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EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
 (MI_Metadata)
    fileIdentifier:  gov.noaa.ngdc.mgg.geophysical_models:EMAG2
    language:  eng; USA
    characterSet:  (MD_CharacterSetCode) utf8
    hierarchyLevel:  (MD_ScopeCode) dataset
    contact:  Brian Meyer
    dateStamp:  2015-08-31
    metadataStandardName:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
    metadataStandardVersion:  ISO 19115-2:2009(E)
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    spatialRepresentationInfo:  (MD_GridSpatialRepresentation)
        numberOfDimensions:  2
        axisDimensionProperties:  (MD_Dimension)
            dimensionName:  (MD_DimensionNameTypeCode) row
            dimensionSize:  10801
            resolution:
              Distance:  .033
        axisDimensionProperties:  (MD_Dimension)
            dimensionName:  (MD_DimensionNameTypeCode) column
            dimensionSize:  5401
            resolution:
              Distance:  .033
        cellGeometry:  (MD_CellGeometryCode) area
        transformationParameterAvailability:  true
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    referenceSystemInfo:  WGS84
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    identificationInfo:  (MD_DataIdentification)
        citation:  (CI_Citation)
            title:  EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
            date:  (CI_Date)
                date:  2009-08-07
                dateType:  (CI_DateTypeCode) publication
            edition:  Version 2
            editionDate:  2009-08-07
            identifier:  (MD_Identifier)
                code:
                  Anchor:  DOI doi:10.7289/V5MW2F2P
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
                role:  (CI_RoleCode) publisher
            citedResponsibleParty:  Geomagnetic Modeling Team
            citedResponsibleParty:  NGDC Geomagnetic Modeling Team (originator) (CI_ResponsibleParty)
                role:  (CI_RoleCode) originator
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
                contactInfo:  (CI_Contact)
                    onlineResource:  (CI_OnlineResource)
                        linkage: http://geomag.colorado.edu/emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html
                role:  (CI_RoleCode) distributor
            presentationForm:  (CI_PresentationFormCode) mapDigital
        abstract:  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.
        purpose:  Magnetic anomaly maps provide insight into the subsurface structure and composition of the Earth's crust. Over continental areas, magnetic anomalies illuminate geologic, tectonic, and geothermal evolution of crust and lithosphere. In the world's oceans, anomalies trending parallel to the isochrons (lines of equal age) reveal the temporal evolution of oceanic crust. Magnetic maps are widely used in the geological sciences and in resource exploration.
        status:  (MD_ProgressCode) completed
        pointOfContact:  Geomagnetic Modeling Team
        resourceMaintenance:  (MD_MaintenanceInformation)
            maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) asNeeded
        graphicOverview:  (MD_BrowseGraphic)
            fileName: http://geomag.colorado.edu/images/Looking_NW_at_Spain_s.jpg
            fileDescription:  EMAG2 looking north-west at Portugal/Spain from the Atlantic. Kursk (Russia) is seen as a strong anomaly in the background. The stripes on the left of the image are magnetic lineations due to sea-floor spreading.
            fileType:  jpg
        descriptiveKeywords:  (MD_Keywords)
            keyword:  EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Field
            keyword:  EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Intensity
            keyword:  EARTH SCIENCE > Solid Earth > Geomagnetism > Magnetic Anomalies
            type:  (MD_KeywordTypeCode) theme
            thesaurusName:  NASA/GCMD Keywords
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Geographic Region > Global
            type:  (MD_KeywordTypeCode) place
            thesaurusName:  GCMD Location Keywords
        descriptiveKeywords:  Data Center Keywords
        resourceConstraints:  (MD_Constraints)
            useLimitation:  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]
        resourceConstraints:  NGDC copyright
        resourceConstraints:  Navigation
        resourceConstraints:  NOAA Liability
        spatialRepresentationType:  (MD_SpatialRepresentationTypeCode) grid
        language:  eng; USA
        topicCategory:  (MD_TopicCategoryCode) geoscientificInformation
        extent:  (EX_Extent)
            geographicElement:  (EX_GeographicBoundingBox)
                westBoundLongitude:  -180
                eastBoundLongitude:  180
                southBoundLatitude:  -90
                northBoundLatitude:  90
            temporalElement:  (EX_TemporalExtent)
                extent:
                  TimePeriod:
                    beginPosition:  1946-01-01
                    endPosition:  2008-12-01
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    contentInfo:  (MI_CoverageDescription)
        attributeDescription:
          RecordType:  Grid Cell
        contentType:  (MD_CoverageContentTypeCode) modelResult
        dimension:  (MD_Band)
            descriptor:  Magnetic Anomaly
            maxValue:
              Real:  8165
            minValue:
              Real:  -3357
            units:
              BaseUnit:
                identifier:  nanoTesla
                unitsSystem:
        rangeElementDescription:  (MI_RangeElementDescription)
            name:  Empty Grid Cell
            definition:  Representation of grid cell with no measurement value.
            rangeElement:
              Record:  -99999
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    distributionInfo:  (MD_Distribution)
        distributionFormat:  (MD_Format)
            name:  Full Resolution Map
            version:  Version 2
            specification:  PDF of EMAG2 as a poster
        distributionFormat:  (MD_Format)
            name:  Full Resolution Map
            version:  Version 2
            specification:  JPG of EMAG2 as a poster
        distributionFormat:  (MD_Format)
            name:  Full Resolution Map
            version:  Version 2
            specification:  JPG of EMAG2 as an image
        distributionFormat:  (MD_Format)
            name:  Article
            version:  Version 2
            specification:  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.
