MI_Metadata:
File identifier:
Character string:
AVHRR_Pathfinder-NODC-L3C-v5.2
Hierarchy level:
MD_ScopeCode:
dataset
Metadata author:
CI_ResponsibleParty:
Individual name:
Character string:
Sheri Phillips
Organisation name:
Character string:
DOC/NOAA/NESDIS/NODC > National Oceanographic Data Center,
NESDIS, NOAA, U.S. Department of Commerce
Contact information:
CI_Contact:
Phone:
CI_Telephone:
Voice:
Character string:
(301) 713-3280 x127
Facsimile:
Character string:
(301) 713-3302
Address:
CI_Address:
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Character string:
SSMC3, 1315 East-West Highway, Mail Code
E/OC1
City:
Character string:
Silver Spring
Administrative area:
Character string:
MD
Postal code:
Character string:
20910-3282
Country:
Character string:
USA
Electronic mail address:
Character string:
Sheri.Phillips@noaa.gov
Hours of service:
Character string:
10:00 - 18:00 EST
Role:
CI_RoleCode:
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Date stamp:
Date:
2019-09-16
Metadata standard name:
Character string:
ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for
imagery and gridded data
Metadata standard version:
Character string:
ISO 19115-2:2009(E)
Spatial representation information:
MD_Georectified:
Number of dimensions:
Integer:
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Axis dimension properties:
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Dimension size:
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Axis dimension properties:
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row
Dimension size:
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Resolution:
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Axis dimension properties:
MD_Dimension:
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MD_DimensionNameTypeCode:
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Dimension size:
Integer:
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Resolution:
Cell geometry:
MD_CellGeometryCode:
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Transformation parameter availability:
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Check point availability:
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Corner points:
unknown
Point in pixel:
unknown
Identification information:
MD_DataIdentification:
Citation:
CI_Citation:
Title:
Character string:
AVHRR Pathfinder Version 5.2 Level 3 Collated (L3C) Global 4km Sea Surface Temperature for 1981-2012
Date:
CI_Date:
Date:
Date:
2012-12-07
Date type:
CI_DateTypeCode:
publication
Identifier:
MD_Identifier:
Authority:
CI_Citation:
Title:
Character string:
Coral Reef Information System
Date:
inapplicable
Cited responsible party:
CI_ResponsibleParty:
Contact information:
CI_Contact:
Online resource:
CI_OnlineResource:
Linkage:
URL:
https://www.coris.noaa.gov/metadata/records/ISO/html/iso_avhrr_pathfinder_nodc_l3c_v5_2.html
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information
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Identifier:
MD_Identifier:
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CI_Citation:
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unknown
Date:
unknown
Cited responsible party:
CI_ResponsibleParty:
Organisation name:
Character string:
DOC/NOAA/NESDIS/NODC >
National Oceanographic Data Center, NESDIS, NOAA,
U.S. Department of Commerce
Contact information:
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Character string:
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City:
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Silver
Spring
Administrative area:
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MD
Country:
Character string:
USA
Electronic mail address:
Character string:
NODC.Services@noaa.gov
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http://pathfinder.nodc.noaa.gov
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Character string:
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Cited responsible party:
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Kenneth S. Casey
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Character string:
DOC/NOAA/NESDIS/NODC > National
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Commerce
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Kenneth.Casey@noaa.gov
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The AVHRR Pathfinder Version 5.2 Sea Surface Temperature data
set (PFV52) is a collection of global, twice-daily 4km sea surface temperature
data produced in a partnership by the NOAA National Oceanographic Data Center
and the University of Miami's Rosenstiel School of Marine and Atmospheric
Science. PFV52 was computed from data from the AVHRR instruments on board NOAA's
polar orbiting satellite series using an entirely modernized system based on
SeaDAS. This system incorporates several key changes from Versions 5.0 and 5.1
of Pathfinder, including the use of an entirely new land mask, a modified grid,
and the inclusion of sea ice, wind speed, and aerosol ancillary data to support
the use of the SST data. Importantly, PFV52 data are provided in netCDF-4
(classic model, with internal compression and chunking) and are nearly 100%
compliant with the GHRSST Data Specification Version 2.0 for L3C products. These
data deviate from that standard only in that sses_bias, sses_standard_deviation,
and sst_dtime variables are empty. PFV52 data were collected through the
operational periods of the NOAA-7 through NOAA-18 Polar Operational
Environmental Satellites (POES), and are available for 1981 through 2012. Data
for all years are available as separate NODC accessions.
Credit:
Character string:
Please acknowledge the use of these data with the following
statement: These data were provided by GHRSST and the US National Oceanographic
Data Center.
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Character string:
NCEI Geoportal Filter
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SEA SURFACE TEMPERATURE
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theme
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satellite data
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Thesaurus name:
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missing
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EARTH SCIENCE > Oceans > Ocean Temperature > Sea Surface Temperature > AVHRR
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Thesaurus name:
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CoRIS Place Thesaurus
Date:
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Resource constraints:
MD_Constraints:
Use limitation:
Character string:
These data are available for use without
restriction.
