org.orekit.frames.configuration.eop
Class AbstractEOPHistory

java.lang.Object
  org.orekit.frames.configuration.eop.AbstractEOPHistory

All Implemented Interfaces:

Serializable, Iterable<TimeStamped>, EOPHistory

Direct Known Subclasses:

EOP1980History, EOP2000History

public abstract class AbstractEOPHistory
extends Object
implements Serializable, EOPHistory

This class loads any kind of Earth Orientation Parameter data throughout a large time range.

Author:

Pascal Parraud

See Also:

Serialized Form

Constructor Summary

protected

AbstractEOPHistory(EOPInterpolators interpMethod) Simple constructor.

Method Summary

void	addEntry(EOPEntry entry) Add an Earth Orientation Parameters entry.
void	checkEOPContinuity(double maxGap) Check Earth orientation parameters continuity.
AbsoluteDate	getEndDate() Get the date of the last available Earth Orientation Parameters.
EOPInterpolators	getEOPInterpolationMethod() Return the EOP interpolation method.
double	getLOD(AbsoluteDate date) Get the LoD (Length of Day) value.
protected EOPEntry[]	getNeighbors(AbsoluteDate central) Get the entries surrounding a central date.
NutationCorrection	getNutationCorrection(AbsoluteDate date) Get the correction to the nutation parameters.
PoleCorrection	getPoleCorrection(AbsoluteDate date) Get the pole IERS Reference Pole correction.
AbsoluteDate	getStartDate() Get the date of the first available Earth Orientation Parameters.
double	getUT1MinusTAI(AbsoluteDate date) Get the UT1-TAI value.
double	getUT1MinusUTC(AbsoluteDate date) Get the UT1-UTC value.
Iterator<TimeStamped>	iterator()
int	size() Get the number of entries in the history.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractEOPHistory

protected AbstractEOPHistory(EOPInterpolators interpMethod)

Simple constructor.

Parameters:

interpMethod - EOP interpolation method

Method Detail

addEntry

public void addEntry(EOPEntry entry)

Add an Earth Orientation Parameters entry.

Parameters:

entry - entry to add

iterator

public Iterator<TimeStamped> iterator()

Specified by:

iterator in interface Iterable<TimeStamped>

size

public int size()

Get the number of entries in the history.

Specified by:

size in interface EOPHistory

Returns:

number of entries in the history

getEOPInterpolationMethod

public EOPInterpolators getEOPInterpolationMethod()

Return the EOP interpolation method.

Specified by:

getEOPInterpolationMethod in interface EOPHistory

Returns:

eop interpolation method

getStartDate

public AbsoluteDate getStartDate()

Get the date of the first available Earth Orientation Parameters.

Specified by:

getStartDate in interface EOPHistory

Returns:

the start date of the available data

getEndDate

public AbsoluteDate getEndDate()

Get the date of the last available Earth Orientation Parameters.

Specified by:

getEndDate in interface EOPHistory

Returns:

the end date of the available data

getUT1MinusUTC

public double getUT1MinusUTC(AbsoluteDate date)

Get the UT1-UTC value.

The data provided comes from the IERS files. It is smoothed data.

Specified by:

getUT1MinusUTC in interface EOPHistory

Parameters:

date - date at which the value is desired

Returns:

UT1-UTC in seconds (0 if date is outside covered range)

getUT1MinusTAI

public double getUT1MinusTAI(AbsoluteDate date)

Get the UT1-TAI value.

The data provided comes from the IERS files. It is smoothed data.

Specified by:

getUT1MinusTAI in interface EOPHistory

Parameters:

date - date at which the value is desired

Returns:

UT1-TAI in seconds (0 if date is outside covered range)

getNeighbors

protected EOPEntry[] getNeighbors(AbsoluteDate central)
                           throws TimeStampedCacheException

Get the entries surrounding a central date.

Parameters:

central - central date

Returns:

array of cached entries surrounding specified date

Throws:

TimeStampedCacheException - if EOP data cannot be retrieved

getLOD

public double getLOD(AbsoluteDate date)

Get the LoD (Length of Day) value.

The data provided comes from the IERS files. It is smoothed data.

Specified by:

getLOD in interface EOPHistory

Parameters:

date - date at which the value is desired

Returns:

LoD in seconds (0 if date is outside covered range)

getPoleCorrection

public PoleCorrection getPoleCorrection(AbsoluteDate date)
                                 throws TimeStampedCacheException

Get the pole IERS Reference Pole correction.

The data provided comes from the IERS files. It is smoothed data.

Parameters:

date - date at which the correction is desired

Returns:

pole correction (PoleCorrection.NULL_CORRECTION if date is outside covered range)

Throws:

TimeStampedCacheException - for TimeStampedCache problems

getNutationCorrection

public NutationCorrection getNutationCorrection(AbsoluteDate date)

Get the correction to the nutation parameters.

The data provided comes from the IERS files. It is smoothed data.

Parameters:

date - date at which the correction is desired

Returns:

nutation correction (NutationCorrection.NULL_CORRECTION if date is outside covered range)

checkEOPContinuity

public void checkEOPContinuity(double maxGap)
                        throws OrekitException

Check Earth orientation parameters continuity.

Parameters:

maxGap - maximal allowed gap between entries (in seconds)

Throws:

OrekitException - if there are holes in the data sequence