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
DiscreteTroposphericModel	Defines a tropospheric model, used to calculate the path delay imposed to electro-magnetic signals between an orbital satellite and a ground station.
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.
MappingFunction	Interface for mapping functions used in the tropospheric delay computation.
TroposphericModel	Defines a tropospheric model, used to calculate the path delay imposed to electro-magnetic signals between an orbital satellite and a ground station.
WeatherModel	Defines a surface meteorology model that can be used to compute the different weather parameters (pressure, temperature, ...).

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.
EstimatedTroposphericModel	An estimated tropospheric model.
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.
GlobalMappingFunctionModel	The Global Mapping Function model for radio techniques.
GlobalPressureTemperature2Model	The Global Pressure and Temperature 2 (GPT2) model.
GlobalPressureTemperatureModel	The Global Pressure and Temperature model.
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.
MendesPavlisModel	The Mendes - Pavlis tropospheric delay model for optical techniques.
NiellMappingFunctionModel	The Niell Mapping Function model for radio wavelengths.
ReferenceEllipsoid	A Reference Ellipsoid for use in geodesy.
SaastamoinenModel	The modified Saastamoinen model.
ViennaModelCoefficientsLoader	Loads Vienna tropospheric coefficients a given input stream.
ViennaOneModel	The Vienna1 tropospheric delay model for radio techniques.
ViennaThreeModel	The Vienna3 tropospheric delay model for radio techniques.

Enum Summary

Enum	Description
GeoMagneticFieldFactory.FieldModel	The currently supported geomagnetic field models.
ViennaModelType	Enumerate for Vienna tropospheric model 1 and 3.