FramesFactory.java
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*
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package org.orekit.frames;
import org.hipparchus.RealFieldElement;
import org.orekit.annotation.DefaultDataContext;
import org.orekit.data.DataContext;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.FieldAbsoluteDate;
import org.orekit.utils.IERSConventions;
/** Factory for predefined reference frames.
*
* <h2> FramesFactory Presentation </h2>
* <p>
* Several predefined reference {@link Frame frames} are implemented in OREKIT.
* They are linked together in a tree with the <i>Geocentric
* Celestial Reference Frame</i> (GCRF) as the root of the tree.
* This factory is designed to:
* </p>
* <ul>
* <li>build the frames tree consistently,</li>
* <li>avoid rebuilding some frames that may be costly to recreate all the time,</li>
* <li>set up interpolation/caching features for some frames that may induce costly computation</li>
* <li>streamline the {@link EOPHistory Earth Orientation Parameters} history loading.</li>
* </ul>
* <h2> Reference Frames </h2>
* <p>
* The user can retrieve those reference frames using various static methods, the most
* important ones being: {@link #getFrame(Predefined)}, {@link #getGCRF()},
* {@link #getCIRF(IERSConventions, boolean)} {@link #getTIRF(IERSConventions, boolean)},
* {@link #getITRF(IERSConventions, boolean)}, {@link #getITRF(ITRFVersion, IERSConventions, boolean)},
* {@link #getEME2000()}, {@link #getMOD(IERSConventions)}, {@link #getTOD(IERSConventions, boolean)},
* {@link #getGTOD(IERSConventions, boolean)}, {@link #getITRFEquinox(IERSConventions, boolean)},
* {@link #getTEME()} and {@link #getVeis1950()}.
* </p>
* <h2> International Terrestrial Reference Frame</h2>
* <p>
* This frame is the current (as of 2013) reference realization of
* the International Terrestrial Reference System produced by IERS.
* It is described in <a href="ftp://tai.bipm.org/iers/conv2010/tn36.pdf">
* IERS conventions (2010)</a>. It replaces the Earth Centered Earth Fixed
* frame which is the reference frame for GPS satellites.
* </p>
* <p>
* This frame is used to define position on solid Earth. It rotates with
* the Earth and includes the pole motion with respect to Earth crust as
* provided by IERS {@link EOPHistory Earth Orientation Parameters}.
* Its pole axis is the IERS Reference Pole (IRP).
* </p>
* <p>
* Depending on the {@link EOPHistory Earth Orientation Parameters} source,
* different ITRS realization may be returned by {@link #getITRF(IERSConventions, boolean)},
* and if EOP are mixed, the ITRF may even jump from one realization to another one.
* This is not a problem for most users as different ITRS realizations are very close
* to each other (a few millimeters at Earth surface). If however a specific ITRF version
* (i.e. an ITRS realization) is needed for very high accuracy, Orekit provides the
* {@link FramesFactory#getITRF(ITRFVersion, IERSConventions, boolean)} method
* to get it and take care of jumps in EOP.
* </p>
* <p>
* ITRF can be built using the new non-rotating origin paradigm
* mandated by IAU 2000 resolution B1.8 and any supported {@link IERSConventions
* IERS conventions} (even IERS 1996 can be used with non-rotating origin paradigm,
* despite the resolution was not yet adopted at conventions publication time).
* </p>
* <p>
* ITRF can also be built using the classical equinox paradigm used prior to IAU 2000
* resolution B1.8 and any supported {@link IERSConventions IERS conventions} (even
* IERS 2003 and 2010 can be used with equinox paradigm, despite the resolution is
* in effect now). The choice of paradigm (non-rotating origin or equinox) and the
* choice of IERS conventions (i.e. the choice of precession/nutation models) can
* be made independently by user, Orekit provides all alternatives.
