Spatial Representation Information
Reference System Information
Identification Information
Content Information
Distribution Information
Data Quality Information
Data Quality Information
Metadata Maintenance Information
Metadata: uuid: 4bbc34f4-179b-4a40-8398-e12e8581800c
File identifier:
gov.noaa.ngdc.mgg.geophysical_models:EMAG2_V3
Hierarchy level:
Scope code:
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Metadata author: title: NCEI (pointOfContact)
Responsible party: uuid: 440b3ac2-64a5-46e2-9846-38305718b644
Organisation name:
NOAA National Centers for Environmental Information
Contact info:
Contact:
Address:
Address:
Electronic mail address:
ncei.info@noaa.gov
Online Resource:
Online Resource:
Linkage:
URL:
https://www.ncei.noaa.gov/contact
Name:
NCEI Contact Information
Description:
Information for contacts at NCEI.
Function:
Online function code:
information
Role:
Role code:
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Date stamp:
2020-05-14
Metadata standard name:
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
Metadata standard version:
ISO 19115-2:2009(E)
Return To Index
Spatial representation info:
Grid spatial representation:
Number of dimensions:
2
Axis Dimension Properties:
Dimension:
Dimension name:
Dimension name type code:
row
Dimension size:
10801
Resolution:
uom: decimalDegrees .0333
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Dimension name type code:
column
Dimension size:
5401
Resolution:
uom: decimalDegrees .0333
Cell geometry:
Cell geometry code:
area
Transformation parameter availability:
true
Return To Index
Reference system info: title: WGS84
Reference system: uuid: 2504d000-8345-11e1-b0c4-0800200c9a66
Reference system identifier:
RS Identifier:
Authority:
Citation:
Title:
World Geodetic System 1984
Alternate title:
WGS 84
Date:
Date:
Date:
2007-08-27
Date type:
Date type code:
revision
Cited responsible party:
Responsible party:
Organisation name:
withheld
Contact info:
Contact:
Online Resource:
Online Resource:
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URL:
https://epsg.org/crs_4326/WGS-84.html
Name:
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Cited responsible party: title: EPSG Registry
Responsible party: uuid: 68498237-c535-48dd-a292-17c2fc36cb97
Organisation name:
European Petroleum Survey Group
Contact info:
Contact:
Online Resource:
Online Resource:
Linkage:
URL:
https://epsg.org/home.html
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:
Online function code:
search
Role:
Role code:
publisher
Code:
urn:ogc:def:crs:EPSG::4326
Return To Index
Identification info:
Data identification:
Citation:
Citation:
Title:
EMAG2v3: Earth Magnetic Anomaly Grid (2-arc-minute resolution)
Date:
Date:
Date:
2017-05-30
Date type:
Date type code:
publication
Edition:
Version 3
Edition date:
2017-05-30
Identifier:
Identifier:
Authority:
Citation:
Title:
International DOI Foundation (IDF)
Date:
inapplicable
Code:
Anchor: xlink: https://doi.org/10.7289/V5H70CVX title: DOI
doi:10.7289/V5H70CVX
Identifier:
Identifier:
Authority:
Citation:
Title:
NOAA National Centers for Environmental Information
Date:
inapplicable
Code:
NCEI Metadata ID: gov.noaa.ngdc.mgg.geophysical_models:EMAG2_V3
Cited responsible party:
Responsible party:
Organisation name:
NOAA National Centers for Environmental Information
Role:
Role code:
publisher
Cited responsible party:
Responsible party:
Position name:
NCEI Geomagnetic Modeling Team
Role:
Role code:
originator
Cited responsible party:
Responsible party:
Individual name:
Brian Meyer
Role:
Role code:
author
Cited responsible party:
Responsible party:
Individual name:
Richard Saltus
Role:
Role code:
author
Cited responsible party:
Responsible party:
Individual name:
Arnaud Chulliat
Role:
Role code:
author
Presentation form:
Presentation form code:
mapDigital
Abstract:
EMAG2v3 is a global Earth Magnetic Anomaly Grid compiled from satellite, ship, and airborne magnetic
measurements. It is a significant update of the previous release of the Earth Magnetic Anomaly Grid. The
resolution remains 2 arc-minutes, and the altitude of 4 km above the geoid is still supported, but an
additional product, a grid that is observed at sea-level over oceanic regions, has been produced. New
additions 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 using a kriging algorithm, which
specializes in heterogeneous data distribution gridding, in order to create a compilation as true to the
observed data as possible, and avoid using a priori information. The longest wavelengths (>300 km) were
replaced with the latests satellite lithosphere magnetic field model, MF7.
