| java.lang.Object | |
| ↳ | android.hardware.GeomagneticField |
Estimates magnetic field at a given point on Earth, and in particular, to compute the magnetic declination from true north.
This uses the World Magnetic Model produced by the United States National Geospatial-Intelligence Agency. More details about the model can be found at http://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml. This class currently uses WMM-2010 which is valid until 2015, but should produce acceptable results for several years after that. Future versions of Android may use a newer version of the model.
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Estimate the magnetic field at a given point and time.
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From class
java.lang.Object
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Estimate the magnetic field at a given point and time.
| gdLatitudeDeg | Latitude in WGS84 geodetic coordinates -- positive is east. |
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| gdLongitudeDeg | Longitude in WGS84 geodetic coordinates -- positive is north. |
| altitudeMeters | Altitude in WGS84 geodetic coordinates, in meters. |
| timeMillis | Time at which to evaluate the declination, in milliseconds since January 1, 1970. (approximate is fine -- the declination changes very slowly). |
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