Metadata Identifier: gov.noaa.ngdc.mgg.geophysics:G01329

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 Over the S.Ocean - Poster, MGG-6 This is a full color 24 by 36 inch poster. 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/announcements/announce_predict.html for more information, and to download sample images.
Top

SV_Identification

none found
Top

CI_Citation

Count Component Title Date Citation Identifier
1 GCMD Data Center Keywords Global Change Master Directory (GCMD) Data Center Keywords
    2020-01-09
1 GCMD Location Keywords Global Change Master Directory (GCMD) Location Keywords
    2020-01-09
1 GCMD Project Keywords Global Change Master Directory (GCMD) Project Keywords
    2020-01-09
1 NASA/GCMD Science Keywords Global Change Master Directory (GCMD) Science Keywords
    2020-01-09
1 Gravity Field Over the S.Ocean - Poster, MGG-6
    1994-01-01
1 Uncontrolled Keywords
    Top

    CI_Series

    Count Component Name Issue Identification Page
    1 MGG-6 MGG-6, Gravity Field Over the Southern Ocean from GEOSAT Poster
    Top

    CI_ResponsibleParty

    Count Component Individual Organization Position Email Role Linkage
    2 Brian Meyer Brian Meyer NOAA National Centers for Environmental Information Brian.Meyer@noaa.gov pointOfContact
    1 User Services (publisher) DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce User Services ngdc.info@noaa.gov 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
    4 GCMD Landing Page NASA Goddard Space Flight Center, Earth Science Data and Information System custodian https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
    1 NCEI (publisher) NOAA National Centers for Environmental Information publisher
    1 Anna Milan NOAA National Centers for Environmental Information Metadata Specialist editor
    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
    Top

    CI_OnlineResource

    Count Component Linkage Name Description Function
    4 https://www.earthdata.nasa.gov/learn/find-data/idn/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/92mgg01.html
    Top

    MD_Identifier or RS_Identifier

    Count Component Code
    1 radar altimeter
    1 satellite
    Top

    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
    Top

    EX_GeographicBoundingBox

    Count Component West East North South
    1 -180.000000 180.000000 72.000000 -72.000000
    Top

    EX_TemporalExtent

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

    MD_Format

    Count Component Name Version specification
    1 Poster
    Top

    MD_Medium

    none found
    Top

    MD_Constraints

    Count Component Use Limitation
    Top

    MD_ReferenceSystem

    none found
    Top

    MD_GridSpatialRepresentation

    none found
    Top

    MD_Georeferenceable or MI_Georeferenceable

    none found
    Top

    MD_Georectified or MI_Georectified

    none found
    Top

    MD_Dimension

    none found
    Top

    MD_CoverageDescription or MI_CoverageDescription

    none found
    Top

    MD_Band or MI_Band

    none found
    Top

    MI_RangeElementDescription

    none found
    Top

    MD_AggregateInformation

    none found
    Top

    LE_Source or LI_Source

    none found
    Top

    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.
    Top

    MI_Operation

    none found
    Top

    MI_Platform

    Count Component Code Description
    1 satellite
    Top

    MI_Instrument

    Count Component Code Type Description
    1 radar altimeter
    Top