* </p>
* <h2>Intermediate frames</h2>
* <p>
* Orekit also provides all the intermediate frames that are needed to transform
* between GCRF and ITRF, along the two paths: ITRF/TIRF/CIRF/GCRF for the
* non-rotating origin paradigm and ITRF/GTOD/TOD/MOD/EME2000/GCRF for the equinox
* paradigm.
* </p>
* <h2> Earth Orientation Parameters </h2>
* <p>
* This factory also handles loading of Earth Orientation Parameters (EOP) needed
* for accurate transformations between inertial and Earth fixed frames, using
* {@link org.orekit.data.DataProvidersManager} features. EOP are IERS conventions
* dependent, because they correspond to correction to the precession/nutation
* models. When EOP should be applied, but EOP data are not available, then a null
* (0.0) correction is used. This can occur when no EOP data is loaded, or when the
* requested date is beyond the time span of the loaded EOP data. Using a null
* correction can result in coarse accuracy. To check the time span covered by EOP data use
* {@link #getEOPHistory(IERSConventions, boolean)}, {@link EOPHistory#getStartDate()},
* and {@link EOPHistory#getEndDate()}.
* <p>
* For more information on configuring the EOP data Orekit uses see
* <a href="https://gitlab.orekit.org/orekit/orekit/blob/master/src/site/markdown/configuration.md">
* https://gitlab.orekit.org/orekit/orekit/blob/master/src/site/markdown/configuration.md</a>.
* <p>
* Here is a schematic representation of the predefined reference frames tree:
* </p>
* <pre>
* GCRF
* |
* |-----------------------------------------------
* | | Frame bias |
* | | EME2000
* | | |
* | | Precession effects |
* | | |
* Bias, Precession and Nutation effects | MOD MOD (Mean Equator Of Date)
* | | w/o EOP corrections
* | | Nutation effects |
* (Celestial Intermediate Reference Frame) CIRF | |
* | TOD TOD (True Equator Of Date)
* Earth natural rotation | | w/o EOP corrections
* |------------- | Sidereal Time |
* | | | |
* (Terrestrial Intermediate Reference Frame) TIRF TIRF GTOD GTOD (Greenwich True Of Date)
* | w/o tidal effects w/o EOP corrections
* Pole motion | | |
* | | |-------------
* | | | |
* (International Terrestrial Reference Frame) ITRF ITRF ITRF VEIS1950
* | w/o tidal effects equinox-based
* | |
* other ITRF other ITRF
* w/o tidal effects
* </pre>
* <p>
* This is a utility class, so its constructor is private.
* </p>
* @author Guylaine Prat
* @author Luc Maisonobe
* @author Pascal Parraud
* @see Frames
*/
public class FramesFactory {
/* These constants were left here instead of being moved to LazyLoadedFrames because
* they are public.
*/
/** Default regular expression for the Rapid Data and Prediction EOP columns files (IAU1980 compatibles). */
public static final String RAPID_DATA_PREDICTION_COLUMNS_1980_FILENAME = "^finals\\.[^.]*$";
/** Default regular expression for the Rapid Data and Prediction EOP XML files (IAU1980 compatibles). */
public static final String RAPID_DATA_PREDICTION_XML_1980_FILENAME = "^finals\\..*\\.xml$";
/** Default regular expression for the EOPC04 files (IAU1980 compatibles). */
public static final String EOPC04_1980_FILENAME = "^eopc04_\\d\\d\\.(\\d\\d)$";
/** Default regular expression for the BulletinB files (IAU1980 compatibles). */
public static final String BULLETINB_1980_FILENAME = "^bulletinb(_IAU1980)?((-\\d\\d\\d\\.txt)|(\\.\\d\\d\\d))$";
/** Default regular expression for the Rapid Data and Prediction EOP columns files (IAU2000 compatibles). */
public static final String RAPID_DATA_PREDICITON_COLUMNS_2000_FILENAME = "^finals2000A\\.[^.]*$";
/** Default regular expression for the Rapid Data and Prediction EOP XML files (IAU2000 compatibles). */
public static final String RAPID_DATA_PREDICITON_XML_2000_FILENAME = "^finals2000A\\..*\\.xml$";
/** Default regular expression for the EOPC04 files (IAU2000 compatibles). */
public static final String EOPC04_2000_FILENAME = "^eopc04_\\d\\d_IAU2000\\.(\\d\\d)$";
/** Default regular expression for the BulletinB files (IAU2000 compatibles). */
public static final String BULLETINB_2000_FILENAME = "^bulletinb(_IAU2000)?((-\\d\\d\\d\\.txt)|(\\.\\d\\d\\d))$";
/** Default regular expression for the BulletinA files (IAU1980 and IAU2000 compatibles). */
public static final String BULLETINA_FILENAME = "^bulletina-[ivxlcdm]+-\\d\\d\\d\\.txt$";
/** Private constructor.