Aggregation information:
MD_AggregateInformation:
Aggregate dataset name:
CI_Citation:
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Character string:
Group for High Resolution
SST
Date:
Association type:
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largerWorkCitation
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project
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NOAA Climate Data Record
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largerWorkCitation
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Character string:
Unidata Common Data
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Global Ocean
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The purpose of this data set is to provide sea surface
temperature data and related parameters with good temporal consistency, high
accuracy and spatial resolution, and for archive and distribution through the
NOAA National Oceanographic Data Center (NODC). This SST data collection is
intended primarily for climate related applications and studies and is produced
with partial support from the NOAA Climate Data Record Program. The Pathfinder
Version 5.2 data set follows the international format, content and metadata
standard defined by the Group for High Resolution Sea Surface Temperature
(GHRSST) in the GHRSST Data Specification Version 2.0 (GDS2.0). These data
deviate from that standard only in that sses_bias, sses_standard_deviation, and
sst_dtime variables are empty. The GDS2.0 Technical Specifications document can
be downloaded from the GHRSST Project Office at
https://www.ghrsst.org/documents/q/category/gds-documents/operational/.
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NOAA Climate Data Record of sea surface skin
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time difference from reference
time
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aerosol optical thickness
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wind_speed
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DOC/NOAA/NODC > National Oceanographic Data
Center, NOAA, U.S. Department of Commerce
Contact information:
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CI_Telephone:
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Character string:
(301)
713-3277
Facsimile:
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(301)
713-3302
Address:
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SSMC3, 1315 East West
Highway
City:
Character string:
Silver
Spring
Administrative area:
Character string:
MD
Postal code:
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20910-3282
Country:
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Electronic mail address:
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NODC.Services@noaa.gov
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free of charge.
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delivery on physical media, users are responsible for the cost
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product.
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2012-12-08T00:00:00
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netCDF4.
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CI_OnlineResource:
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CI_OnlineResource:
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NODC Archival Information Package
containing data for 1982.
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NODC Archival Information Package
containing data for 1984.
Function:
CI_OnLineFunctionCode:
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MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
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URL:
http://accession.nodc.noaa.gov/0073580
Protocol:
Character string:
http
Application profile:
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NODC Ocean Archive
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Description:
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NODC Archival Information Package
containing data for 1985.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073581
Protocol:
Character string:
http
Application profile:
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Name:
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NODC Ocean Archive
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Description:
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NODC Archival Information Package
containing data for 1986.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
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URL:
http://accession.nodc.noaa.gov/0073582
Protocol:
Character string:
http
Application profile:
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Name:
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NODC Ocean Archive
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Description:
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NODC Archival Information Package
containing data for 1987.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
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URL:
http://accession.nodc.noaa.gov/0073583
Protocol:
Character string:
http
Application profile:
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Name:
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NODC Ocean Archive
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Description:
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NODC Archival Information Package
containing data for 1988.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073584
Protocol:
Character string:
http
Application profile:
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Name:
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Description:
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NODC Archival Information Package
containing data for 1989.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073585
Protocol:
Character string:
http
Application profile:
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web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 1990.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073586
Protocol:
Character string:
http
Application profile:
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Name:
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NODC Ocean Archive
System
Description:
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NODC Archival Information Package
containing data for 1991.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073587
Protocol:
Character string:
http
Application profile:
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Name:
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NODC Ocean Archive
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Description:
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NODC Archival Information Package
containing data for 1992.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073588
Protocol:
Character string:
http
Application profile:
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Name:
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NODC Ocean Archive
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Description:
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NODC Archival Information Package
containing data for 1993.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073589
Protocol:
Character string:
http
Application profile:
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web browser
Name:
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NODC Ocean Archive
System
Description:
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NODC Archival Information Package
containing data for 1994.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073590
Protocol:
Character string:
http
Application profile:
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Name:
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NODC Ocean Archive
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NODC Archival Information Package
containing data for 1995.
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CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073591
Protocol:
Character string:
http
Application profile:
Character string:
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Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 1996.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073592
Protocol:
Character string:
http
Application profile:
Character string:
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Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 1997.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073593
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 1998.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073594
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 1999.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073595
Protocol:
Character string:
http
Application profile:
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Name:
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NODC Ocean Archive
System
Description:
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NODC Archival Information Package
containing data for 2000.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073596
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2001.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073597
Protocol:
Character string:
http
Application profile:
Character string:
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Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2002.
Function:
CI_OnLineFunctionCode:
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MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073598
Protocol:
Character string:
http
Application profile:
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web browser
Name:
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NODC Ocean Archive
System
Description:
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NODC Archival Information Package
containing data for 2003.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073599
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2004.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073600
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2005.
Function:
CI_OnLineFunctionCode:
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Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073601
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2006.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073602
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2007.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073603
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2008.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073604
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2009.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0073605
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2010.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://accession.nodc.noaa.gov/0099811
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC Ocean Archive
System
Description:
Character string:
NODC Archival Information Package
containing data for 2011.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://data.nodc.noaa.gov/pathfinder/Version5.2/
Protocol:
Character string:
http
Application profile:
Character string:
web browser
Name:
Character string:
NODC HTTP server
Description:
Character string:
Navigate to URL:
http://data.nodc.noaa.gov/pathfinder/Version5.2/ and
begin browsing through the file hierarchy. Clicking on
any of the files will prompt you to download that file
or will launch any application associated with netCDF
files.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
ftp://ftp.nodc.noaa.gov/pub/data.nodc/pathfinder/Version5.2/
Protocol:
Character string:
ftp
Application profile:
Character string:
Any FTP client
Name:
Character string:
NODC FTP server
Description:
Character string:
Navigate to URL:
ftp://ftp.nodc.noaa.gov/pub/data.nodc/pathfinder/Version5.2/
to download.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Online:
CI_OnlineResource:
Linkage:
URL:
http://data.nodc.noaa.gov/thredds/catalog/pathfinder/Version5.2/catalog.html
Protocol:
Character string:
THREDDS
Application profile:
Character string:
Various
Name:
Character string:
NODC THREDDS
server
Description:
Character string:
Thematic Realtime Environmental
Distributed Data Services. Provides various web services
for data access, including OPeNDAP, HTTP, Web Coverage
Service, Web Mapping Service, as well as NCML and ISO
views to the data.
