUR/2005/140/FGDC-20050520-EUR-L4UHFnd-MED-v01.xml -
	FGDC metadata record describing the following data files in this
	accession:

20050520-EUR-L4UHFnd-MED-v01.nc.bz2
FR-20050520-EUR-L4UHFnd-MED-v01.xml

NODC updates to metadata:

1.1 Citation 8.4 Title: appended " for 2005-05-20 (NODC Accession 0007334)"
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 -5.990 to -5.990
1.5.1.2 East Bounding Coordinate: changed from 36.490 to 36.490
1.5.1.3 North Bounding Coordinate: changed from 45.990 to 45.990
1.5.1.4 South Bounding Coordinate: changed from 30.010 to 30.010
6.2 Resource Description: set to "NODC Accession 0007334"
6.4.2.1.7 Transfer Size: changed from 15000000 to 0.657 (actual)
6.4.2.1.7 Transfer Size: changed from 15000000 to 0.657 (actual)
6.4.2.1.7 Transfer Size: changed from 15000000 to 0.657 (actual)
7.1 Metadata Date: changed from 20041023 to 20060927
7.2 Metadata Review Date: changed from 20041023 to 20060927
7.3 Metadata Future Review Date: changed from 20050331 to 20070927