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:
Progress code:
completed
Status:
Progress code:
historicalArchive
Point of contact: title: NCEI (pointOfContact)
Responsible party: uuid: 440b3ac2-64a5-46e2-9846-38305718b644
Organisation name:
NOAA National Centers for Environmental Information
Contact info:
Contact:
Address:
Address:
Electronic mail address:
ncei.info@noaa.gov
Online Resource:
Online Resource:
Linkage:
URL:
https://www.ncei.noaa.gov/contact
Name:
NCEI Contact Information
Description:
Information for contacts at NCEI.
Function:
Online function code:
information
Role:
Role code:
pointOfContact
Point of contact: title: Geomagnetic Modeling Team
Responsible party: uuid: 75ff8b8b-8a08-49b9-a469-e3f35bdf6164
Organisation name:
NOAA National Centers for Environmental Information
Position name:
NCEI Geomagnetic Modeling Team
Contact info:
Contact:
Address:
Address:
Electronic mail address:
geomag.models@noaa.gov
Role:
Role code:
pointOfContact
Resource maintenance:
Maintenance information:
Maintenance and update frequency:
Maintenance frequency code:
asNeeded
Graphic overview:
BrowseGraphic:
File name:
http://www.ngdc.noaa.gov/geomag/image/EMAG2_V3_UpCont_WestCoastUS.png
File description:
EMAG2v3 showing the west coast of the United States and Canada. The stripes are magnetic lineations due to
sea-floor spreading.
File type:
png
Descriptive keywords:
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:
Keyword type code:
theme
Thesaurus name: title: GCMD Science Keywords
Citation: uuid: 227737d0-428b-11df-9879-0800200c9a66
Title:
Global Change Master Directory (GCMD) Science Keywords
Date:
Date:
Date:
2020-01-09
Date type:
Date type code:
publication
Edition:
9.1
Cited responsible party: title: GCMD Landing Page
Responsible party: uuid: 1edb41d0-428a-11df-9879-0800200c9a66
Organisation name:
NASA Goddard Space Flight Center, Earth Science Data and Information System
Contact info:
Contact:
Online Resource:
Online Resource:
Linkage:
URL:
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Name:
Global Change Master Directory (GCMD) Keywords
Description:
The information provided on this page seeks to define how the GCMD Keywords are
structured, used and accessed. It also provides information on how users can participate
in the further development of the keywords.
Function:
Online function code:
information
Role:
Role code:
custodian
Descriptive keywords:
Keywords:
Keyword:
Geographic Region > Global
Type:
Keyword type code:
place
Thesaurus name: title: GCMD Location Keywords
Citation: uuid: 82A5DD19565ACBECE040AC8C5AB41A40
Title:
Global Change Master Directory (GCMD) Location Keywords
Date:
Date:
Date:
2020-01-09
Date type:
Date type code:
publication
Edition:
9.1
Cited responsible party: title: GCMD Landing Page
Responsible party: uuid: 1edb41d0-428a-11df-9879-0800200c9a66
Organisation name:
NASA Goddard Space Flight Center, Earth Science Data and Information System
Contact info:
Contact:
Online Resource:
Online Resource:
Linkage:
URL:
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Name:
Global Change Master Directory (GCMD) Keywords
Description:
The information provided on this page seeks to define how the GCMD Keywords are
structured, used and accessed. It also provides information on how users can participate
in the further development of the keywords.