Function:
CI_OnLineFunctionCode:
download
Distributor transfer options:
MD_DigitalTransferOptions:
Offline:
MD_Medium:
Name:
MD_MediumNameCode:
cdRom
Distributor transfer options:
MD_DigitalTransferOptions:
Offline:
MD_Medium:
Name:
MD_MediumNameCode:
dvd
Distributor transfer options:
MD_DigitalTransferOptions:
Offline:
MD_Medium:
Medium note:
Character string:
IBM LTO Tape
Data quality information:
DQ_DataQuality:
Scope:
#datasetScope
Report:
DQ_QuantitativeAttributeAccuracy:
Name of measure:
Character string:
FGDC Attribute Accuracy Report
Result:
DQ_QuantitativeResult:
Value unit:
inapplicable
Value:
Record:
Character string:
Quality indicators are provided for each
data file within the quality_level,
pathfinder_quality_level, and dt_analysis
variables.
Report:
DQ_ConceptualConsistency:
Name of measure:
Character string:
FGDC Logical Consistency Report
Result:
DQ_QuantitativeResult:
Value unit:
inapplicable
Value:
Record:
Character string:
Files are run against the program
(algorithm) MD5 to verify data integrity which generates a
code, called an MD5 checksum. After files are transferred
from one place to another, the program can be run on the
file again and a new code generated. The old MD5 checksum
code should be identical to the new MD5 checksum code. If
not, the file was somehow corrupted during transfer (see
original MD5 documentation at
http://www.isi.edu/in-notes/rfc1321.txt)
Report:
DQ_CompletenessOmission:
Name of measure:
Character string:
FGDC Completeness Report
Result:
DQ_QuantitativeResult:
Value unit:
inapplicable
Value:
Record:
Character string:
The SST data are nearly complete in the
sense that a value is available for nearly every pixel, with
the exception of some areas and times where some of the
input low-level AVHRR data were missing from the archive.
However, after application of the quality flag parameters,
the SST fields have extensive gaps due to clouds and other
factors which limit the quality of the observed SST.
Additional masking information is stored in the l2p_flags
variable, which contains bits encoded for the presence of
land, sea ice, lakes, and rivers. These data were collected
through the operational periods of the NOAA-7 through
NOAA-19 Polar Operational Environmental Satellite (POES). A
table listing which satellites were used in the generation
of Pathfinder V5.0 data for specific dates is available
online at:
http://www.nodc.noaa.gov/satellitedata/pathfinder4km/userguide.html.
Report:
DQ_AbsoluteExternalPositionalAccuracy:
Name of measure:
Character string:
FGDC Horizontal Positional Accuracy
Report
Result:
DQ_QuantitativeResult:
Value unit:
inapplicable
Value:
Record:
Character string:
The major sources of error in geo-locating
AVHRR data are (a) drift in the spacecraft clock (which
causes errors in the estimated along-track position), and
(b) uncertainty errors in spacecraft and sensor attitude.
(a) Clock Correction: To minimize error in the along track
position estimated by the orbital model, a satellite clock
correction factor is applied to the time code imbedded in
each piece. The method used to determine these clock
correction factors is presented below. The clock aboard a
given satellite drifts continually at a relatively constant
rate (e.g., for NOAA-14, ~9msday-1) compared to the
reference clock on Earth. Because of this drift, the
NOAA/NESDIS Satellite Operation Control Center periodically
sends a command to the satellite to reset the on-board clock
to a new baseline thereby eliminating the accumulation of a
large time offset error between the Earth and satellite
clocks.To correct for clock drift between these resets,
correction factors were determined from a database of
satellite clock time and Earth time offsets collected at the
RSMAS High Resolution Picture Transmission (HRPT) receiving
station. During HRPT transmission, both the satellite clock
(used to create the embedded time code in each piece) and
the Earth clock are simultaneously available. The clock
correction bias was determined by (1) visual examination of
the Earth/satellite clock differences collected in the
database to locate the precise magnitude and timing of clock
resets performed by the Satellite Operation Control Center
and (2) recorded time differences between the identified
reset periods were then filtered to remove spurious noise,
and regressed against the corresponding satellite time to
determine the clock drift correction. These drift
corrections were then applied to all data time-stamped
during a given reset period. Refer to Sea Surface
Temperature Global Area Coverage (GAC) Processing Appendix
A: Calibration and Navigation Correction Factors for a list
of clock offsets for each NOAA spacecraft
(http://www.rsmas.miami.edu/groups/rrsl/pathfinder/Processing/proc_app_a.html).(b)
Attitude Corrections - After clock correction, a nominal
attitude correction is then applied to minimize the
uncertainty in regard to the direction in which the
spacecraft is pointing. The nominal attitude correction
applied was determined by averaging the absolute attitude of
the spacecraft over many geographic locations and times
along the orbital track. The method used to determine the
absolute attitude of the spacecraft involves matching a
digital coastal outline to a given image and recording the
amount of pitch, yaw, and roll required to make the outline
and land coincide. This method has the advantage that it can
be performed over small geographical distances and is
similar to other techniques which rely on widely separated
geographical control points to anchor the navigation. The
resultant navigation information, output by the SECTOR
procedure for each piece, provides the mapping parameters
needed to convert between the satellite perspective of pixel
and scan line, and Earth-based latitude and longitude
coordinates. Refer to Sea Surface Temperature Global Area
Coverage (GAC) Processing Appendix A: Calibration and
Navigation Correction Factors for attitude correction
factors for each NOAA spacecraft
(http://www.rsmas.miami.edu/groups/rrsl/pathfinder/Processing/proc_app_a.html).
