gov.noaa.ngdc.mgg.geophysical_models:EMAG2 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact 2020-05-14 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) 2 row 10801 .033 column 5401 .033 area true World Geodetic System 1984 WGS 84 2007-08-27 revision https://epsg.org/crs_4326/WGS-84.html WGS 84 GML of World Geodetic System 1984 coordinate reference system. information resourceProvider European Petroleum Survey Group https://epsg.org/home.html 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 publisher urn:ogc:def:crs:EPSG::4326 EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution) 2009-08-07 publication Version 2 2009-08-07 International DOI Foundation (IDF) doi:10.7289/V5MW2F2P NOAA National Centers for Environmental Information NCEI Metadata ID: gov.noaa.ngdc.mgg.geophysical_models:EMAG2 NOAA National Centers for Environmental Information publisher Maus, S. author mapDigital 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. 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. completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact NOAA National Centers for Environmental Information NCEI Geomagnetic Modeling Team geomag.models@noaa.gov pointOfContact asNeeded http://geomag.colorado.edu/images/Looking_NW_at_Spain_s.jpg 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. jpg Earth Science > Solid Earth > Geomagnetism > Magnetic Field Earth Science > Solid Earth > Geomagnetism > Magnetic Intensity Earth Science > Solid Earth > Geomagnetism > Magnetic Anomalies theme Global Change Master Directory (GCMD) Science Keywords 2024 revision 19 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Geographic Region > Global place Global Change Master Directory (GCMD) Location Keywords 2024 revision 19 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2020-01-09 publication 9.1 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian otherRestrictions Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States. 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. otherRestrictions Cite as: Maus, S.. 2009: EMAG2: Earth Magnetic Anomaly Grid (2-arc-minute resolution). Version 2. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V5MW2F2P. Accessed [date]. grid eng; USA geoscientificInformation -180 180 -90 90 1946-01-01 2008-12-01 Grid Cell modelResult Magnetic Anomaly 8165 -3357 nanoTesla Empty Grid Cell Representation of grid cell with no measurement value. -99999 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information distributor In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. PDF Version 2 Full Resolution Map of EMAG2 as a poster JPG Version 2 Full Resolution Map of EMAG2 as a poster JPG Version 2 Full Resolution Map of EMAG2 as an image 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. 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] XYZ/Zip Version 2 ASCII grid of the magnetic total intensity at 4km above WGS84 ellipsoid. 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. 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. GeoTIFF Version 2 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. The color scale legend is at http://geomag.colorado.edu/images/EMAG2_scale.png https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc.mgg.geophysical_models:EMAG2/html HTTPS Metadata Landing Page information http://geomag.colorado.edu/emag2-earth-magnetic-anomaly-grid-2-arc-minute-resolution.html HTTPS EMAG2 Home Page information 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 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 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 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 http://geomag.colorado.edu/images/EMAG2/EMAG2.kmz Google Earth Plugin for Google Earth. Requires installation of Google Earth. download 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 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 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 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 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 repository NOAA National Centers for Environmental Information NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015. 2015-04-22T00:00:00 model Merged grids at 4 km altitude above geoid using Least Squares Collocation. 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 Generic Mapping Tools (GMT) 2008-05-15 revision EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements 2009-08-07 publication http://geomag.org/info/Smaus/Doc/emag2.pdf originator 1525-2027 National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map 2007-06-29 publication http://geomag.org/info/Smaus/Doc/wdmam.pdf Least Squares Collocation (LSC) From all original ship and airborne measurements: subtracted main and external fields given by the Comprehensive Model (Sabaka et al., 2004) 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 Generic Mapping Tools (GMT) 2008-05-15 revision EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements 2009-08-07 publication http://geomag.org/info/Smaus/Doc/emag2.pdf originator 1525-2027 Main and external field subtraction from observations Line-leveled the trackline data, minimizing misfits from neighboring and cross-over tracks. 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 Generic Mapping Tools (GMT) 2008-05-15 revision National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map 2007-06-29 publication http://geomag.org/info/Smaus/Doc/wdmam.pdf 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. Merged the trackline data with the grid at 4 km altitude using Least Squares Collocation with anisotropic correlation function (directional gridding). 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 Generic Mapping Tools (GMT) 2008-05-15 revision National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map 2007-06-29 publication http://geomag.org/info/Smaus/Doc/wdmam.pdf Least Squares Collocation (LSC) Substituted spherical harmonic degrees less than or equal to 120 (33 km wavelength) with CHAMP satellite magnetic anomaly model MF6 (Maus et al., 2008). 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 Generic Mapping Tools (GMT) 2008-05-15 revision EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements 2009-08-07 publication http://geomag.org/info/Smaus/Doc/emag2.pdf originator 1525-2027 Input data from the CHAMP satellite magnetic anomaly model MF6. asNeeded Modified for compliance to NCEI Template v1.2.