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Metadata Identifier: gov.noaa.ngdc.mgg.geophysics:G01330

Aggregation Info | Bands | Citations | Constraints | Coverage Descriptions | Dimensions | Extents | Formats | Geographic Bounding Box
Georectified Information | Georeferenceable Information | Identifiers | Instruments | Mediums | OnlineResources | Operations
Platforms | Process Steps | Range Elements | Reference Systems | Responsible Parties | Series | Sources | Spatial Grids | Temporal Extents

MD_DataIdentification

Count Component Title Abstract
1 Gravity Field Atlas of the S. Ocean This Gravity Field Atlas of the Southern Ocean from GEOSAT is MGG Report 7. In many areas of the global ocean, the depth of the seafloor is not well known because survey lines by ships are hundreds of kilometers apart. Satellites carrying radar altimeters have measured the shape of the ocean along tracks only 3-4 km apart, and from these data we can make very accuratore (+/-3mGal) and high resolution (15km) maps of the marine gravity field. The gravity field mimics the seafloor topography in the 15-160 km wavelength band if sediment cover on the ocean floor is thin. Long-wavelength (greater than 160 km) topography is isostatically compensated and is not correlated with the gravity field. In addition, the satellite gravity field and the available depth measurements were used to determine the correlation between gravity and the seafloor topography. By applying this correlation to the gravity field we predict seafloor topography in the 15-160 km wavelength band. This topography is combined with a long-wavelength component estimated directly from ship depth measurements. The result reveals many new features and is within +/- 100m of actual depths in many cases. The Predicted Seafloor Topography derived from the depths estimated from Satellite Altimetry in combination with measured trackline bathymetry is an inferred data set and is not true bathymetry. It is, however, the best estimate of seafloor topography available resulting from satellite gravity data and actual ship depth measurements. These data are intended for scientific research and should not be used for navigational purposes. Additional software is required in order to manipulate the data or produce your own graphic images. Poster and CD-ROM products are available for both gravity anomaly and estimated seafloor topography of several regions. Please refer to URL https://www.ngdc.noaa.gov/mgg/fliers/92mgg04.html more information, and to download sample images.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 GCMD Data Center Keywords Global Change Master Directory (GCMD) Data Center Keywords
    2017-04-24
1 GCMD Location Keywords Global Change Master Directory (GCMD) Location Keywords
    2017-04-24
1 GCMD Project Keywords Global Change Master Directory (GCMD) Project Keywords
    2017-04-24
1 NASA/GCMD Science Keywords Global Change Master Directory (GCMD) Science Keywords
    2017-04-24
1 Gravity Field Atlas of the S. Ocean
    1994-01-01
1 Uncontrolled Keywords
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    CI_Series

    Count Component Name Issue Identification Page
    1 MGG-7 MGG-7, Gravity Field Atlas Over the Southern Ocean from GEOSAT
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    CI_ResponsibleParty

    Count Component Individual Organization Position Email Role Linkage
    4 GCMD Landing Page https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
    1 Anna Milan Anna Milan DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Metadata Specialist Anna.Milan@noaa.gov pointOfContact
    2 Brian Meyer Brian Meyer DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Brian.Meyer@noaa.gov pointOfContact
    2 NCEI (publisher) DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce publisher
    1 User Services (originator) DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services ngdc.info@noaa.gov originator
    1 User Services DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services ngdc.info@noaa.gov distributor
    1 Robin Warnken Robin Warnken DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Robin.R.Warnken@noaa.gov pointOfContact
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    CI_OnlineResource

    Count Component Linkage Name Description Function
    1 http://ols.nndc.noaa.gov/plolstore/plsql/olstore.prodspecific?prodnum=G01330-PUB-A0001
    4 https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information
    1 https://www.ngdc.noaa.gov/mgg/fliers/92mgg04.html
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    MD_Identifier or RS_Identifier

    Count Component Code
    1 radar altimeter
    1 satellite
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    EX_Extent

    Bounding Box Temporal Extent
    Count Component Description West East North South Start End
    1 -180.0 180.0 72.0 -72.0 1978-07-01 1978-10-30
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    EX_GeographicBoundingBox

    Count Component West East North South
    1 -180.0 180.0 72.0 -72.0
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    EX_TemporalExtent

    Count Component Start End
    1 1978-07-01 1978-10-30
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    MD_Format

    Count Component Name Version specification
    1 Publication
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    MD_Medium

    none found
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    MD_Constraints

    Count Component Use Limitation
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    MD_ReferenceSystem

    none found
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    MD_GridSpatialRepresentation

    none found
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    MD_Georeferenceable or MI_Georeferenceable

    none found
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    MD_Georectified or MI_Georectified

    none found
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    MD_Dimension

    none found
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    MD_CoverageDescription or MI_CoverageDescription

    none found
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    MD_Band or MI_Band

    none found
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    MI_RangeElementDescription

    none found
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    MD_AggregateInformation

    none found
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    LE_Source or LI_Source

    none found
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    LE_ProcessStep or LI_ProcessStep

    Count Component DateTime Description
    1 2015-04-22T00:00:00 NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
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    MI_Operation

    none found
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    MI_Platform

    Count Component Code Description
    1 satellite
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    MI_Instrument

    Count Component Code Type Description
    1 radar altimeter
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