Report:
DQ_AbsoluteExternalPositionalAccuracy:
Name of measure:
Character string:
FGDC Vertical Positional Accuracy
Report
Result:
DQ_QuantitativeResult:
Value unit:
inapplicable
Value:
inapplicable
Data quality information:
DQ_DataQuality:
Scope:
DQ_Scope:
Hierarchy level:
MD_ScopeCode:
dataset
Lineage:
LI_Lineage:
Process step:
LE_ProcessStep:
Description:
Character string:
Pathfinder Version 5.2 data are produced from
Level 1b AVHRR Global Area Coverage (GAC) data using code based
on the SeaDAS v6.1 processing environment. The output of this
process is a collection of twice-daily, global Level 3 data
files in HDF4 format. The process requires several important
pieces of information, which are categorized by the following
four overall steps in the Pathfinder processing system (steps
A-D): A. Ingestion, calibration, and navigation of Global Area
Coverage (GAC) data. Sub-steps: a. Calibrate and convert AVHRR
digital counts for channels 1 through 5 to radiances - i. Obtain
AVHRR channels 1 through 5 radiometer count data; ii. Channels 1
and 2 require pre-launch calibration coefficients for linear
counts-to-radiance conversion, followed by a correction for
temporal changes using sensor decay rate data and then a
correction for inter-satellite differences using inter-satellite
standardization data to the NOAA-9 reference, both of which use
Libyan desert target area data; iii. Channels 3, 4, and 5
require both the pre-launch calibration data and onboard
blackbody (space view and sensor base plate) data for non-linear
counts-to-radiance conversion; b. Navigation, Clock, and
Attitude Corrections; i. Satellite clock corrections need Earth
time offset data based on RSMAS High-Resolution Picture
Transmission data; ii. Attitude corrections are made using
coastline comparison data; iii. At this point, navigated,
calibrated albedos/brightness temperatures are available for all
five channels. Note that channels 1-2 are not used in the
Pathfinder SST algorithm, and channel 3 is used only in
assignment of a quality indicator (see step B.d.i.). B. SST
Calculation. Sub-steps: a. Channel 4 and 5 brightness
temperatures are converted to SST in degrees C using the
Pathfinder algorithm, which requires a set of monthly
coefficients; b. These coefficients are derived using the
Pathfinder Buoy Matchup Database. This is a set of in situ buoy
SST observations and collocated AVHRR data; c. In addition, a
first-guess SST field is needed by the algorithm. This
first-guess field is the Reynolds Optimum Interpolation ¼-Degree
Daily SST Analysis version 2 (DOISSTv2) product, with inland
values populated from the AVHRR Pathfinder Version 5.0/5.1 daily
climatological SST. (For more information on this reference
field see http://accession.nodc.noaa.gov/0071185). Note:
Pathfinder Version 5.0 used the Reynolds Weekly Global Optimally
Interpolated SST Version 2 (OISSTv2); d. Quality Flag Assignment
- i. A Channel 3, 4, and 5 brightness temperature test is
performed. These data are already available from step A.a.iii;
ii. The viewing angle is evaluated using a satellite zenith
angle check; iii. A reference field comparison check is made
against the Reynolds DOISSTv2 used in step B.c.; iv. A stray
sunlight test is performed which requires information on whether
the data in question are to left or right of nadir; v. An edge
test is performed which checks the location of the pixel within
a scan line and the location of the scan line within the
processing piece (a 'piece' is a subset of an entire orbit
file); vi. A glint test is performed which requires a glint
index calculated according to the Cox and Munk (1954)
formulation; vii. The preceding steps are all combined into an
overall quality flag assignment for each pixel. C. Spatial
Binning. Sub-steps: a. An equal-area grid is defined into which
GAC pixels are binned. No external data are needed, only
information on the equal-area binning strategy itself; b. A
data-day is defined following a spatial data-day definition. See
http://www.nodc.noaa.gov/satellitedata/pathfinder4km/Data-day.pdf for a
description of the spatial data-day definition, written by
Guillermo Podesta, University of Miami RSMAS; c. A land mask is
applied to the dataset, identifying pixels that fall on land.
This land mask was generated by rasterizing the Global
Self-consistent Hierarchical High-resolution Shoreline (GSHHS)
Database from the NOAA National Geophysical Data Center. Any 4km
Pathfinder pixel whose area is 50% or more covered by land is
considered land in this land mask. Inland water bodies were
incorporated into this land mask by rasterizing the US World
Wildlife Fund's Global Lakes and Wetlands Database. Any 4km
Pathfinder pixel whose area is 50% or more covered by lake or
river was considered water for in this land mask. D. Temporal
Binning. Sub-steps: a. The spatially binned pieces from step C
are accumulated into a single ascending (daytime) or descending
(nighttime) file for each day. In case of overlapping satellite
passes, only the best pixels of equivalent quality are binned.
No external information is needed, only information about the
accumulation procedure itself; b. Fields are reprojected from
equal-area to the 8640x4320 equal-angle
grid.
