Package org.orekit.models.earth
This package provides models that simulate certain physical phenomena
of Earth and the nearEarth environment.
Currently the following models are included:
 Tropospheric Delay
 Ionospheric Delay
 Global weather
 Geomagnetic Field
 Geoid
 Atmospheric refraction
 Displacement of ground points
 Tessellation of zones of interest as tiles
 Sampling of zones of interest as grids of points
Geoid
A Geoid is an equipotential surface of Earth's gravity field. This package
provides the means to compute a Geoid from the gravity field harmonic
coefficients, as in the following example. See the comment for Geoid
for some important caveats.
ReferenceEllipsoid ellipsoid
= new ReferenceEllilpsoid(a, f, bodyFrame, GM, spin);
Geoid geoid = new Geoid(
GravityFieldFactory.getNormalizedProvider(degree, order),
ellipsoid);
double undulation = geoid.getUndulation(lat, lon, date);
 Author:
 T. Neidhart, E. Ward

Interface Summary Interface Description EarthShape All models of Earth's shape have some common properties that are not shared with arbitraryBodyShape
s.GeoMagneticFields Methods for obtaining geomagnetic fields. 
Class Summary Class Description EarthITU453AtmosphereRefraction Implementation of refraction model for Earth exponential atmosphere based on ITUR P.8347 recommendation.EarthStandardAtmosphereRefraction Implementation of refraction model for Earth standard atmosphere.Geoid A geoid is a level surface of the gravity potential of a body.GeoMagneticElements Contains the elements to represent a magnetic field at a single point.GeoMagneticField Used to calculate the geomagnetic field at a given geodetic point on earth.GeoMagneticFieldFactory Factory for differentGeoMagneticField
models.GeoMagneticModelLoader Loads geomagnetic field models from a given input stream.LazyLoadedGeoMagneticFields Loads magnetic fields on request and can be configured after creation.ReferenceEllipsoid A Reference Ellipsoid for use in geodesy. 
Enum Summary Enum Description GeoMagneticFieldFactory.FieldModel The currently supported geomagnetic field models.