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Metadata Identifier: gov.noaa.ngdc.mgg.geophysical_models:Declination_Calculator
MD_DataIdentification
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Declination Calculator |
Declination is calculated using the current International Geomagnetic Reference
Field (IGRF) model. While results are typically accurate to 30 minutes of arc, users
should be aware that several environmental factors can cause disturbances in the magnetic
field.
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SV_Identification
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http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso |
GCMD Feedback Form |
Have a Comment for the GCMD? |
information |
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GCMD Keyword Page |
http://gcmd.nasa.gov/learn/keyword_list.html |
GCMD Keywords Page |
This page describes the NASA GCMD Keywords, how to reference those keywords and provides
download instructions.
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information |
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http://www.epsg-registry.org/ |
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.
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search |
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http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4326 |
WGS 84 |
GML of World Geodetic System 1984 coordinate reference system. |
information |
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http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html |
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http://www.ngdc.noaa.gov/geomag-web/#declination |
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Processing steps were carried out collectively by the developers
of the model. These developers are listed as authors of the associated paper "International
Geomagnetic Reference Field: the eleventh generation".
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urn:ogc:def:crs:EPSG::4326 |
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Bounding Box |
Temporal Extent |
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The IGRF is a global model that extends back to the begining of the 20th Century and
is updated every 5 years to include a forcast model for the following 5 years using
observations of the Earth's magnetic field over time to interpolate
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180 |
90 |
-90 |
1900-01-01 |
2014-12-31 |
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CSV Format |
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The Declination Calculator creates an Comma Seperated Variable (CSV) file which reports
the location and date queried as well as the declination and the annual change in
declination in decimal minutes per year.
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HTML Format |
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The Declination Calculator creates an HTML pop-up window which superimposes a compass
rose, indicating the declination, onto the location queried and reports the annual
change in declination.
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PDF Format |
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The Declination Calculator creates a Portable Document Format file (PDF) file which
reports the location and date queried as well as the declination and the annual change
in declination in decimal minutes per year.
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XML Format |
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The Declination Calculator creates an XML file which reports the location and date
queried as well as the declination and the annual change in declination in decimal
minutes per year.
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NGDC Copyright |
Produced by the NOAA National Geophysical Data Center. Not subject to
copyright protection within the United States.
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WGS 84 |
urn:ogc:def:crs:EPSG::4326 |
World Geodetic System 1984 |
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IGRF 11 |
International Geomagnetic Reference Field 11 |
2010-10-12 |
The IGRF is the product of a collaborative effort between magnetic
field modellers and the institutes involved in collecting and disseminating magnetic
field data from satellites and from observatories and surveys around the world. The
IGRF is a series of mathematical models of the Earth's main field and its annual rate
of change (secular variation).
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User input of area of interest and time for desired data grid into
a web interface.
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User data is sent via HTTP request to a java servelet hosted on a
local NGDC server. This checks that all of the necessary information to run the model
executable correctly is present and in the correct format.
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NGDC server accesses a C executable, in this case the IGRF executable,
and inputs the user data and runs the executable to obtain desired output parameters
in XML format.
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The XML created by the executable is sent back to NGDC server and
input into the Java servelet which reformats the output into the format designated
by the user at the begining of the process. This reformatted information is returned
to the User's webpage.
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