Date and time:
inapplicable
Processor:
CI_ResponsibleParty:
Individual name:
Character string:
Robert Evans
Organisation name:
Character string:
University of Miami Rosenstiel School
of Marine and Atmospheric Science
Position name:
Character string:
Research
Professor
Contact information:
CI_Contact:
Phone:
CI_Telephone:
Voice:
Character string:
(305)421-4799
Address:
CI_Address:
Delivery point:
Character string:
4600 Rickenbacker
Causeway
City:
Character string:
Miami
Administrative area:
Character string:
FL
Postal code:
Character string:
33149
Electronic mail address:
Character string:
revans@rsmas.miami.edu
Hours of service:
Character string:
9 - 5 EST
Role:
CI_RoleCode:
principalInvestigator
Process step:
LE_ProcessStep:
Description:
Character string:
Twice-daily global L3 Pathfinder files in HDF4
are transferred from the University of Miami to the National
Oceanographic Data Center, where they are converted into
GDS2.0-compliant netCDF4. Details of this process are as
follows: 1. Start time, end time, satellite ID, and orbit node
(ascending or descending) are read from the input L3 HDF file
and used to generate the name of the output netCDF file. (Note:
The GDS2.0 standard requires the center time of collation to be
the indicative time used in the filename for an L3C file.); 2.
The reference time of the HDF file is converted to GDS2.0
"seconds since 1981-01-01 00:00:00" format and written to the
netCDF file along with latitude and longitude values for the
Pathfinder Version 5.2 grid; 3. Sea surface temperature data
from the HDF "SST" file are written to the
sea_surface_temperature variable in the netCDF file; 4.
GDS2.0-required variables sst_dtime, sses_bias, and
sses_standard_deviation are written to the netCDF file and
populated with fill values. Note: Pathfinder Version 6.0 will
contain actual values for these three variables; 5. Reference
SST data from the corresponding HDF "REF" file are combined with
the SST data to populate the dt_analysis variable in the netCDF
file; 6. Wind speed data are written to the wind_speed variable
in the netCDF file. These data are created by the NCEP-DOE
Atmospheric Model Intercomparison Project (AMIP-II) reanalysis
(R-2) and represent winds at 10 meters above the sea surface.
They are interpolated to the Pathfinder Version 5.2 grid prior
to processing; 7. Sea ice data are written to the
sea_ice_fraction variable in the netCDF file. These data are
taken from the EUMETSAT Ocean and Sea Ice Satellite Application
Facility (OSISAF) Global Daily Sea Ice Concentration
Reprocessing Data Set (http://accession.nodc.noaa.gov/0068294)
when these data are available. The data are reprojected and
interpolated from their original polar stereographic projection
at 10km spatial resolution to the 4km Pathfinder Version 5.2
grid. When the OSISAF data are not available for both
hemispheres on a given day, the sea ice concentration data are
taken from the sea_ice_fraction variable found in the L4 GHRSST
DailyOI SST product from NOAA/NCDC, and are interpolated from
the 25km DailyOI grid to the 4km Pathfinder Version 5.2 grid; 8.
Aerosol data are written to the aerosol_dynamic_indicator and
adi_dtime_from_sst variables in the netCDF file. These data are
pulled from three different sources and interpolated to the
Pathfinder Version 5.2 grid prior to processing. For 1981-2000,
AVHRR Pathfinder Atmospheres (PATMOS-A2) data from the NOAA
Office of Satellite Data Processing and Distribution (OSDPD) are
used. For 2003-2009, AVHRR Pathfinder Atmospheres - Extended
(PATMOS-X) data from NOAA OSDPD are used. For 2001-2002
2012, data are taken from the OMI/Aura Aerosol Optical Depth and
Single Scattering Albedo Daily L2 Global 0.25 degree gridded
v003 product (OMAEROG), produced by the US NASA Goddard Earth
Sciences Data and Information Services Center; 9. Original
Pathfinder quality levels are read from the HDF file, mapped to
the 6 quality levels required by the GDS2.0, and written to the
variable quality_level in the netCDF file. The quality levels
are as follows: GDS quality_level 5 = native Pathfinder quality
level 7 == best_quality; GDS quality_level 4 = native Pathfinder
quality_level 4-6 == acceptable_quality; GDS quality_level 3 =
native Pathfinder quality level 2-3 == low_quality; GDS
quality_level 2 = native Pathfinder quality level 1 ==
worst_quality; GDS quality_level 1 = native Pathfinder quality
level 0 == bad_data; GDS quality_level 0 = native Pathfinder
quality level -1 == missing_data; 10. The original Pathfinder
quality level is written to the optional variable
pathfinder_quality_level in the netCDF file; 11. River, lake,
and land information from the Pathfinder Version 5.2 land mask,
as well as sea ice presence information from the sea ice data
described previously, are encoded in bits and written to the bit
mask variable l2p_flags in the netCDF file; 12. Global
attributes are written to the netCDF file according to GDS2.0
requirements; 13. Final AVHRR Pathfinder Version 5.2 data are
quality assured through browse graphic generation and
inspection. Upon completion of the quality assurance routines,
the data are archived by the National Oceanographic Data Center
and published online.
Date and time:
inapplicable
Processor:
CI_ResponsibleParty:
Individual name:
Character string:
Kenneth Casey
Organisation name:
Character string:
DOC/NOAA/NESDIS/NODC > National
Oceanographic Data Center, NESDIS, NOAA, U.S. Department
of Commerce
Position name:
Character string:
Technical
Director
Contact information:
CI_Contact:
Phone:
CI_Telephone:
Voice:
Character string:
(301)713-3272
x133
Address:
CI_Address:
Delivery point:
Character string:
1315 East West Highway, SSMC3
E/OC
City:
Character string:
Silver
Spring
Administrative area:
Character string:
MD
Postal code:
Character string:
20910
Electronic mail address:
Character string:
Kenneth.Casey@noaa.gov
Hours of service:
Character string:
7 - 4 EST
Role:
CI_RoleCode:
pointOfContact
Metadata constraints:
MD_LegalConstraints:
Use limitation:
Character string:
Disclaimer - While every effort has been made to ensure that
these data are accurate and reliable within the limits of the current state of
the art, NOAA cannot assume liability for any damages caused by any errors or
omissions in the data, nor as a result of the failure of the data to function on
a particular system. NOAA makes no warranty, expressed or implied, nor does the
fact of distribution constitute such a warranty.