Function:
Online function code:
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Role:
Role code:
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Commerce
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DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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Citation: uuid: 9f0de6e6-428b-11df-9879-0800200c9a66
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Date:
Date:
Date:
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Date type:
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Edition:
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Cited responsible party: title: GCMD Landing Page
Responsible party: uuid: 1edb41d0-428a-11df-9879-0800200c9a66
Organisation name:
NASA Goddard Space Flight Center, Earth Science Data and Information System
Contact info:
Contact:
Online Resource:
Online Resource:
Linkage:
URL:
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
Name:
Global Change Master Directory (GCMD) Keywords
Description:
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structured, used and accessed. It also provides information on how users can participate
in the further development of the keywords.
Function:
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Resource constraints: title: Distribution Liability
Legal constraints: uuid: dadd4ac3-2b9f-4db5-8603-71285b94c3d7
Access constraints:
Restriction code:
otherRestrictions
Other constraints:
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.
Resource constraints: title: Use Liability
Legal constraints: uuid: e8163b1b-fb5a-4f4e-8d5c-ed06da10e21b
Use constraints:
Restriction code:
otherRestrictions
Other constraints:
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.
Resource constraints: title: NCEI copyright
Constraints: uuid: 295cb881-4997-4a93-b31a-10855ef59b83
Use limitation:
Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection
within the United States.
Resource constraints: title: Navigation
Constraints: uuid: 103da706-402a-41cf-adc9-e709dd0ebea5
Use limitation:
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.
Resource constraints: title: NCEI Data Citation Statement
Legal constraints:
Use limitation:
Restriction code:
otherRestrictions
Other constraints:
Cite as: Brian Meyer; Richard Saltus; and Arnaud Chulliat. 2017: EMAG2v3: Earth Magnetic Anomaly Grid
(2-arc-minute resolution). Version 3. NOAA National Centers for Environmental Information.
https://doi.org/10.7289/V5H70CVX. Accessed [date].
Aggregation Info:
AggregateInformation:
Aggregate Data Set Name:
Citation:
Title:
Derivation and Error Analysis of the Earth Magnetic Anomaly Grid at 2 Arc-Minute Resolution Version 3
(EMAG2v3)
Date:
Date:
Date:
2017-12-19
Date type:
Date type code:
publication
Identifier:
Identifier:
Code:
Anchor: xlink: https://doi.org/10.1002/2017GC007280 title: DOI
doi:10.1002/2017GC007280
Cited responsible party:
Responsible party:
Organisation name:
Geochemistry, Geophysics, Geosystems
Role:
Role code:
publisher
Cited responsible party:
Responsible party:
Contact info:
Contact:
Online Resource:
Online Resource:
Linkage:
URL:
https://doi.org/10.1002/2017gc007280
Name:
Derivation and Error Analysis of the Earth Magnetic Anomaly Grid at 2 Arc-Minute
Resolution Version 3 (EMAG2v3)
Description:
A science paper about the construction and evaluation of the Earth Magnetic Anomaly Grid 2
Arc-Minute Resolution Version 3
Role:
Association Type:
Association type code:
crossReference
Initiative Type:
Initiative type code:
sciencePaper
Spatial representation type:
Spatial representation type code:
grid
Language:
eng; USA
Topic category:
Topic category code:
geoscientificInformation
Extent:
Extent:
Geographic element:
Geographic bounding box:
West bound longitude:
0
East bound longitude:
360
South bound latitude:
-90
North bound latitude:
90
Temporal element:
Temporal extent:
Extent:
Time period:
Begin date:
1946-01-01
End date:
2014-02-20
Return To Index
Content info:
Coverage Description:
Attribute description:
Grid Cell
Content type:
Content type code:
modelResult
Dimension:
Band:
Descriptor:
Magnetic Anomaly
Maximum value:
8632
Minimum value:
-3380
Value unit:
Base unit:
Identifier:
nanoTesla
Units system:
Range Element Description:
Range Element Description:
Name:
Empty Grid Cell
Definition:
Representation of grid cell with no measurement value.
