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Metadata Identifier: gov.noaa.ngdc.mgg.geophysics:G01149

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 Aeromagnetic Regional Grid Data Several regions are represented in this unique collection of earth surface measurements of magnetic field parameters and their related anomalies. The DNAG Magnetics "Super grid" of Magnetic Anomaly Map of North America was created from the four "Original" DNAG Magnetic data sets distributed by The Committee for the Magnetic Anomaly Map of North America, 1987. This development of a super grid involved an extensive task of matching original quadrant information and eliminating overlap. The resulting grid, with x and y step intervals of 2.0 kilometers yields a grid with dimensions (4451 x 4273) containing 19,019,123 values. This process can be thought of as "stitching the grids." The data in this grid are in a Spherical Transverse Mercator projection, the kilometer coordinates of which can be recovered from the indices of a grid point. The Ministry of Geology of the USSR published a mosaic series of 18 maps in 1974, at a scale of 1:2,500,000 showing the residual magnetic intensity over the land mass of the USSR. Much of the source material originated from data collected between 1949-1962, during which time the entire territory of the USSR was surveyed using aerial magnetic survey techniques. These surveys wereadjusted based on many methods including secular variation linked to magnetic observatories. Anomalies were computed with reference to a normal field map for 1964-65 constructed from equally accurate total field measurements along control network strips. Digitization was accomplished in 1982 by the U.S. Naval Oceanographic Office. The "BRIGGS cubic spline" method was used to compute grid values. A one-minute grid was created by properly matching the boundaries of the digitized sub-sections. The units of the original map aremilli-Oersteds and the units of the resulting digital grid are milli-Oersted/100. Corrections to the digital contour file were made by Conoco Inc.in 1993. New Grid files at 2.5 Km and 5.0 Km spacing were created and re-archived by NGDC. These data are available on CD-ROM. World Data Center-A (WDC-A) for Solid Earth Geophysics presently holds Grid data from many U.S. and other regions. These data were contributed by: USGS, MINN G.S. and other Worldwide organizations. Grid intervals vary but are as fine as 213.36m for the NGS Super Grid of the state of Minnesota. Other grids were recreated indigital form from previously published maps and charts. The bulk of these grid data files were contributed to NGDC after 1985. A detailed list of the specific regions is available upon request.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 Aeromagnetic Regional Grid Data
  • 1983-01-01
1 GCMD Keyword Thesaurus
    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

      Count Component Name Issue Identification Page
      1 Solid Earth (SE) Magnetic Anomaly Data of the Former Soviet Union, 1996. SE-44, Directory of Data Sources for Lithospheric Investigations.
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      CI_ResponsibleParty

      Count Component Individual Organization Position Email Role Linkage
      3 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 Geological Survey of Canada originator
      1 Minnesota Geological Survey originator
      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 The Committee for the Magnetic Anomaly Map of North America (1987) originator
      1 The Ministry of Geology of the USSR originator
      1 U.S. Department of Energy originator
      1 U.S. Naval Oceanographic Office originator
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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://www.ngdc.noaa.gov/seg/potfld/amag_grd.shtml
      1 http://www.ngdc.noaa.gov/seg/potfld/aromag.html
      1 http://www.usgs.gov/ask/index.php
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      MD_Identifier or RS_Identifier

      Count Component Code
      1 AIRCRAFT
      1 MAGNETOMETER
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      EX_Extent

      Bounding Box Temporal Extent
      Count Component Description West East North South Start End
      1 -180 180 90 -90 1978-01-01 1990-01-01
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      EX_GeographicBoundingBox

      Count Component West East North South
      1 -180 180 90 -90
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      EX_TemporalExtent

      Count Component Start End
      1 1978-01-01 1990-01-01
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      MD_Format

      Count Component Name Version specification
      1 ASCII
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      MD_Medium

      Count Component Name mediumFormat mediumNote
      1 cdRom iso9660
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      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.
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      MD_ReferenceSystem

      none found
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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

      none found
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      MD_Band or MI_Band

      none found
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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

      none found
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      LE_ProcessStep or LI_ProcessStep

      none found
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      MI_Operation

      none found
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      MI_Platform

      Count Component Code Description
      1 AIRCRAFT
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      MI_Instrument

      Count Component Code Type Description
      1 MAGNETOMETER
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