ISO Table View View Metadata As: Get Data, FAQ, HTML, 19139 XML
Assess Metadata For: Completeness, DOI Readiness, CSW Readiness, Components

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.
Top

SV_Identification

none found
Top

CI_Citation

Count Component Title Date Citation Identifier
1 Mean Sea Level depth
  • 2012-08-10
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
      2 NGS Gravity Station Data for the U.S.
      • 1999-01-01
      1 Uncontrolled Keywords
        Top

        CI_Series

        none found
        Top

        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 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
        1 National Geodetic Survey DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of Commerce ngs.cors@noaa.gov custodian
        1 EPSG Registry European Petroleum Survey Group publisher http://www.epsg-registry.org/
        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 Susan Mclean Susan McLean DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Susan.McLean@noaa.gov pointOfContact
        Top

        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.epsg-registry.org/ European Petroleum Survey Group Geodetic Parameter Registry Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations. search
        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/
        Top

        MD_Identifier or RS_Identifier

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

        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
        Top

        EX_GeographicBoundingBox

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

        EX_TemporalExtent

        Count Component Start End
        2
        Top

        MD_Format

        Count Component Name Version specification
        1 Binary
        Top

        MD_Medium

        Count Component Name mediumFormat mediumNote
        1 cdRom iso9660 iso9660
        Top

        MD_Constraints

        Count Component Use Limitation
        1 NOAA 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.
        Top

        MD_ReferenceSystem

        Count Component Code Authority Title
        1 MSL urn:ogc:def:crs:EPSG::5715 Mean Sea Level depth
        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

        Count Component Attribute Description Content Type
        1
        Top

        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.
        Top

        MI_RangeElementDescription

        none found
        Top

        MD_AggregateInformation

        none found
        Top

        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
        Top

        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
        Top

        MI_Operation

        none found
        Top

        MI_Platform

        none found
        Top

        MI_Instrument

        none found
        Top