Range Element:
99999
Return To Index
Distribution info:
Distribution:
Distributor:
Distributor:
Distributor contact: title: NCEI (distributor)
Responsible party: uuid: 440b3ac2-64a5-46e2-9846-38305718b644
Organisation name:
NOAA National Centers for Environmental Information
Contact info:
Contact:
Address:
Address:
Electronic mail address:
ncei.info@noaa.gov
Online Resource:
Online Resource:
Linkage:
URL:
https://www.ncei.noaa.gov/contact
Name:
NCEI Contact Information
Description:
Information for contacts at NCEI.
Function:
Online function code:
information
Role:
Role code:
distributor
Distribution Order Process:
Standard order process:
Fees:
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.
Ordering instructions:
Contact NCEI for other distribution options and instructions.
Distributor format:
Format:
Name:
XYZ/Zip
Version:
Version 3
Specification:
Comma delimited ASCII grid that contains i and j grid indicies, latitude and longitude cell centered
location information, magnetic anomalies at a consistent 4km elevation, magnetic anomalies at sea
level over oceanic regions, anomaly source grid code, and an error estimate for each cell.
Distributor format:
Format:
Name:
ASCII TXT
Version:
Version 3
Specification:
An ASCII text file which describes the format of the CSV data grid.
Distributor format:
Format:
Name:
PNG
Version:
Version 3
Specification:
Full Resolution Map of EMAG2v3 as a poster at a consistent 4km altitude
Distributor format:
Format:
Name:
PNG
Version:
Version 3
Specification:
Full Resolution Map of EMAG2v3 as a poster at sea level over oceanic regions
Distributor format:
Format:
Name:
KMZ
Version:
Version 3
Specification:
Plugin for Google Earth of EMAG2v3 as a poster at a consistent 4km altitude with data gaps filled with
MF7. Requires installation of Google Earth.
Distributor format:
Format:
Name:
GIS TIFF
Version:
Version 3
Specification:
A georeferenced TIFF (GeoTIFF) for EMAG2v3, where the altitude is 4km altitude above continental
regions and sea level over oceanic regions, 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.
Distributor format:
Format:
Name:
PNG
Version:
Version 3
Specification:
Full Resolution Map of EMAG2v3 codes to designate which grid is primarily responsible for the anomaly
value for each cell
Distributor format:
Format:
Name:
PNG
Version:
Version 3
Specification:
Full Resolution Map of EMAG2v3 estimates of the error in nanoTesla for each cell
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc.mgg.geophysical_models:EMAG2_V3/html
Protocol:
HTTPS
Name:
Metadata Landing Page
Function:
Online function code:
information
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
http://www.ngdc.noaa.gov/geomag/emag2.html
Protocol:
HTTPS
Name:
Home Page
Function:
Online function code:
information
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530.zip
Name:
EMAG2v3 ASCII CSV data file
Description:
Zip file containing the comma delimited ASCII grid that contains i and j grid indicies, latitude
and longitude cell centered location information, magnetic anomalies at a consistent 4km
elevation, sea level over oceanic regions, anomaly source grid code, and an error estimate for
each cell.
Function:
Online function code:
download
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_readme.txt
Name:
EMAG2v3 Format Description
Description:
ASCII text file that contains format description of the EMAG2v3 CSV data file.
Function:
Online function code:
download
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_UpCont_poster.png
Name:
EMAG2v3 Full Resolution Map of Upward Continued Anomalies
Description:
PNG of EMAG2v3 as a poster at a consistent 4km altitude.
Function:
Online function code:
download
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_SeaLevel_poster.png
Name:
EMAG2v3 Full Resolution Map of Sea Level Anomalies
Description:
PNG of EMAG2v3 as a poster at sea level over oceanic regions.
