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Metadata Identifier: gov.noaa.ngdc.mgg.geophysical_models:EMAG2

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 EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution) EMAG2 is a global Earth Magnetic Anomaly Grid compiled from satellite, ship, and airborne magnetic measurements. It is a significant update of our previous candidate grid for the World Digital Magnetic Anomaly Map. The resolution has been improved from 3 arc-minutes to 2 arc-minutes, and the altitude has been reduced from 5 km to 4 km above the geoid. Additional grid and track line data have been included, both over land and the oceans. Wherever available, the original shipborne and airborne data were used instead of precompiled oceanic magnetic grids. Interpolation between sparse track lines in the oceans was improved by directional gridding and extrapolation, based on oceanic crustal age model. The longest wavelengths (>330 km) were replaced with the latests CHAMP satellite magnetic field model MF6.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
3 EMAG2 EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements
  • 2009-08-07
1 EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
  • 2009-08-07
doi:10.7289/V5MW2F2P
5 Generic Mapping Tools (GMT) Generic Mapping Tools (GMT)
  • 2008-05-15
1 GCMD Data Center Keywords NASA/GCMD Data Center Keywords
    1 GCMD Location Keywords NASA/GCMD Location Keywords
      1 NASA/GCMD Keywords NASA/GCMD Science Keywords
        3 WDMAM National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map
        • 2007-06-29
        1 World Geodetic System 1984
        • 2007-08-27
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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::4326
        3 GCMD Valids custodian http://gcmd.nasa.gov/learn/keyword_list.html
        3 originator http://geomag.org/info/Smaus/Doc/emag2.pdf
        3 http://geomag.org/info/Smaus/Doc/wdmam.pdf
        1 Brian Meyer Brian Meyer DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Brian.Meyer@noaa.gov pointOfContact
        2 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce distributor http://www.geomag.org/models/emag2.html
        1 EPSG Registry European Petroleum Survey Group publisher http://www.epsg-registry.org/
        3 GCMD User Support Office NASA GCMD User Support Office gcmduso@gcmd.gsfc.nasa.gov custodian http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
        2 Stefan Maus Stefan Maus DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Stefan.Maus@noaa.gov pointOfContact
        1 Stefan Maus Stefan Maus DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Stefan.Maus@noaa.gov originator
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        CI_OnlineResource

        Count Component Linkage Name Description Function
        3 http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso GCMD Feedback Form Have a Comment for the GCMD? information
        3 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
        4 http://geomag.org/info/Smaus/Doc/emag2.pdf EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements Preprint of manuscript "EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements", submitted for publication to Geochem. Geophys. Geosyst. download
        3 http://geomag.org/info/Smaus/Doc/wdmam.pdf
        1 http://geomag.org/models/EMAG2/EMAG2.kmz Google Earth Plugin for Google Earth. Requires installation of Google Earth. download
        1 http://geomag.org/models/EMAG2/EMAG2_V2.grd GMT Grid A GMT (Generic Mapping Tools) compatible netCDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point. download
        1 http://geomag.org/models/EMAG2/EMAG2_V2.tif GIS TIFF A georeferenced TIFF (GeoTIFF) with a resolution of 2-arc-minutes, which can be opened by ESRI ArcGIS or any other GIS application. The values (nT) are stored as 32-bit floating point. download
        1 http://geomag.org/models/EMAG2/EMAG2_V2.xyz.gz XYZ/Zip EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid. download
        1 http://geomag.org/models/EMAG2/EMAG2_image_V2.jpg EMAG2 Full Resolution Map image JPG of Full Resolution Map of EMAG2 as an image. download
        1 http://geomag.org/models/EMAG2/EMAG2_image_V2.tif Color-relief A 24-bit RGB georeferenced TIFF (GeoTIFF) color-relief visualization of the EMAG2 grid, which can be opened by ArcGIS or any other GIS application. download
        1 http://geomag.org/models/EMAG2/EMAG2_poster_V2.jpg EMAG2 Full Resolution Map poster JPG of Full Resolution Map of EMAG2 as a poster. download
        1 http://geomag.org/models/EMAG2/EMAG2_poster_V2.pdf EMAG2 Full Resolution Map poster PDF of Full Resolution Map of EMAG2 as a poster download
        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::4326 WGS 84 GML of World Geodetic System 1984 coordinate reference system. information
        2 http://www.geomag.org/models/emag2.html
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        MD_Identifier or RS_Identifier

