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Metadata Identifier: gov.noaa.ngdc.mgg.geophysics:G01479

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 NGS Gravity Station Data for the U.S. The gravity station data (1,633,499 records) were gathered by various governmental organizations (and academia) using a variety of methods. This data base was received in March 1999. Principal gravity parameters include Free-air Anomalies and Simple Bouguer Anomalies (with terrain correction applied only in areas where substantial variations in local topography exist). The gravity station data has been adjusted to the International Gravity Standardization Net 1971 (IGSN 71) and the gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula. The data are randomly distributed within the boundaries of the U.S., Alaska and Hawaii.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 Mean Sea Level depth
    2012-08-10
2 NGS Gravity Station Data for the U.S.
    1999-01-01
1 Uncontrolled Keywords
    Unresolved Xlinks
    NASA/GCMD Science Keywords at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[1]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]
    GCMD Location Keywords at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[4]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]
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    CI_Series

    none found
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    CI_ResponsibleParty

    Count Component Individual Organization Position Email Role Linkage
    1 resourceProvider http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::5715
    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
    Unresolved Xlinks
    EPSG Registry at: /gmi:MI_Metadata/gmd:referenceSystemInfo[1]/gmd:MD_ReferenceSystem[1]/gmd:referenceSystemIdentifier[1]/gmd:RS_Identifier[1]/gmd:authority[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
    Susan Mclean at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:pointOfContact[1]
    National Geodetic Survey at: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:source[1]/gmd:LI_Source[1]/gmd:sourceCitation[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[1]
    Anna Milan at: /gmi:MI_Metadata/gmd:metadataMaintenance[1]/gmd:MD_MaintenanceInformation[1]/gmd:contact[1]
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    CI_OnlineResource

    Count Component Linkage Name Description Function
    1 http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::5715 MSL depth GML for Vertical CRS in EPGS Registry. information
    1 http://www.ngdc.noaa.gov/mgg/fliers/se-0703.html
    1 http://www.ngdc.noaa.gov/mgg/gravity/
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    MD_Identifier or RS_Identifier

    Count Component Code
    1 urn:ogc:def:crs:EPSG::5715
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    EX_Extent

    Bounding Box Temporal Extent
    Count Component Description West East North South Start End
    1 -179.99882 -60.18833 79.99166 20.00000
    1
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    EX_GeographicBoundingBox

    Count Component West East North South
    1 -179.99882 -60.18833 79.99166 20.00000
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    EX_TemporalExtent

    Count Component Start End
    2
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    MD_Format

    Count Component Name Version specification
    1 Binary
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    MD_Medium

    Count Component Name mediumFormat mediumNote
    1 cdRom iso9660 iso9660
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    MD_Constraints

    Count Component Use Limitation
    Unresolved Xlinks
    NOAA Disclaimer at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:resourceConstraints[1]
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    MD_ReferenceSystem

    Count Component Code Authority Title
    1 MSL urn:ogc:def:crs:EPSG::5715 Mean Sea Level depth
    EPSG Registry at Xpath: /gmi:MI_Metadata/gmd:referenceSystemInfo[1]/gmd:MD_ReferenceSystem[1]/gmd:referenceSystemIdentifier[1]/gmd:RS_Identifier[1]/gmd:authority[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
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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

    Count Component Attribute Description Content Type
    1
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    MD_Band or MI_Band

    Count Component Identifier Descriptor
    1 agency_code A numeric code identifying the contributing source of a dataset.
    1 Bouguer_anom_267 A Bouguer anomaly calculated using a Bouguer slab density of 2.67g/cc.Note that the gravity anomaly calculations were computed using the GRS67 model.
    1 Bouguer_anom_sd The standard deviation associated with the Bouguer Anomaly.
    1 edit_code A National Geodetic Survey code used to summarize record editing actions.
    1 latitude This is the geographic latitude expressed as a decimal number. The units are degrees. The range is -90.0 to +90.0.
    1 longitude This is the geographic longitude expressed as a decimal number. The units are degrees. The range is -180.0 to +180.0, where plus designates East longitude and minus designates West longitude.
    1 sea_level_elev_m Height of the surface of observation above sea level, in meters (NOTE: most often from terrain surface but may be from lake surface).
    1 obs_grav The observed, or measured value of gravity in mGals at an occupied gravity station. In general, observed gravity varies from 978,000 to 984,200 mgals; therefore, many data contributors subtract a large constant from 900,000 to 982,000 from this field.Note that a constant of 978,000 mgals has been removed from the obs_grav values and that they are referenced to the IGSN71 datum.
    1 secondary_dist_m The secondary_dist_ft variable converted to meters. From DMA.
    1 obs_grav_sd The standard deviation associated with the observed gravity value.
    1 Free_air_anom The anomalous gravity difference between an observed value and theoretical value. The gravity data has been corrected for latitude and elevation (free-air correction), but not for the density of the rock between datum and the plane of measurement (Bouguer correction).Note that the gravity anomaly calculations were computed using the GRS67 model.
    1 Free_air_anom_sd The standard deviation of the Free-air Anomaly.
    1 terr_corr_total The terrain correction is an adjustment to the simple Bouguer correction that accounts for variations in terrain above and below the elevation of the gravity station at distances away from the point of measurement. Terrain below and above the level of the theoretical horizontal slab used to make the simple Bouguer correction results in a mass deficiency or excess that always yields an erroneously low gravity measurement. As a consequence, the terrain correction is always added to the simple Bouguer correction. The total terrain correction is the sum of the inner and outer zone terrain corrections described above.
    1 terr_corr_sd The standard deviation associated with the terrain correction.
    1 source_id A numeric code for the contributing author or organizations of the data.
    1 station_char_code An alphanumeric code which indicates the type of elevation used in reducing the measured gravity to anomaly values. Generally, elevation of land gravity station, if ocean measurement, then ocean depth positive downward from surface. In some situations this may represent instrument or bottom depth, ice thickness or alternative sea-level distance measurement. From DMA.
    1 proprietary_code A numeric code denoting whether a gravity data record is: 1)not proprietary data (unmonumented) code=1, or 2)not proprietary data (monumented) code=3Unique to the NGS93 data set.
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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

    Count Component Title Date Description
    1 NGS Gravity Station Data for the U.S. Source Contribution: Gravity survey data Source Type: varies
    National Geodetic Survey at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:source[1]/gmd:LI_Source[1]/gmd:sourceCitation[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[1]
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    LE_ProcessStep or LI_ProcessStep

    Count Component DateTime Description
    1 All data was processed by the source before being forwarded to the National Geophysical Data Center
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    MI_Operation

    none found
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    MI_Platform

    none found
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    MI_Instrument

    none found
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