Package org.orekit.models.earth

This package provides models that simulate certain physical phenomena of Earth and the near-Earth environment.

Currently the following models are included:

• Tropospheric Delay
• 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 arbitrary BodyShapes.
IonosphericModel	Defines a ionospheric model, used to calculate the path delay imposed to electro-magnetic signals between an orbital satellite and a ground station.
TroposphericModel	Defines a tropospheric model, used to calculate the path delay imposed to electro-magnetic signals between an orbital satellite and a ground station.

Class Summary

Class	Description
EarthITU453AtmosphereRefraction	Implementation of refraction model for Earth exponential atmosphere based on ITU-R P.834-7 recommendation.
EarthStandardAtmosphereRefraction	Implementation of refraction model for Earth standard atmosphere.
FixedTroposphericDelay	A static tropospheric model that interpolates the actual tropospheric delay based on values read from a configuration file (tropospheric-delay.txt) via the DataProvidersManager.
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 different GeoMagneticField models.
GeoMagneticModelLoader	Loads geomagnetic field models from a given input stream.
KlobucharIonoCoefficientsLoader	Loads Klobuchar-Style ionospheric coefficients a given input stream.
KlobucharIonoModel	Klobuchar ionospheric delay model.
MariniMurrayModel	The Marini-Murray tropospheric delay model for laser ranging.
ReferenceEllipsoid	A Reference Ellipsoid for use in geodesy.
SaastamoinenModel	The modified Saastamoinen model.

Enum Summary

Enum	Description
GeoMagneticFieldFactory.FieldModel	The currently supported geomagnetic field models.