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Metadata Identifier: gov.noaa.ngdc.mgg.geophysics:G01475

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 The Maryland/Virginia Area The gravity station data (5,905 records) were compiled by the U. S. Geological Survey. This data base was received on July 11, 1997. Principal gravity parameters include observed gravity, Free-air anomalies and Bouguer anomalies. The Bouguer gravity anomaly values were computed using the 1967 gravity formula (International Association of Geodesy, 1971). See Open-File Report 90-265 for further information.
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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
    2 Gravity Data For The Maryland/Virginia Area
    • 1999-01-01
    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
        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
          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 DOI/USGS DOI/USGS>U.S. Geological Survey, U.S. Department of the Interior originator http://www.usgs.gov/ask/index.php
          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
          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
          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/1999/document/html/tablereg.html
          1 http://www.ngdc.noaa.gov/mgg/gravity/1999cd.html
          1 http://www.usgs.gov/ask/index.php
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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 -79.4793 -75.7073 39.9992 38.0388
          1
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          EX_GeographicBoundingBox

          Count Component West East North South
          1 -79.4793 -75.7073 39.9992 38.0388
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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_min The minute portion of the longitude when the longitude is given in degrees, minutes, and seconds. Values range from 0 to less than 60.
          1 sea_level_elev_ft Height of the surface of observation above sea level, in feetNOTE: 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.
          1 terr_corr 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 at the point of observation. As a consequence, the terrain correction is always added to the simple Bouguer correction.
          1 curvature_corr The Bouguer gravity correction assumes that the mass between the measurement elevation and sea level can be approximated by an infinite slab (often using a slab density of 2.67 grams per cc). The curvature correction is subtracted from the Bouguer gravity correction and compensates for the mass of this slab which extends beyond the curvature of the Earth. The U.S. Geological Survey computes it as follows: curvature_corr = elev*(1.4639108e-3+elev*(4.449648e-14*elev-3.532715e-7))Where elev is the elevation of the gravity station in meters and the curvature correction is in units of milligals. This correction rarely exceeds a few tenths of a milligal and is often omitted.
          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).
          1 Bouguer_anom The residual value obtained after latitude correction, elevation correction (including both free-air and Bouguer corrections) and terrain corrections have been applied to gravity data. In many situations the terrain correction is assumed to be zero. When this is explicitly documented, the term " Simple Bouguer Anomaly " is often used. When one explicitly documents that the terrain correction has been applied the term " Complete Bouguer Anomaly " is often used.
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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 The Maryland/Virginia Area 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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