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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
1 EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
    2009-08-07
doi:10.7289/V5MW2F2P
1 GCMD Location Keywords NASA/GCMD Location Keywords
    2015-03-01
    1995-04-24
1 NASA/GCMD Keywords NASA/GCMD Science Keywords
    2015-03-01
    1995-04-24
1 World Geodetic System 1984
    2007-08-27
Unresolved Xlinks
Generic Mapping Tools (GMT) at: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[1]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
Generic Mapping Tools (GMT) at: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[2]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
Generic Mapping Tools (GMT) at: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[3]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
Generic Mapping Tools (GMT) at: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[4]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
Generic Mapping Tools (GMT) at: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[5]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
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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
1 NGDC Geomagnetic Modeling Team (originator) originator
2 DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce distributor http://geomag.colorado.edu/emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html
Unresolved Xlinks
Brian Meyer at: /gmi:MI_Metadata/gmd:contact[1]
EPSG Registry at: /gmi:MI_Metadata/gmd:referenceSystemInfo[1]/gmd:MD_ReferenceSystem[1]/gmd:referenceSystemIdentifier[1]/gmd:RS_Identifier[1]/gmd:authority[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
NCEI (publisher) at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:citation[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[1]
Geomagnetic Modeling Team at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:citation[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
NGDC Geomagnetic Modeling Team (originator) at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:citation[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[3]
Geomagnetic Modeling Team at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:pointOfContact[1]
GCMD User Support Office at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[1]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[1]
GCMD Valids at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[1]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
GCMD User Support Office at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[2]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[1]
GCMD Valids at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:descriptiveKeywords[2]/gmd:MD_Keywords[1]/gmd:thesaurusName[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
Anna Milan at: /gmi:MI_Metadata/gmd:metadataMaintenance[1]/gmd:MD_MaintenanceInformation[1]/gmd:contact[1]
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CI_OnlineResource

Count Component Linkage Name Description Function
2 http://geomag.colorado.edu/emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html
1 http://geomag.colorado.edu/images/EMAG2/EMAG2.kmz Google Earth Plugin for Google Earth. Requires installation of Google Earth. download
1 http://geomag.colorado.edu/images/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.colorado.edu/images/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.colorado.edu/images/EMAG2/EMAG2_V2.xyz.gz XYZ/Zip EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid. download
1 http://geomag.colorado.edu/images/EMAG2/EMAG2_image_V2.jpg EMAG2 Full Resolution Map image JPG of Full Resolution Map of EMAG2 as an image. download
1 http://geomag.colorado.edu/images/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.colorado.edu/images/EMAG2/EMAG2_no_directional_gridding_2009-01-06.xyz.gz XYZ/zip EMAG2 (Version 2.0) ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid. This version was produced without directional gridding. Therefore, it has much sparser coverage but reflects more closely the actual measurements. download
1 http://geomag.colorado.edu/images/EMAG2/EMAG2_poster_V2.jpg EMAG2 Full Resolution Map poster JPG of Full Resolution Map of EMAG2 as a poster. download
1 http://geomag.colorado.edu/images/EMAG2/EMAG2_poster_V2.pdf EMAG2 Full Resolution Map poster PDF of Full Resolution Map of EMAG2 as a poster download
1 http://geomag.colorado.edu/images/EMAG2/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
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
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MD_Identifier or RS_Identifier

Count Component Code
5 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.colorado.edu/images/EMAG2/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.colorado.edu/images/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.
Unresolved Xlinks
Navigation at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:resourceConstraints[3]
NOAA Liability at: /gmi:MI_Metadata/gmd:identificationInfo[1]/gmd:MD_DataIdentification[1]/gmd:resourceConstraints[4]
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MD_ReferenceSystem

Count Component Code Authority Title
1 WGS84 urn:ogc:def:crs:EPSG::4326 World Geodetic System 1984
EPSG Registry at Xpath: /gmi:MI_Metadata/gmd:referenceSystemInfo[1]/gmd:MD_ReferenceSystem[1]/gmd:referenceSystemIdentifier[1]/gmd:RS_Identifier[1]/gmd:authority[1]/gmd:CI_Citation[1]/gmd:citedResponsibleParty[2]
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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.
Generic Mapping Tools (GMT) at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[1]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
EMAG2 at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[1]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:documentation[1]
WDMAM at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[1]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:algorithm[1]/gmi:LE_Algorithm[1]/gmi:citation[1]
1 From all original ship and airborne measurements: subtracted main and external fields given by the Comprehensive Model (Sabaka et al., 2004)
Generic Mapping Tools (GMT) at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[2]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
EMAG2 at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[2]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:algorithm[1]/gmi:LE_Algorithm[1]/gmi:citation[1]
1 Line-leveled the trackline data, minimizing misfits from neighboring and cross-over tracks.
Generic Mapping Tools (GMT) at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[3]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
WDMAM at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[3]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:algorithm[1]/gmi:LE_Algorithm[1]/gmi:citation[1]
1 Merged the trackline data with the grid at 4 km altitude using Least Squares Collocation with anisotropic correlation function (directional gridding).
Generic Mapping Tools (GMT) at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[4]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
WDMAM at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[4]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:algorithm[1]/gmi:LE_Algorithm[1]/gmi:citation[1]
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).
Generic Mapping Tools (GMT) at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[5]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:softwareReference[1]
EMAG2 at Xpath: /gmi:MI_Metadata/gmd:dataQualityInfo[2]/gmd:DQ_DataQuality[1]/gmd:lineage[1]/gmd:LI_Lineage[1]/gmd:processStep[5]/gmi:LE_ProcessStep[1]/gmi:processingInformation[1]/gmi:LE_Processing[1]/gmi:algorithm[1]/gmi:LE_Algorithm[1]/gmi:citation[1]
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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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