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Metadata Identifier: gov.noaa.ngdc.mgg.geophysical_models:US_Historic_Declination_Calculator
MD_DataIdentification
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US Historic Declination Calculator |
This programs derives a table of secular change in magnetic declination for
a specified point in the conterminous United States. It utilizes the USD polynomial
and the IGRF spherical harmonic models. Declination is shown to the nearest minute
so that secular change may be properly illustrated, but it is usually only accurate
to within 30 minutes.
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SV_Identification
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IGRF11 Spherical Harmonic Model. |
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International Geomagnetic Reference Field 11 |
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GCMD Data Center Keywords |
NASA/GCMD Data Center Keywords |
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GCMD Location Keywords |
NASA/GCMD Location Keywords |
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GCMD Science Keywords |
NASA/GCMD Science Keywords |
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Polynomial US Historic Declination Calculator and the IGRF - Eleventh Generation |
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US Historic Declination Calculator |
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World Geodetic System 1984 |
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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/#ushistoric |
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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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The US Historic Declination Polynomial model was merged with
the IGRF11 to create a smooth transition from the historic observations (pre 1900)
to the more current models and observations (those made after 1900).
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urn:ogc:def:crs:EPSG::4326 |
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Bounding Box |
Temporal Extent |
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-180 |
180 |
90 |
-90 |
1750-01-01 |
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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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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2000-03-15 |
USD was developed largely based on a ground-network of US repeat stations
whose density and coveraged changed as the US settlements moved westward. The USD
polynomial intentionally has as much "wiggle" in the declination lines as was possible
to model to provide the most accurate model of declination for survey use.
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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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NGDC server accesses a C executable, inputs the user data and runs
the executable to obtain desired output parameters.
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