CF387546-B217-43D3-8781-8BEF8250253B utf8 dataset Geophysik Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) geodatenmanagement@bgr.de http://www.bgr.bund.de pointOfContact 2025-02-12 INSPIRE Metadata Implementing Rules: Technical Guidelines based on EN ISO 19115 and EN ISO 19119 n/a EPSG:4326 Earth Magnetic Anomaly Grid 1:35,000,000 (2 arc-minute resolution) (EMAG2) Earth Magnetic Anomaly Grid 1:35,000,000 (2 arc-minute resolution) (EMAG2) EMAG2 2010-11-10 publication 1. Auflage B3CCFEA1-9E87-4593-B4AB-6D441AA752C1 Barckhausen, U. et al. author Maus, S. author A global Earth Magnetic Anomaly Grid (EMAG2) was compiled from satellite, ship and airborne magnetic measurements. (Maus et al., 2009) Over the continents and the Arctic we made use of exisiting magnetic anomaly grids, whereas original ship and airborne trackline data were processed over the rest of the oceans, wherever available. CHAMP satellite magnetic measurements provided the magnetic field at wavelengths above 330 km. The EMAG2 grid is available at http://geomag.org and http://ngdc.noaa.gov. Directional gridding Due to the sparsity of magnetic field measurements in the southern oceans, it is necessary to interpolate the magnetic field between tracklines. Our interpolation algorithm takes the direction of the magnetic lineations into account. Tje lineations are parallel to the isochrons, which are perpendicular to the gradient of the age of teh oceanic crust. We use the age grid of Müller et al. (2008). The magnetic field ad a given grid point is computet by Least Squares Collocation from the surrounding measurements. If the point is on land, we use an isotropic correlation function with Rc = 14 km correlation length. Over the oceans we use Rc = 56 km parallel to the isochrons and Rc = 14 km in the spreading direction. Measurements seperated from the grid point by an age discontinuity or a topographic feature are excluded from the collation. A global Earth Magnetic Anomaly Grid (EMAG2) was compiled from satellite, ship and airborne magnetic measurements. (Maus et al., 2009) Over the continents and the Arctic we made use of exisiting magnetic anomaly grids, whereas original ship and airborne trackline data were processed over the rest of the oceans, wherever available. CHAMP satellite magnetic measurements provided the magnetic field at wavelengths above 330 km. The EMAG2 grid is available at http://geomag.org and http://ngdc.noaa.gov. Directional gridding Due to the sparsity of magnetic field measurements in the southern oceans, it is necessary to interpolate the magnetic field between tracklines. Our interpolation algorithm takes the direction of the magnetic lineations into account. Tje lineations are parallel to the isochrons, which are perpendicular to the gradient of the age of teh oceanic crust. We use the age grid of Müller et al. (2008). The magnetic field ad a given grid point is computet by Least Squares Collocation from the surrounding measurements. If the point is on land, we use an isotropic correlation function with Rc = 14 km correlation length. Over the oceans we use Rc = 56 km parallel to the isochrons and Rc = 14 km in the spreading direction. Measurements seperated from the grid point by an age discontinuity or a topographic feature are excluded from the collation. completed Barckhausen, Udo, Dr. Bundesanstalt für Geowissenschaften und Rohstoffe Stilleweg 2 Hannover 30655 DE Udo.Barckhausen@bgr.de pointOfContact https://download.bgr.de/bgr/Geophysik/EMAG2/Beispielbild/emag2.jpg Geologie GEMET - INSPIRE themes, version 1.0 2008-06-01 publication geophysics Geophysik GEMET - Concepts, version 2.4 2010-01-13 publication Earth magnetic field Erdmagnetfeld Weltkarte world map Weltweit Es gelten keine Zugriffsbeschränkungen Allgemeine Geschäftsbedingungen, s. https://www.bgr.bund.de/agb - General Terms and Conditions, s. https://www.bgr.bund.de/agb_en Preis der gedruckten Karte: 13,83 EUR (zzgl. 7% MWSt. und Versandkosten) Weitere Informationen zur Bestellung beim Internationalen Landkartenhaus siehe https://www.bgr.bund.de/produktcenter-bestellhinweis-ILH 35000000 eng utf8 geoscientificInformation true -180.00 180.00 -90.00 90.00 PDF n/a JPEG n/a TIFF n/a gedruckt n/a 2 https://download.bgr.de/bgr/Geophysik/EMAG2/pdf/emag2.zip EMAG2 (PDF) EMAG2 im Format Adobe Acrobat Datei (geringe Auflösung) download 12 https://download.bgr.de/bgr/Geophysik/EMAG2/jpg/emag2.zip EMAG2 (JPEG) EMAG2 im Format JPEG (Auflösung 150 dpi) download 68 https://download.bgr.de/bgr/Geophysik/EMAG2/tiff/emag2.zip EMAG2 (TIFF) EMAG2 im Format TIFF (Auflösung 300 dpi) download https://www.bgr.bund.de/produktcenter-bestellhinweis-ILH EMAG2 (gedruckt) EMAG2 im Format gedruckt, gefalzt information http://geomag.org/models/emag2.html EMAG2-Projekt im Internet - EMAG2-Project-Website information Daten: NOAA, Boulder, CO, USA. Referenz: Maus, S., U. Barckhausen, et al. (2009), EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and ... , Geochem. Geophys. Geosyst., 10, doi: 10.1029/2009GC002471 - Data: NOAA, Boulder, CO, USA. Reference: Maus, S., U. Barckhausen, et al. (2009), EMAG2: A 2-arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and ... , Geochem. Geophys. Geosyst., 10, doi: 10.1029/2009GC002471