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EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution)spatialRepresentationInforeferenceSystemInfo identificationInfo contentInfo distributionInfo dataQualityInfo metadataMaintenance |
| (MI_Metadata) fileIdentifier: gov.noaa.ngdc.mgg.geophysical_models:EMAG2 language: eng; USA characterSet: (MD_CharacterSetCode) utf8 hierarchyLevel: (MD_ScopeCode) dataset contact: (CI_ResponsibleParty) individualName: Brian Meyer organisationName: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce contactInfo: (CI_Contact) phone: (CI_Telephone) voice: 303-497-6125 address: (CI_Address) electronicMailAddress: Brian.Meyer@noaa.gov role: (CI_RoleCode) pointOfContact dateStamp: 2013-06-17 metadataStandardName: ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data metadataStandardVersion: ISO 19115-2:2009(E) return to top 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 return to top referenceSystemInfo: (MD_ReferenceSystem) referenceSystemIdentifier: (RS_Identifier) authority: (CI_Citation) title: World Geodetic System 1984 alternateTitle: WGS 84 date: (CI_Date) date: 2007-08-27 dateType: (CI_DateTypeCode) revision citedResponsibleParty: (CI_ResponsibleParty) organisationName: contactInfo: (CI_Contact) onlineResource: (CI_OnlineResource) linkage: http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4326 name: WGS 84 description: GML of World Geodetic System 1984 coordinate reference system. function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) resourceProvider citedResponsibleParty: (CI_ResponsibleParty) organisationName: European Petroleum Survey Group contactInfo: (CI_Contact) onlineResource: (CI_OnlineResource) linkage: http://www.epsg-registry.org/ name: European Petroleum Survey Group Geodetic Parameter Registry description: Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations. function: (CI_OnLineFunctionCode) search role: (CI_RoleCode) publisher code: urn:ogc:def:crs:EPSG::4326 return to top 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 citedResponsibleParty: (CI_ResponsibleParty) individualName: Stefan Maus organisationName: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce contactInfo: (CI_Contact) phone: (CI_Telephone) voice: 303-497-6522 address: (CI_Address) electronicMailAddress: Stefan.Maus@noaa.gov role: (CI_RoleCode) pointOfContact citedResponsibleParty: (CI_ResponsibleParty) organisationName: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce contactInfo: (CI_Contact) onlineResource: (CI_OnlineResource) linkage: http://www.geomag.org/models/emag2.html role: (CI_RoleCode) distributor presentationForm: (CI_PresentationFormCode) mapDigital abstract: A global Earth Magnetic Anomaly Grid (EMAG2) has been compiled from satellite, ship, and airborne magnetic measuremtents. EMAG2 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: (CI_ResponsibleParty) individualName: Stefan Maus organisationName: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce contactInfo: (CI_Contact) phone: (CI_Telephone) voice: 303-497-6522 address: (CI_Address) electronicMailAddress: Stefan.Maus@noaa.gov role: (CI_RoleCode) pointOfContact resourceMaintenance: (MD_MaintenanceInformation) maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded 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 type: (MD_KeywordTypeCode) theme thesaurusName: (CI_Citation) title: NASA/GCMD Science Keywords date: citedResponsibleParty: (CI_ResponsibleParty) organisationName: NASA positionName: GCMD User Support Office contactInfo: (CI_Contact) address: (CI_Address) electronicMailAddress: gcmduso@gcmd.gsfc.nasa.gov onlineResource: (CI_OnlineResource) linkage: http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso name: GCMD Feedback Form description: Have a Comment for the GCMD? function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) custodian citedResponsibleParty: (CI_ResponsibleParty) organisationName: contactInfo: (CI_Contact) onlineResource: (CI_OnlineResource) linkage: http://gcmd.nasa.gov/learn/keyword_list.html name: GCMD Keywords Page description: This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) custodian descriptiveKeywords: (MD_Keywords) keyword: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce type: (MD_KeywordTypeCode) dataCenter thesaurusName: (CI_Citation) title: NASA/GCMD Data Center Keywords date: citedResponsibleParty: (CI_ResponsibleParty) organisationName: NASA positionName: GCMD User Support Office contactInfo: (CI_Contact) address: (CI_Address) electronicMailAddress: gcmduso@gcmd.gsfc.nasa.gov onlineResource: (CI_OnlineResource) linkage: http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso name: GCMD Feedback Form description: Have a Comment for the GCMD? function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) custodian citedResponsibleParty: (CI_ResponsibleParty) organisationName: contactInfo: (CI_Contact) onlineResource: (CI_OnlineResource) linkage: http://gcmd.nasa.gov/learn/keyword_list.html name: GCMD Keywords Page description: This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) custodian descriptiveKeywords: (MD_Keywords) keyword: Geographic Region > Global type: (MD_KeywordTypeCode) place thesaurusName: (CI_Citation) title: NASA/GCMD Location Keywords date: citedResponsibleParty: (CI_ResponsibleParty) organisationName: NASA positionName: GCMD User Support Office contactInfo: (CI_Contact) address: (CI_Address) electronicMailAddress: gcmduso@gcmd.gsfc.nasa.gov onlineResource: (CI_OnlineResource) linkage: http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso name: GCMD Feedback Form description: Have a Comment for the GCMD? function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) custodian citedResponsibleParty: (CI_ResponsibleParty) organisationName: contactInfo: (CI_Contact) onlineResource: (CI_OnlineResource) linkage: http://gcmd.nasa.gov/learn/keyword_list.html name: GCMD Keywords Page description: This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. function: (CI_OnLineFunctionCode) information role: (CI_RoleCode) custodian 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_LegalConstraints) 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 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 return to top 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 return to top 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 distributor: (MD_Distributor) distributorContact: (CI_ResponsibleParty) individualName: Stefan Maus organisationName: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce contactInfo: (CI_Contact) phone: (CI_Telephone) voice: 303-497-6522 address: (CI_Address) electronicMailAddress: Stefan.Maus@noaa.gov role: (CI_RoleCode) pointOfContact distributionOrderProcess: (MD_StandardOrderProcess) fees: None transferOptions: (MD_DigitalTransferOptions) transferSize: Real: 160 onLine: (CI_OnlineResource) 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 function: (CI_OnLineFunctionCode) download transferOptions: (MD_DigitalTransferOptions) transferSize: Real: 160 onLine: (CI_OnlineResource) 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. function: (CI_OnLineFunctionCode) download transferOptions: (MD_DigitalTransferOptions) transferSize: Real: 145 onLine: (CI_OnlineResource) 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. function: (CI_OnLineFunctionCode) download transferOptions: (MD_DigitalTransferOptions) transferSize: 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. function: (CI_OnLineFunctionCode) download transferOptions: (MD_DigitalTransferOptions) transferSize: Real: .1 onLine: (CI_OnlineResource) linkage: http://geomag.org/models/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.org/models/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.org/models/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.org/models/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.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 return to top 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) onlineResource: (CI_OnlineResource) 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. return to top metadataMaintenance: (MD_MaintenanceInformation) maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) annually maintenanceNote: Last Review Date: 2013-06-17 |
