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http://www.ngdc.noaa.gov/geomag/emag2.html |
Home Page |
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information |
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https://doi.org/10.1002/2017gc007280 |
Derivation and Error Analysis of the Earth Magnetic Anomaly Grid at 2 Arc-Minute Resolution
Version 3 (EMAG2v3) |
A science paper about the construction and evaluation of the Earth Magnetic Anomaly
Grid 2 Arc-Minute Resolution Version 3 |
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https://epsg.org/crs_4326/WGS-84.html |
WGS 84 |
GML of World Geodetic System 1984 coordinate reference system. |
information |
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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 |
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https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords |
Global Change Master Directory (GCMD) Keywords |
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. |
information |
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https://www.ncei.noaa.gov/contact |
NCEI Contact Information |
Information for contacts at NCEI. |
information |
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https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ngdc.mgg.geophysical_models:EMAG2_V3/html |
Metadata Landing Page |
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information |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530.zip |
EMAG2v3 ASCII CSV data file |
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. |
download |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_Code_map.png |
Map of Source Grid Codes |
PNG of EMAG2v3 codes to designate which grid is primarily responsible for the anomaly
value for each cell. |
download |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_Error_map.png |
Map of Estimated Error Values |
PNG of EMAG2v3 estimates of the error in nanoTesla for each cell. |
download |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_SeaLevel_poster.png |
EMAG2v3 Full Resolution Map of Sea Level Anomalies |
PNG of EMAG2v3 as a poster at sea level over oceanic regions. |
download |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_Sealevel.tif |
Sea Level GIS TIFF |
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. |
download |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_UpCont.tif |
Upward Continued GIS TIFF |
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. |
download |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_UpCont_MF7fill.kmz |
Upward Continued Google Earth Image |
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. |
download |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_V3_20170530_UpCont_poster.png |
EMAG2v3 Full Resolution Map of Upward Continued Anomalies |
PNG of EMAG2v3 as a poster at a consistent 4km altitude. |
download |
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https://www.ngdc.noaa.gov/geomag/data/EMAG2/EMAG2_V3_20170530/EMAG2_readme.txt |
EMAG2v3 Format Description |
ASCII text file that contains format description of the EMAG2v3 CSV data file. |
download |
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ASCII TXT |
Version 3 |
An ASCII text file which describes the format of the CSV data grid. |
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GIS TIFF |
Version 3 |
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. |
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KMZ |
Version 3 |
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. |
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PNG |
Version 3 |
Full Resolution Map of EMAG2v3 as a poster at a consistent 4km altitude |
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XYZ/Zip |
Version 3 |
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. |
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Trackline data selection. Data needed to report date/time of collection, total observed
magnetic field, collected during time where kp < 6o.
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From all original ship and airborne measurements: subtracted main and external fields
given by the Comprehensive Model 4(Sabaka et al., 2004)
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Airborne data downward continued to sea-level
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Gridded trackline data using a krigging algorithm. Smoothing was applied where necessary.
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Precompiled grids had wavelengths greather than 300km replaced with values from MF7.
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2015-04-22T00:00:00 |
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.
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