Metadata maintenance:
MD_MaintenanceInformation:
Maintenance and update frequency:
MD_MaintenanceFrequencyCode:
asNeeded
Date of next update:
Date:
20130630
Maintenance note:
Character string:
This record will be translated to FGDC for inclusion in NODC
Web Accessible Folders.
Acquisition information:
MI_AcquisitionInformation:
Instrument:
MI_Instrument:
Citation:
CI_Citation:
Title:
Character string:
Advanced Very High Resolution Radiometer -
AVHRR
Date:
CI_Date:
Date:
unknown
Date type:
CI_DateTypeCode:
publication
Cited responsible party:
CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA > National Oceanic and
Atmospheric Administration, U.S. Department of
Commerce
Role:
CI_RoleCode:
originator
Identifier:
MD_Identifier:
Code:
Character string:
AVHRR > Advanced Very High Resolution
Radiometer
Type:
Character string:
radiometer
Description:
Character string:
The AVHRR/3 is a six-channel imaging radiometer which
detects energy in the visible and infrared (IR) portions of the
electromagnetic spectrum. The instrument measures reflected solar
(visible and near-IR) energy and radiated thermal energy from land, sea,
clouds, and the intervening atmosphere. The instrument has an
instantaneous field-of-view (IFOV) of 1.3 milliradians providing a
nominal spatial resolution of 1.1 km (0.69 mi) at nadir. A continuously
rotating elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six revolutions
per second to provide continuous coverage. The AVHRR/3 provides spectral
and gain improvements to the solar visible channels that provide low
light energy detection. Channel 3A, at 1.6 microns, provides snow, ice,
and cloud discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of continuous
data. An external sun shield and an internal baffle have been added to
reduce sunlight impingement into the instruments optical cavity and
detectors. An AVHRR instrument is flown on board each of the NOAA Polar
Operational Environmental Satellites (POES). For these satellites, the
hysteris scan mirror has been replaced with a Brushless DC motor. This
motor is more reliable and operates with significantly reduced
jitter.
Platform:
MI_Platform:
Identifier:
MD_Identifier:
Code:
Character string:
NOAA-7 Satellite
Description:
Character string:
Launched: June 23, 1981. Instruments: AVHRR, TOVS,
DCLS, SEM. Status: Retired. Orbit:
Sun-synchronous.
Sponsor:
CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA/OSO > Office of Satellite
Operations, National Oceanic and Atmospheric Administration,
U.S. Department of Commerce
Role:
CI_RoleCode:
originator
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CI_Citation:
Title:
Character string:
Advanced Very High Resolution
Radiometer - AVHRR
Date:
CI_Date:
Date:
unknown
Date type:
CI_DateTypeCode:
publication
Cited responsible party:
CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA > National
Oceanic and Atmospheric Administration, U.S.
Department of Commerce
Role:
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originator
Identifier:
MD_Identifier:
Code:
Character string:
AVHRR > Advanced Very High
Resolution Radiometer
Type:
Character string:
radiometer
Description:
Character string:
The AVHRR/3 is a six-channel imaging radiometer
which detects energy in the visible and infrared (IR) portions
of the electromagnetic spectrum. The instrument measures
reflected solar (visible and near-IR) energy and radiated
thermal energy from land, sea, clouds, and the intervening
atmosphere. The instrument has an instantaneous field-of-view
(IFOV) of 1.3 milliradians providing a nominal spatial
resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating
elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six
revolutions per second to provide continuous coverage. The
AVHRR/3 provides spectral and gain improvements to the solar
visible channels that provide low light energy detection.
Channel 3A, at 1.6 microns, provides snow, ice, and cloud
discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of
continuous data. An external sun shield and an internal baffle
have been added to reduce sunlight impingement into the
instruments optical cavity and detectors. An AVHRR instrument is
flown on board each of the NOAA Polar Operational Environmental
Satellites (POES). For these satellites, the hysteris scan
mirror has been replaced with a Brushless DC motor. This motor
is more reliable and operates with significantly reduced
jitter.
Platform:
MI_Platform:
Identifier:
MD_Identifier:
Code:
Character string:
NOAA-9 Satellite
Description:
Character string:
Launched: December 12, 1984. Instruments: AVHRR, TOVS,
DCLS, SEM, ERBE, SARSAT, SBUV/2. Status: Retired. Orbit:
Sun-synchronous.
Sponsor:
CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA/OSO > Office of Satellite
Operations, National Oceanic and Atmospheric Administration,
U.S. Department of Commerce
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originator
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Character string:
Advanced Very High Resolution
Radiometer - AVHRR
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CI_Date:
Date:
unknown
Date type:
CI_DateTypeCode:
publication
Cited responsible party:
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Individual name:
Character string:
US DOC/NOAA > National
Oceanic and Atmospheric Administration, U.S.
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originator
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Code:
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AVHRR > Advanced Very High
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Type:
Character string:
radiometer
Description:
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The AVHRR/3 is a six-channel imaging radiometer
which detects energy in the visible and infrared (IR) portions
of the electromagnetic spectrum. The instrument measures
reflected solar (visible and near-IR) energy and radiated
thermal energy from land, sea, clouds, and the intervening
atmosphere. The instrument has an instantaneous field-of-view
(IFOV) of 1.3 milliradians providing a nominal spatial
resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating
elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six
revolutions per second to provide continuous coverage. The
AVHRR/3 provides spectral and gain improvements to the solar
visible channels that provide low light energy detection.
