org.orekit.frames
Class AbstractEOPHistory

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

All Implemented Interfaces:

java.io.Serializable, java.lang.Iterable<TimeStamped>, EOPHistory

Direct Known Subclasses:

EOP1980History, EOP2000History

public abstract class AbstractEOPHistory
extends java.lang.Object
implements java.io.Serializable, EOPHistory

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

Version:

$Revision: 3115 $ $Date: 2010-02-11 16:29:18 +0100 (jeu. 11 févr. 2010) $

Author:

Pascal Parraud

See Also:

Serialized Form

Field Summary

protected double	dtN Offset to next date.
protected double	dtP Offset from previous date.
protected java.util.SortedSet<TimeStamped>	entries EOP history entries.
protected EOPEntry	next Next EOP entry.
protected EOPEntry	previous Previous EOP entry.

Constructor Summary

protected

AbstractEOPHistory() Simple constructor.

Method Summary

void	checkEOPContinuity(double maxGap) Check Earth orientation parameters continuity.
AbsoluteDate	getEndDate() Get the date of the last available Earth Orientation Parameters.
double	getLOD(AbsoluteDate date) Get the LoD (Length of Day) value.
AbsoluteDate	getStartDate() Get the date of the first available Earth Orientation Parameters.
double	getUT1MinusUTC(AbsoluteDate date) Get the UT1-UTC value.
java.util.Iterator<TimeStamped>	iterator()
protected boolean	prepareInterpolation(AbsoluteDate date) Prepare interpolation between two entries.
protected boolean	selectBracketingEntries(AbsoluteDate date) Select the entries bracketing a specified date.

Methods inherited from class java.lang.Object

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

Field Detail

entries

protected final java.util.SortedSet<TimeStamped> entries

EOP history entries.

previous

protected EOPEntry previous

Previous EOP entry.

next

protected EOPEntry next

Next EOP entry.

dtP

protected double dtP

Offset from previous date.

dtN

protected double dtN

Offset to next date.

Constructor Detail

AbstractEOPHistory

protected AbstractEOPHistory()

Simple constructor.

Method Detail

iterator

public java.util.Iterator<TimeStamped> iterator()

Specified by:

iterator in interface java.lang.Iterable<TimeStamped>

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)

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)

prepareInterpolation

protected boolean prepareInterpolation(AbsoluteDate date)

Prepare interpolation between two entries.

Parameters:

date - target date

Returns:

true if there are entries bracketing the target date

selectBracketingEntries

protected boolean selectBracketingEntries(AbsoluteDate date)

Select the entries bracketing a specified date.

If the date is either before the first entry or after the last entry, previous and next will be set to null.

Parameters:

date - target date

Returns:

true if the date was found in the tables

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