        Count Component Code
        4 Processing steps were carried out collectively by the developers of the model. These developers are listed as authors of the associated paper "EMAG2: A 2-arc minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements" found at http://geomag.org/info/Smaus/Doc/emag2.pdf
        1 Processing steps were carried out collectively by the developers of the model. These developers are listed as authors of the associated paper "EMAG2: A 2-arc minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements"http://geomag.org/info/Smaus/Doc/emag2.pdf
        1 doi:10.7289/V5MW2F2P
        1 urn:ogc:def:crs:EPSG::4326
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        EX_Extent

        Bounding Box Temporal Extent
        Count Component Description West East North South Start End
        1 -180 180 90 -90 1946-01-01 2008-12-01
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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 1946-01-01 2008-12-01
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        MD_Format

        Count Component Name Version specification
        1 Article Version 2 Preprint of manuscript "EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements", submitted for publication to Geochem. Geophys. Geosyst.
        1 Color-relief Version 2 A 24-bit RGB georeferenced TIFF (GeoTIFF) color-relief visualization of the EMAG2 grid, which can be opened by ArcGIS or any other GIS application. The color scale legend is at http://geomag.org/models/EMAG2/EMAG2_scale.png
        3 Full Resolution Map Version 2 PDF of EMAG2 as a poster
        1 GIS TIFF Version 2 A georeferenced TIFF (GeoTIFF) with a resolution of 2 arc-minutes, which can be opened by ESRI ArcGIS or any other GIS application. The values (nT) are stored as 32-bit floating point.
        1 GMT Grid Version 2 A GMT (Generic Mapping Tools) compatible net CDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point.
        1 Google Earth Version 2 Plugin for Google Earth. Requires installation of Google Earth. See also https://productforums.google.com/forum/?fromgroups#!msg/gec-dynamic-data-layers/yYsaTFnIzYQ/RVwprs5WhPQJ[1-25]
        1 XYZ/Zip Version 2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.
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        MD_Medium

        none found
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        MD_Constraints

        Count Component Use Limitation
        1 Cite as: Stefan Maus (2009): EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution). National Geophysical Data Center, NOAA. Model. doi:10.7289/V5MW2F2P [access date]
        1 NGDC copyright Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.
        1 Navigation Not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For navigation, please refer to the NOS nautical chart series.
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        MD_ReferenceSystem

        Count Component Code Authority Title
        1 WGS84 urn:ogc:def:crs:EPSG::4326 World Geodetic System 1984
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        MD_GridSpatialRepresentation

        Count Component Number of Dimensions Cell Geometry Code
        1 2 area
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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

        Count Component Name Code Size
        1 row 10801
        1 column 5401
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        MD_CoverageDescription or MI_CoverageDescription

        Count Component Attribute Description Content Type
        1 Grid Cell
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        MD_Band or MI_Band

        Count Component Identifier Descriptor
        1 Magnetic Anomaly
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        MI_RangeElementDescription

        Count Component Name Definition
        1 Empty Grid Cell Representation of grid cell with no measurement value.
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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

        Count Component DateTime Description
        1 Merged grids at 4 km altitude above geoid using Least Squares Collocation.
        1 From all original ship and airborne measurements: subtracted main and external fields given by the Comprehensive Model (Sabaka et al., 2004)
        1 Line-leveled the trackline data, minimizing misfits from neighboring and cross-over tracks.
        1 Merged the trackline data with the grid at 4 km altitude using Least Squares Collocation with anisotropic correlation function (directional gridding).
        1 Substituted spherical harmonic degrees less than or equal to 120 (33 km wavelength) with CHAMP satellite magnetic anomaly model MF6 (Maus et al., 2008).
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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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