Channel 3A, at 1.6 microns, provides snow, ice, and cloud
discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of
continuous data. An external sun shield and an internal baffle
have been added to reduce sunlight impingement into the
instruments optical cavity and detectors. An AVHRR instrument is
flown on board each of the NOAA Polar Operational Environmental
Satellites (POES). For these satellites, the hysteris scan
mirror has been replaced with a Brushless DC motor. This motor
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Platform:
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Identifier:
MD_Identifier:
Code:
Character string:
NOAA-11 Satellite
Description:
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Launched: September 24, 1988. Instruments: AVHRR, TOVS,
DCS, SAR, SBUV/2. Status: Retired. Orbit:
Sun-synchronous.
Sponsor:
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Individual name:
Character string:
US DOC/NOAA/OSO > Office of Satellite
Operations, National Oceanic and Atmospheric Administration,
U.S. Department of Commerce
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originator
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CI_Citation:
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Character string:
Advanced Very High Resolution
Radiometer - AVHRR
Date:
CI_Date:
Date:
unknown
Date type:
CI_DateTypeCode:
publication
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CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA > National
Oceanic and Atmospheric Administration, U.S.
Department of Commerce
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originator
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Code:
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AVHRR > Advanced Very High
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radiometer
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The AVHRR/3 is a six-channel imaging radiometer
which detects energy in the visible and infrared (IR) portions
of the electromagnetic spectrum. The instrument measures
reflected solar (visible and near-IR) energy and radiated
thermal energy from land, sea, clouds, and the intervening
atmosphere. The instrument has an instantaneous field-of-view
(IFOV) of 1.3 milliradians providing a nominal spatial
resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating
elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six
revolutions per second to provide continuous coverage. The
AVHRR/3 provides spectral and gain improvements to the solar
visible channels that provide low light energy detection.
Channel 3A, at 1.6 microns, provides snow, ice, and cloud
discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of
continuous data. An external sun shield and an internal baffle
have been added to reduce sunlight impingement into the
instruments optical cavity and detectors. An AVHRR instrument is
flown on board each of the NOAA Polar Operational Environmental
Satellites (POES). For these satellites, the hysteris scan
mirror has been replaced with a Brushless DC motor. This motor
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NOAA-14 Satellite
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Launched: December 29, 1994. Instruments: AVHRR, TOVS,
ARGOS, SARSAT, SEM, RAIDS. Status: Retired. Orbit:
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US DOC/NOAA/OSO > Office of Satellite
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originator
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Advanced Very High Resolution
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unknown
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CI_DateTypeCode:
publication
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Character string:
US DOC/NOAA > National
Oceanic and Atmospheric Administration, U.S.
Department of Commerce
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originator
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AVHRR > Advanced Very High
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radiometer
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The AVHRR/3 is a six-channel imaging radiometer
which detects energy in the visible and infrared (IR) portions
of the electromagnetic spectrum. The instrument measures
reflected solar (visible and near-IR) energy and radiated
thermal energy from land, sea, clouds, and the intervening
atmosphere. The instrument has an instantaneous field-of-view
(IFOV) of 1.3 milliradians providing a nominal spatial
resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating
elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six
revolutions per second to provide continuous coverage. The
AVHRR/3 provides spectral and gain improvements to the solar
visible channels that provide low light energy detection.
Channel 3A, at 1.6 microns, provides snow, ice, and cloud
discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of
continuous data. An external sun shield and an internal baffle
have been added to reduce sunlight impingement into the
instruments optical cavity and detectors. An AVHRR instrument is
flown on board each of the NOAA Polar Operational Environmental
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Code:
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NOAA-16 Satellite
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Launched: September 21, 2000. Instruments: AVHRR,
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US DOC/NOAA/OSO > Office of Satellite
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originator
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Advanced Very High Resolution
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unknown
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publication
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US DOC/NOAA > National
Oceanic and Atmospheric Administration, U.S.
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originator
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AVHRR > Advanced Very High
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radiometer
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The AVHRR/3 is a six-channel imaging radiometer
which detects energy in the visible and infrared (IR) portions
of the electromagnetic spectrum. The instrument measures
reflected solar (visible and near-IR) energy and radiated
thermal energy from land, sea, clouds, and the intervening
atmosphere. The instrument has an instantaneous field-of-view
(IFOV) of 1.3 milliradians providing a nominal spatial
resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating
elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six
revolutions per second to provide continuous coverage. The
AVHRR/3 provides spectral and gain improvements to the solar
visible channels that provide low light energy detection.
Channel 3A, at 1.6 microns, provides snow, ice, and cloud
discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of
continuous data. An external sun shield and an internal baffle
have been added to reduce sunlight impingement into the
instruments optical cavity and detectors. An AVHRR instrument is
flown on board each of the NOAA Polar Operational Environmental
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mirror has been replaced with a Brushless DC motor. This motor
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Identifier:
MD_Identifier:
Code:
Character string:
NOAA-17 Satellite
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Launched: June 24, 2002. Instruments: AVHRR, HIRS/3,
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Character string:
US DOC/NOAA/OSO > Office of Satellite
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originator
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CI_Citation:
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Advanced Very High Resolution
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unknown
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CI_DateTypeCode:
publication
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Character string:
US DOC/NOAA > National
Oceanic and Atmospheric Administration, U.S.