        distributionFormat:  (MD_Format)
            name:  Google Earth
            version:  Version 2
            specification:  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]
        distributionFormat:  (MD_Format)
            name:  XYZ/Zip
            version:  Version 2
            specification:  ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.
        distributionFormat:  (MD_Format)
            name:  GIS TIFF
            version:  Version 2
            specification:  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.
        distributionFormat:  (MD_Format)
            name:  GMT Grid
            version:  Version 2
            specification:  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.
        distributionFormat:  (MD_Format)
            name:  Color-relief
            version:  Version 2
            specification:  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
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
                contactInfo:  (CI_Contact)
                    onlineResource:  (CI_OnlineResource)
                        linkage: http://geomag.colorado.edu/emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html
                role:  (CI_RoleCode) distributor
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  160
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2_poster_V2.pdf
                name:  EMAG2 Full Resolution Map poster
                description:  PDF of Full Resolution Map of EMAG2 as a poster
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  160
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2_poster_V2.jpg
                name:  EMAG2 Full Resolution Map poster
                description:  JPG of Full Resolution Map of EMAG2 as a poster.
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  145
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2_image_V2.jpg
                name:  EMAG2 Full Resolution Map image
                description:  JPG of Full Resolution Map of EMAG2 as an image.
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  10
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/emag2.pdf
                name:  EMAG2: A 2-arc-minute resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne and marine magnetic measurements
                description:  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.
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  .1
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2.kmz
                name:  Google Earth
                description:  Plugin for Google Earth. Requires installation of Google Earth.
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  442
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.xyz.gz
                name:  XYZ/Zip
                description:  EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  228
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.tif
                name:  GIS TIFF
                description:  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.
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  228
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2_V2.grd
                name:  GMT Grid
                description:  A GMT (Generic Mapping Tools) compatible netCDF grid with resolution of 2-arc-minutes. The values (nT) are stored as 32-bit floating point.
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  132
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2_image_V2.tif
                name:  Color-relief
                description:  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.
                function:  (CI_OnLineFunctionCode) download
        transferOptions:  (MD_DigitalTransferOptions)
            transferSize:
              Real:  225
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.colorado.edu/images/EMAG2/EMAG2_no_directional_gridding_2009-01-06.xyz.gz
                name:  XYZ/zip
                description:  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.
                function:  (CI_OnLineFunctionCode) download
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    dataQualityInfo:  NCEI repository history
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) model
        lineage:  (LI_Lineage)
            processStep:  (LE_ProcessStep)
                description:  Merged grids at 4 km altitude above geoid using Least Squares Collocation.
                processingInformation:  (LE_Processing)
                    identifier:  (MD_Identifier)
                        code:  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
                    softwareReference:  Generic Mapping Tools (GMT)
                    documentation:  EMAG2
                    algorithm:  (LE_Algorithm)
                        citation:  WDMAM
                        description:  Least Squares Collocation (LSC)
            processStep:  (LE_ProcessStep)
                description:  From all original ship and airborne measurements: subtracted main and external fields given by the Comprehensive Model (Sabaka et al., 2004)
                processingInformation:  (LE_Processing)
                    identifier:  (MD_Identifier)
                        code:  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
                    softwareReference:  Generic Mapping Tools (GMT)
                    algorithm:  (LE_Algorithm)
                        citation:  EMAG2
                        description:  Main and external field subtraction from observations
            processStep:  (LE_ProcessStep)
                description:  Line-leveled the trackline data, minimizing misfits from neighboring and cross-over tracks.
                processingInformation:  (LE_Processing)
                    identifier:  (MD_Identifier)
                        code:  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
                    softwareReference:  Generic Mapping Tools (GMT)
                    algorithm:  (LE_Algorithm)
                        citation:  WDMAM
                        description:  Line-leveled the trackline data, reducing cross-over errors from 92 nT to 70 nT rms and the misfit to the merged grid from 121 nT to 97 nT rms.
            processStep:  (LE_ProcessStep)
                description:  Merged the trackline data with the grid at 4 km altitude using Least Squares Collocation with anisotropic correlation function (directional gridding).
                processingInformation:  (LE_Processing)
                    identifier:  (MD_Identifier)
                        code:  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
                    softwareReference:  Generic Mapping Tools (GMT)
                    algorithm:  (LE_Algorithm)
                        citation:  WDMAM
                        description:  Least Squares Collocation (LSC)
            processStep:  (LE_ProcessStep)
                description:  Substituted spherical harmonic degrees less than or equal to 120 (33 km wavelength) with CHAMP satellite magnetic anomaly model MF6 (Maus et al., 2008).
                processingInformation:  (LE_Processing)
                    identifier:  (MD_Identifier)
                        code:  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
                    softwareReference:  Generic Mapping Tools (GMT)
                    algorithm:  (LE_Algorithm)
                        citation:  EMAG2
                        description:  Input data from the CHAMP satellite magnetic anomaly model MF6.
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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) annually
        maintenanceNote:  Last Review Date: 2015-09-18
        maintenanceNote:  This record has been automatically modified to include references to NCEI where applicable on 2015-08-31.
        contact:  Anna Milan