Function:
Online function code:
download
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_UpCont_MF7fill.kmz
Name:
Upward Continued Google Earth Image
Description:
KMZ plugin for Google Earth of EMAG2v3 as a poster at a consistent 4km altitude with data gaps
filled with MF7 values. Requires installation of Google Earth.
Function:
Online function code:
download
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_UpCont.tif
Name:
Upward Continued GIS TIFF
Description:
A georeferenced TIFF (GeoTIFF) for EMAG2v3, where the altitude is at a consistent 4km altitude,
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:
Online function code:
download
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_Sealevel.tif
Name:
Sea Level GIS TIFF
Description:
A georeferenced TIFF (GeoTIFF) for EMAG2v3, where the altitude is at sea level over oceanic
regions, 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:
Online function code:
download
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_Code_map.png
Name:
Map of Source Grid Codes
Description:
PNG of EMAG2v3 codes to designate which grid is primarily responsible for the anomaly value for
each cell.
Function:
Online function code:
download
Distributor transfer options:
Digital transfer options:
Online:
Online Resource:
Linkage:
URL:
https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_Error_map.png
Name:
Map of Estimated Error Values
Description:
PNG of EMAG2v3 estimates of the error in nanoTesla for each cell.
Function:
Online function code:
download
Return To Index
Data quality info: title: NCEI repository history
Data quality: uuid: b24b7720-4d3e-42f9-b6b8-88429d75e36b
Scope:
Scope:
Hierarchy level:
Scope code:
repository
Level description:
Scope description:
Other:
NOAA National Centers for Environmental Information
Lineage:
Lineage:
Process step:
Process Step:
Description:
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.
Date and time:
2015-04-22T00:00:00
Return To Index
Data quality info:
Data quality:
Scope:
Scope:
Hierarchy level:
Scope code:
model
Lineage:
Lineage:
Process step:
Process Step:
Description:
Trackline data selection. Data needed to report date/time of collection, total observed magnetic
field, collected during time where kp < 6o.
Processing Information:
Processing:
Identifier:
Identifier:
Code:
Processing steps were carried out collectively by the developers of the model.
Software Reference:
Citation:
Title:
Geosoft Oasis Montaj
Date:
Date:
Date:
2015-10-08
Date type:
Date type code:
revision
Process step:
Process Step:
Description:
From all original ship and airborne measurements: subtracted main and external fields given by the
Comprehensive Model 4(Sabaka et al., 2004)
Processing Information:
Processing:
Identifier:
Identifier:
Code:
Processing steps were carried out collectively by the developers of the model.
Software Reference:
Citation:
Title:
Geosoft Oasis Montaj
Date:
Date:
Date:
2015-10-08
Date type:
Date type code:
revision
Process step:
Process Step:
Description:
Airborne data downward continued to sea-level
Processing Information:
Processing:
Identifier:
Identifier:
Code:
Processing steps were carried out collectively by the developers of the model.
Software Reference:
Citation:
Title:
Geosoft Oasis Montaj
Date:
Date:
Date:
2015-10-08
Date type:
Date type code:
revision
Process step:
Process Step:
Description:
Gridded trackline data using a krigging algorithm. Smoothing was applied where necessary.
Processing Information:
Processing:
Identifier:
Identifier:
Code:
Processing steps were carried out collectively by the developers of the model.
Software Reference:
Citation:
Title:
Geosoft Oasis Montaj
Date:
Date:
Date:
2015-10-08
Date type:
Date type code:
revision
Process step:
Process Step:
Description:
Precompiled grids had wavelengths greather than 300km replaced with values from MF7.
Processing Information:
Processing:
Identifier:
Identifier:
Code:
Processing steps were carried out collectively by the developers of the model.
Software Reference:
Citation:
Title:
Geosoft Oasis Montaj
Date:
Date:
Date:
2015-10-08
Date type:
Date type code:
revision
Return To Index
Metadata maintenance:
Maintenance information:
Maintenance and update frequency:
Maintenance frequency code:
asNeeded
Maintenance note:
Modified for compliance to NCEI Template v1.2.
Return To Index