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The World Magnetic Model (WMM) is a large spatial-scale representation of the Earth's magnetic field. It was developed jointly by the US National Geophysical Data Center and the British Geological Survey. The data and updates are issued by the US National Geospatial-Intelligence Agency and the UK Defence Geographic Centre. [1]
In conjunction, they make the World Magnetic Model, that predicts where the pole should be at any time. The model plays a role in the GPS systems we use on a day-to-day basis.
In a new report from NOAA, the "World Magnetic Model" for 2020 is revealed, and it shows that the pole is speeding toward northern Russia. That trend, however, is expected to change.
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The World Geodetic System (WGS) is a standard used in cartography, geodesy, and satellite navigation including GPS. The current version, WGS 84 , defines an Earth-centered, Earth-fixed coordinate system and a geodetic datum , and also describes the associated Earth Gravitational Model (EGM) and World Magnetic Model (WMM).
The magnetic North Pole is moving so quickly that scientists are having to urgently update maps used for navigation systems, a report in science journal Nature said.
The position of the anomaly can be that of the maximum magnetic flux or that of the centroid of the flux, which is less sensitive to sampling noise and more representative of the feature as a whole. In January 2021, the centroid was located near 26°37′S 49°04′W / 26.61°S 49.06°W / -26.61; -49.06 and drifting about 0.23°S 0. ...
Another global field model, called the World Magnetic Model, is produced jointly by the United States National Centers for Environmental Information (formerly the National Geophysical Data Center) and the British Geological Survey. This model truncates at degree 12 (168 coefficients) with an approximate spatial resolution of 3,000 kilometers.