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Metadata Identifier: gov.noaa.ngdc.mgg.geophysics:G01471

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 Data for Southwestern Alaska #2 The gravity station data (1294 records) were compiled by the Alaska Geological Survey and the U.S. Geological Survey, Menlo Park, California. This data base was received in September 1986. Principal gravity parameters include Free-air Anomalies and Simple Bouguer Anomalies (no terrain correction applied) and altimeter elevations to compute the anomalies. The observed gravity values are referenced to the International Gravity Standardization Net 1971 (IGSN 71). The gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula. The data are randomly distributed within the boundaries of central Alaska.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 Entity and Attribute Information
    1 Getty Thesaurus of Geographic Names Getty Thesaurus of Geographic Names
    • 2011-04-11
    1 Gravity Data for Southwestern Alaska
    1 Gravity Data for Southwestern Alaska #2
    • 1999-01-01
    1 Mean Sea Level depth
    • 2012-08-10
    1 GCMD Data Center Keywords NASA/GCMD Data Center Keywords
      1 NASA/GCMD Science Keywords NASA/Global Change Master Directory (GCMD) Earth Science Keywords
      • 2007-04
      1 Uncontrolled Keywords
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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
        1 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 EPSG Registry European Petroleum Survey Group publisher http://www.epsg-registry.org/
        1 Getty Research Institute TGN@getty.edu custodian http://www.getty.edu/research/tools/vocabularies/tgn/index.html
        1 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 State of Alaska originator
        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
        1 Susan Mclean (processor) Susan McLean DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Susan.McLean@noaa.gov processor
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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
        1 http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso GCMD Feedback Form Have a Comment for the GCMD? information
        1 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.getty.edu/research/tools/vocabularies/tgn/index.html Getty Thesaurus of Geographic Names Online Page This page provides an interface to search the Getty Thesaurus of Geographic Names. information
        1 http://www.ngdc.noaa.gov/mgg/fliers/se-0703.html
        1 http://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablereg.html
        1 http://www.ngdc.noaa.gov/mgg/gravity/1999cd.html
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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 -157.986 -152.029 63.9983 60.8298
        1
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        EX_GeographicBoundingBox

        Count Component West East North South
        1 -157.986 -152.029 63.9983 60.8298
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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
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        MD_ReferenceSystem

        Count Component Code Authority Title
        1 MSL urn:ogc:def:crs:EPSG::5715 Mean Sea Level depth
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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 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 density_1 Bouguer slab density value used to calculate the Bouguer correction, unique to Alaskan gravity data sets Holitna1 and Holitna2.
        1 density_2 Bouguer slab density value used to calculate the Bouguer correction, unique to Alaskan gravity data sets Holitna1 and Holitna2.
        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 0 mgals has been removed from the obs_grav values and that they are referenced to the IGSN71 datum.
        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 Bouguer_anom_simp_dens1 A simple Bouguer anomaly, using a Bouguer slab density specified in field labeled { density_1, density_2 }, unique to Alaskan gravity data sets Holitna1 and Holitna2.
        1 Bouguer_anom_comp_dens1 A complete Bouguer anomaly, including terrain correction, using a Bouguer slab density specified in field labeled { density_1, density_2 }, unique to Alaskan gravity data sets Holitna1 and Holitna2.
        1 Bouguer_anom_simp_dens2 A simple Bouguer anomaly, using a Bouguer slab density specified in field labeled { density_1, density_2 }, unique to Alaskan gravity data sets Holitna1 and Holitna2.
        1 Bouguer_anom_comp_dens2 A complete Bouguer anomaly, including terrain correction, using a Bouguer slab density specified in field labeled { density_1 , density_2 }, unique to Alaskan gravity data sets Holitna1 and Holitna2.
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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 Gravity Data for Southwestern Alaska Source Contribution: Gravity survey data Source Type: varies
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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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