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.

Citation proposal
(2010) . Earth Magnetic Anomaly Grid 1:35,000,000 (2 arc-minute resolution) (EMAG2). https://gdk.gdi-de.org/geonetwork/srv/api/records/CF387546-B217-43D3-8781-8BEF8250253B

INSPIRE
SDS

INSPIRE

Identification

File identifier: CF387546-B217-43D3-8781-8BEF8250253B XML

Hierarchy level: dataset Dataset

Online resource

Resource identifier

code: B3CCFEA1-9E87-4593-B4AB-6D441AA752C1

Metadata language: eng 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

Classification of data and services

Topic category

Geoscientific information

Classification of data and services

Coupled resource

Classification of data and services

Coupled resource

Keywords

GEMET - INSPIRE themes, version 1.0 ( Theme )

Geologie

GEMET - Concepts, version 2.4 ( Theme )

geophysics
Geophysik

Other keywords

Keywords ( Theme )

Earth magnetic field
Erdmagnetfeld
Weltkarte
world map

Keywords ( Place )

Weltweit

Geographic coverage

Temporal reference

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

Restrictions on access and use

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