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Metadata Identifier: gov.noaa.ngdc.mgg.geophysics:G01332

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 Southern Ocean Predicted Seafloor Topography Poster - MGG9 This 36 by 48 inch full color poster is MGG Report 9. 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 http://www.ngdc.noaa.gov/mgg/fliers/94mgg04.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 NASA/GCMD Data Center Keywords
    1 GCMD Location Keywords NASA/GCMD Location Keywords
      1 NASA/GCMD Science Keywords NASA/Global Change Master Directory (GCMD) Earth Science Keywords
      • 2007-04
      1 Southern Ocean Predicted Seafloor Topography Poster - MGG9
      • 1994-01-01
      1 Uncontrolled Keywords
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        CI_Series

        Count Component Name Issue Identification Page
        1 MGG-9 MGG9, Predicted Seafloor Topography for the Southern Ocean from GEOSAT Poster
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        CI_ResponsibleParty

        Count Component Individual Organization Position Email Role Linkage
        2 GCMD Valids custodian http://gcmd.nasa.gov/learn/keyword_list.html
        2 Brian Meyer Brian Meyer DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Brian.Meyer@noaa.gov pointOfContact
        1 User Services (publisher) DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center User Services ngdc.info@noaa.gov publisher
        1 User Services (originator) DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center User Services ngdc.info@noaa.gov originator
        1 User Services DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center User Services ngdc.info@noaa.gov distributor
        2 GCMD User Support Office NASA GCMD User Support Office gcmduso@gcmd.gsfc.nasa.gov custodian http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
        1 NASA/GSFC/SED/ESD/GCDC/GCMD > Global Change Master Directory, Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA resourceProvider http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html
        1 Robin Warnken Robin Warnken DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, 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://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html GCMD Keywords, Version 6.0.0.0.0 Thesuarus for earth science keywords and associated directories hosted and maintained by NASA. information
        2 http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso GCMD Feedback Form Have a Comment for the GCMD? information
        2 GCMD Keyword Page http://gcmd.nasa.gov/learn/keyword_list.html GCMD Keywords Page This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. information
        1 http://www.ngdc.noaa.gov/mgg/fliers/94mgg04.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 -180.000000 180.000000 72.000000 -72.000000 1978-07-01 1978-10-30
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        EX_GeographicBoundingBox

        Count Component West East North South
        1 -180.000000 180.000000 72.000000 -72.000000
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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 Poster MGG-9
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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

        none found
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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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