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EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
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        individualName:  Brian Meyer
        organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                electronicMailAddress:  Brian.Meyer@noaa.gov
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    dateStamp:  2014-05-29
    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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                title:  World Geodetic System 1984
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                    date:  2007-08-27
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        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)
                individualName:  NGDC Geomagnetic Modeling Team
                organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                        electronicMailAddress:  geomag.models@noaa.gov
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                individualName:  NGDC Geomagnetic Modeling Team
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        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.
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            individualName:  NGDC Geomagnetic Modeling Team
            organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                    linkage: http://www.ngdc.noaa.gov/geomag/
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        graphicOverview:  (MD_BrowseGraphic)
            fileName: http://geomag.org/models/EMAG2/Looking_NW_at_Spain.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
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            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:  (MD_Constraints)
            useLimitation:  Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.
        resourceConstraints:  (MD_Constraints)
            useLimitation:  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.
        resourceConstraints:  (MD_Constraints)
            useLimitation:  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.
        spatialRepresentationType:  (MD_SpatialRepresentationTypeCode) grid
        language:  eng; USA
        topicCategory:  (MD_TopicCategoryCode) geoscientificInformation
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                extent:
                  TimePeriod:
                    beginPosition:  1946-01-01
                    endPosition:  2008-12-01
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    contentInfo:  (MI_CoverageDescription)
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            descriptor:  Magnetic Anomaly
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            definition:  Representation of grid cell with no measurement value.
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              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.org/models/EMAG2/EMAG2_scale.png
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                organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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                        linkage: http://www.geomag.org/models/emag2.html
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              Real:  160
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                linkage: http://geomag.org/models/EMAG2/EMAG2_poster_V2.pdf
                name:  EMAG2 Full Resolution Map poster
                description:  PDF of Full Resolution Map of EMAG2 as a poster
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                linkage: http://geomag.org/models/EMAG2/EMAG2_poster_V2.jpg
                name:  EMAG2 Full Resolution Map poster
                description:  JPG of Full Resolution Map of EMAG2 as a poster.
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                linkage: http://geomag.org/models/EMAG2/EMAG2_image_V2.jpg
                name:  EMAG2 Full Resolution Map image
                description:  JPG of Full Resolution Map of EMAG2 as an image.
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        transferOptions:  (MD_DigitalTransferOptions)
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              Real:  10
            onLine:  (CI_OnlineResource)
                linkage: http://geomag.org/info/Smaus/Doc/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.
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                linkage: http://geomag.org/models/EMAG2/EMAG2.kmz
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                description:  Plugin for Google Earth. Requires installation of Google Earth.
                function:  (CI_OnLineFunctionCode) download
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              Real:  442
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                description:  EMAG2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid.
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              Real:  228
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                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.
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                linkage: http://geomag.org/models/EMAG2/EMAG2_V2.grd
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                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
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              Real:  132
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                linkage: http://geomag.org/models/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
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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"http://geomag.org/info/Smaus/Doc/emag2.pdf
                    softwareReference:  (CI_Citation)
                        title:  Generic Mapping Tools (GMT)
                        date:  (CI_Date)
                            date:  2008-05-15
                            dateType:  (CI_DateTypeCode) revision
                    documentation:  (CI_Citation)
                        title:  EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements
                        date:  (CI_Date)
                            date:  2009-08-07
                            dateType:  (CI_DateTypeCode) publication
                        citedResponsibleParty:  (CI_ResponsibleParty)
                            contactInfo:  (CI_Contact)
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                                    linkage: http://geomag.org/info/Smaus/Doc/emag2.pdf
                            role:  (CI_RoleCode) originator
                        ISSN:  1525-2027
                    algorithm:  (LE_Algorithm)
                        citation:  (CI_Citation)
                            title:  National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map
                            date:  (CI_Date)
                                date:  2007-06-29
                                dateType:  (CI_DateTypeCode) publication
                            citedResponsibleParty:  (CI_ResponsibleParty)
                                contactInfo:  (CI_Contact)
                                    onlineResource:  (CI_OnlineResource)
                                        linkage: http://geomag.org/info/Smaus/Doc/wdmam.pdf
                                role:
                        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.org/info/Smaus/Doc/emag2.pdf
                    softwareReference:  (CI_Citation)
                        title:  Generic Mapping Tools (GMT)
                        date:  (CI_Date)
                            date:  2008-05-15
                            dateType:  (CI_DateTypeCode) revision
                    algorithm:  (LE_Algorithm)
                        citation:  (CI_Citation)
                            title:  EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements
                            date:  (CI_Date)
                                date:  2009-08-07
                                dateType:  (CI_DateTypeCode) publication
                            citedResponsibleParty:  (CI_ResponsibleParty)
                                contactInfo:  (CI_Contact)
                                    onlineResource:  (CI_OnlineResource)
                                        linkage: http://geomag.org/info/Smaus/Doc/emag2.pdf
                                role:  (CI_RoleCode) originator
                            ISSN:  1525-2027
                        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.org/info/Smaus/Doc/emag2.pdf
                    softwareReference:  (CI_Citation)
                        title:  Generic Mapping Tools (GMT)
                        date:  (CI_Date)
                            date:  2008-05-15
                            dateType:  (CI_DateTypeCode) revision
                    algorithm:  (LE_Algorithm)
                        citation:  (CI_Citation)
                            title:  National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map
                            date:  (CI_Date)
                                date:  2007-06-29
                                dateType:  (CI_DateTypeCode) publication
                            citedResponsibleParty:  (CI_ResponsibleParty)
                                contactInfo:  (CI_Contact)
                                    onlineResource:  (CI_OnlineResource)
                                        linkage: http://geomag.org/info/Smaus/Doc/wdmam.pdf
                                role:
                        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.org/info/Smaus/Doc/emag2.pdf
                    softwareReference:  (CI_Citation)
                        title:  Generic Mapping Tools (GMT)
                        date:  (CI_Date)
                            date:  2008-05-15
                            dateType:  (CI_DateTypeCode) revision
                    algorithm:  (LE_Algorithm)
                        citation:  (CI_Citation)
                            title:  National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map
                            date:  (CI_Date)
                                date:  2007-06-29
                                dateType:  (CI_DateTypeCode) publication
                            citedResponsibleParty:  (CI_ResponsibleParty)
                                contactInfo:  (CI_Contact)
                                    onlineResource:  (CI_OnlineResource)
                                        linkage: http://geomag.org/info/Smaus/Doc/wdmam.pdf
                                role:
                        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.org/info/Smaus/Doc/emag2.pdf
                    softwareReference:  (CI_Citation)
                        title:  Generic Mapping Tools (GMT)
                        date:  (CI_Date)
                            date:  2008-05-15
                            dateType:  (CI_DateTypeCode) revision
                    algorithm:  (LE_Algorithm)
                        citation:  (CI_Citation)
                            title:  EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements
                            date:  (CI_Date)
                                date:  2009-08-07
                                dateType:  (CI_DateTypeCode) publication
                            citedResponsibleParty:  (CI_ResponsibleParty)
                                contactInfo:  (CI_Contact)
                                    onlineResource:  (CI_OnlineResource)
                                        linkage: http://geomag.org/info/Smaus/Doc/emag2.pdf
                                role:  (CI_RoleCode) originator
                            ISSN:  1525-2027
                        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: 2014-05-08