Package org.orekit.forces.gravity.potential

Interface GravityFields

All Known Implementing Classes:

LazyLoadedGravityFields

public interface GravityFields

Defines methods for obtaining gravity fields.

Since:

10.1

Author:

Evan Ward, Fabien Maussion, Pascal Parraud, Luc Maisonobe

See Also:

• GravityFieldFactory

Method Summary

Modifier and Type	Method	Description
NormalizedSphericalHarmonicsProvider	getConstantNormalizedProvider(int degree, int order, AbsoluteDate freezingDate)	Get a constant gravity field normalized coefficients provider frozen at a given epoch.
UnnormalizedSphericalHarmonicsProvider	getConstantUnnormalizedProvider(int degree, int order, AbsoluteDate freezingDate)	Get a constant gravity field unnormalized coefficients provider frozen at a given epoch.
NormalizedSphericalHarmonicsProvider	getNormalizedProvider(int degree, int order)	Get a gravity field normalized coefficients provider.
List<OceanTidesWave>	getOceanTidesWaves(int degree, int order)	Get the ocean tides waves.
UnnormalizedSphericalHarmonicsProvider	getUnnormalizedProvider(int degree, int order)	Get a gravity field unnormalized coefficients provider.

Method Details

getConstantNormalizedProvider

NormalizedSphericalHarmonicsProvider getConstantNormalizedProvider(int degree,
 int order,
 AbsoluteDate freezingDate)

Get a constant gravity field normalized coefficients provider frozen at a given epoch.

Parameters:

degree - maximal degree

order - maximal order

freezingDate - freezing epoch

Returns:

a gravity field coefficients provider containing already loaded data

Since:

12.0

See Also:

• getNormalizedProvider(int, int)

getNormalizedProvider

NormalizedSphericalHarmonicsProvider getNormalizedProvider(int degree,
 int order)

Get a gravity field normalized coefficients provider.

Parameters:

degree - maximal degree

order - maximal order

Returns:

a gravity field coefficients provider containing already loaded data

Since:

6.0

See Also:

• getConstantNormalizedProvider(int, int, AbsoluteDate)

getConstantUnnormalizedProvider

UnnormalizedSphericalHarmonicsProvider getConstantUnnormalizedProvider(int degree,
 int order,
 AbsoluteDate freezingDate)

Get a constant gravity field unnormalized coefficients provider frozen at a given epoch.

Parameters:

degree - maximal degree

order - maximal order

freezingDate - freezing epoch

Returns:

a gravity field coefficients provider containing already loaded data

Since:

12.0

See Also:

• getUnnormalizedProvider(int, int)

getUnnormalizedProvider

UnnormalizedSphericalHarmonicsProvider getUnnormalizedProvider(int degree,
 int order)

Get a gravity field unnormalized coefficients provider.

Parameters:

degree - maximal degree

order - maximal order

Returns:

a gravity field coefficients provider containing already loaded data

Since:

6.0

See Also:

• getConstantUnnormalizedProvider(int, int, AbsoluteDate)

getOceanTidesWaves

List<OceanTidesWave> getOceanTidesWaves(int degree,
 int order)

Get the ocean tides waves.

WARNING: as of 2013-11-17, there seem to be an inconsistency when loading one or the other file, for wave Sa (Doodson number 56.554) and P1 (Doodson number 163.555). The sign of the coefficients are different. We think the problem lies in the input files from IERS and not in the conversion (which works for all other waves), but cannot be sure. For this reason, ocean tides are still considered experimental at this date.

Parameters:

degree - maximal degree

order - maximal order

Returns:

list of tides waves containing already loaded data

Since:

6.1