Department of Commerce
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originator
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AVHRR > Advanced Very High
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Character string:
radiometer
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The AVHRR/3 is a six-channel imaging radiometer
which detects energy in the visible and infrared (IR) portions
of the electromagnetic spectrum. The instrument measures
reflected solar (visible and near-IR) energy and radiated
thermal energy from land, sea, clouds, and the intervening
atmosphere. The instrument has an instantaneous field-of-view
(IFOV) of 1.3 milliradians providing a nominal spatial
resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating
elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six
revolutions per second to provide continuous coverage. The
AVHRR/3 provides spectral and gain improvements to the solar
visible channels that provide low light energy detection.
Channel 3A, at 1.6 microns, provides snow, ice, and cloud
discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of
continuous data. An external sun shield and an internal baffle
have been added to reduce sunlight impingement into the
instruments optical cavity and detectors. An AVHRR instrument is
flown on board each of the NOAA Polar Operational Environmental
Satellites (POES). For these satellites, the hysteris scan
mirror has been replaced with a Brushless DC motor. This motor
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MI_Platform:
Identifier:
MD_Identifier:
Code:
Character string:
NOAA-18 Satellite
Description:
Character string:
Launched: May 20, 2005. Instruments: AVHRR, HIRS/3,
AMSU/A, AMSU/B, SEM-2, SBUV/2, SARSAT, DCS-2. Status: PM Secondary.
Orbit: Sun-synchronous.
Sponsor:
CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA/OSO > Office of Satellite
Operations, National Oceanic and Atmospheric Administration,
U.S. Department of Commerce
Role:
CI_RoleCode:
originator
Instrument:
MI_Instrument:
Citation:
CI_Citation:
Title:
Character string:
Advanced Very High Resolution
Radiometer - AVHRR
Date:
CI_Date:
Date:
unknown
Date type:
CI_DateTypeCode:
publication
Cited responsible party:
CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA > National
Oceanic and Atmospheric Administration, U.S.
Department of Commerce
Role:
CI_RoleCode:
originator
Identifier:
MD_Identifier:
Code:
Character string:
AVHRR > Advanced Very High
Resolution Radiometer
Type:
Character string:
radiometer
Description:
Character string:
The AVHRR/3 is a six-channel imaging radiometer
which detects energy in the visible and infrared (IR) portions
of the electromagnetic spectrum. The instrument measures
reflected solar (visible and near-IR) energy and radiated
thermal energy from land, sea, clouds, and the intervening
atmosphere. The instrument has an instantaneous field-of-view
(IFOV) of 1.3 milliradians providing a nominal spatial
resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating
elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six
revolutions per second to provide continuous coverage. The
AVHRR/3 provides spectral and gain improvements to the solar
visible channels that provide low light energy detection.
Channel 3A, at 1.6 microns, provides snow, ice, and cloud
discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of
continuous data. An external sun shield and an internal baffle
have been added to reduce sunlight impingement into the
instruments optical cavity and detectors. An AVHRR instrument is
flown on board each of the NOAA Polar Operational Environmental
Satellites (POES). For these satellites, the hysteris scan
mirror has been replaced with a Brushless DC motor. This motor
is more reliable and operates with significantly reduced
jitter.
Platform:
MI_Platform:
Identifier:
MD_Identifier:
Code:
Character string:
NOAA-19 Satellite
Description:
Character string:
Launched: February 6, 2009. Instruments: AVHRR/3,
HIRS/4, AMSU/A, MHS, SEM-2, SBUV/2, SAR, ADCS. Status: PM Secondary.
Orbit: Sun-synchronous.
Sponsor:
CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA/OSO > Office of Satellite
Operations, National Oceanic and Atmospheric Administration,
U.S. Department of Commerce
Role:
CI_RoleCode:
originator
Instrument:
MI_Instrument:
Citation:
CI_Citation:
Title:
Character string:
Advanced Very High Resolution
Radiometer - AVHRR
Date:
CI_Date:
Date:
unknown
Date type:
CI_DateTypeCode:
publication
Cited responsible party:
CI_ResponsibleParty:
Individual name:
Character string:
US DOC/NOAA > National
Oceanic and Atmospheric Administration, U.S.
Department of Commerce
Role:
CI_RoleCode:
originator
Identifier:
MD_Identifier:
Code:
Character string:
AVHRR > Advanced Very High
Resolution Radiometer
Type:
Character string:
radiometer
Description:
Character string:
The AVHRR/3 is a six-channel imaging radiometer
which detects energy in the visible and infrared (IR) portions
of the electromagnetic spectrum. The instrument measures
reflected solar (visible and near-IR) energy and radiated
thermal energy from land, sea, clouds, and the intervening
atmosphere. The instrument has an instantaneous field-of-view
(IFOV) of 1.3 milliradians providing a nominal spatial
resolution of 1.1 km (0.69 mi) at nadir. A continuously rotating
elliptical scan mirror provides the cross-track scan, scanning
the Earth from ± 55.4° from nadir. The mirror scans at six
revolutions per second to provide continuous coverage. The
AVHRR/3 provides spectral and gain improvements to the solar
visible channels that provide low light energy detection.
Channel 3A, at 1.6 microns, provides snow, ice, and cloud
discrimination. Channel 3A will be time-shared with the 3.7-
micron channel, designated 3B, to provide five channels of
continuous data. An external sun shield and an internal baffle
have been added to reduce sunlight impingement into the
instruments optical cavity and detectors. An AVHRR instrument is
flown on board each of the NOAA Polar Operational Environmental
Satellites (POES). For these satellites, the hysteris scan
mirror has been replaced with a Brushless DC motor. This motor
is more reliable and operates with significantly reduced
jitter.