Earth Magnetic Anomaly Grid 1:35,000,000 (2 arc-minute resolution) (EMAG2)

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.

INSPIRE

Identification

File identifier
CF387546-B217-43D3-8781-8BEF8250253B XML
Hierarchy level
Dataset
Online resource
Resource identifier
code

B3CCFEA1-9E87-4593-B4AB-6D441AA752C1
Metadata language
English
Spatial representation type
Grid
Encoding
Format

PDF
Version

n/a
Format

JPEG
Version

n/a
Format

TIFF
Version

n/a
Format

gedruckt
Version

n/a
Projection
code
EPSG:4326
 

Classification of data and services

Topic category
  • Geoscientific information
 

Classification of data and services

Coupled resource

Coupled resource
 
 

Classification of data and services

Coupled resource

Coupled resource
 
 

Keywords

GEMET - INSPIRE themes, version 1.0

  • Geologie

GEMET - Concepts, version 2.4

  • geophysics

  • Geophysik

Other keywords

Theme

  • Earth magnetic field

  • Erdmagnetfeld

  • Weltkarte

  • world map
Place

  • Weltweit
 
 

Geographic coverage

N
S
E
W
thumbnail


 

Temporal reference

Temporal extent
Temporal extent
Date (Publication)
2010-11-10
 

Quality and validity

Lineage

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
Denominator
35000000
 

Conformity

Conformity
Conformity
 

Conformity

Conformity
Conformity
 

Restrictions on access and use

Access constraints
Es gelten keine Zugriffsbeschränkungen
Access constraints

Allgemeine Geschäftsbedingungen, s. https://www.bgr.bund.de/agb - General Terms and Conditions, s. https://www.bgr.bund.de/agb_en

Access constraints

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

 

Responsible organization (s)

Contact for the resource
Organisation name

Bundesanstalt für Geowissenschaften und Rohstoffe
Email

Udo.Barckhausen@bgr.de

 

Responsible organization (s)

Contact for the resource
Organisation name

Bundesanstalt für Geowissenschaften und Rohstoffe
Email

Udo.Barckhausen@bgr.de

 

Metadata information

Contact for the metadata
Organisation name

Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
Email

geodatenmanagement@bgr.de

Date stamp
2025-02-12
Metadata language
English
Character set
UTF8
 
 

SDS

Conformance class 1: invocable

Access Point URL
Endpoint URL
Technical specification
 

Conformance class 2: interoperable

Access constraints

Limitation
 

Use constraints

Limitation
 

Responsible custodian

Contact for the resource
 
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

Earth magnetic field Erdmagnetfeld Weltkarte world map
GEMET - Concepts, version 2.4
Geophysik geophysics
GEMET - INSPIRE themes, version 1.0
Geologie

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Associated resources

Not available