* <p>This class is a utility class, it should neither have a public
* nor a default constructor. This private constructor prevents
* the compiler from generating one automatically.</p>
*/
private FramesFactory() {
}
/**
* Get the instance of {@link Frames} that is called by the static methods in this
* class.
*
* @return the reference frames used by this factory.
*/
@DefaultDataContext
public static LazyLoadedFrames getFrames() {
return DataContext.getDefault().getFrames();
}
/** Add the default loaders EOP history (IAU 1980 precession/nutation).
* <p>
* The default loaders look for IERS EOP C04 and bulletins B files. They
* correspond to {@link IERSConventions#IERS_1996 IERS 1996} conventions.
* </p>
* @param rapidDataColumnsSupportedNames regular expression for supported
* rapid data columns EOP files names
* (may be null if the default IERS file names are used)
* @param rapidDataXMLSupportedNames regular expression for supported
* rapid data XML EOP files names
* (may be null if the default IERS file names are used)
* @param eopC04SupportedNames regular expression for supported EOP C04 files names
* (may be null if the default IERS file names are used)
* @param bulletinBSupportedNames regular expression for supported bulletin B files names
* (may be null if the default IERS file names are used)
* @param bulletinASupportedNames regular expression for supported bulletin A files names
* (may be null if the default IERS file names are used)
* @see <a href="http://hpiers.obspm.fr/eoppc/eop/eopc04/">IERS EOP C04 files</a>
* @see #addEOPHistoryLoader(IERSConventions, EOPHistoryLoader)
* @see #clearEOPHistoryLoaders()
* @see #addDefaultEOP2000HistoryLoaders(String, String, String, String, String)
*/
@DefaultDataContext
public static void addDefaultEOP1980HistoryLoaders(final String rapidDataColumnsSupportedNames,
final String rapidDataXMLSupportedNames,
final String eopC04SupportedNames,
final String bulletinBSupportedNames,
final String bulletinASupportedNames) {
getFrames().addDefaultEOP1980HistoryLoaders(
rapidDataColumnsSupportedNames,
rapidDataXMLSupportedNames,
eopC04SupportedNames,
bulletinBSupportedNames,
bulletinASupportedNames);
}
/** Add the default loaders for EOP history (IAU 2000/2006 precession/nutation).
* <p>
* The default loaders look for IERS EOP C04 and bulletins B files. They
* correspond to both {@link IERSConventions#IERS_2003 IERS 2003} and {@link
* IERSConventions#IERS_2010 IERS 2010} conventions.
* </p>
* @param rapidDataColumnsSupportedNames regular expression for supported
* rapid data columns EOP files names
* (may be null if the default IERS file names are used)
* @param rapidDataXMLSupportedNames regular expression for supported
* rapid data XML EOP files names
* (may be null if the default IERS file names are used)
* @param eopC04SupportedNames regular expression for supported EOP C04 files names
* (may be null if the default IERS file names are used)
* @param bulletinBSupportedNames regular expression for supported bulletin B files names
* (may be null if the default IERS file names are used)
* @param bulletinASupportedNames regular expression for supported bulletin A files names
* (may be null if the default IERS file names are used)
* @see <a href="http://hpiers.obspm.fr/eoppc/eop/eopc04/">IERS EOP C04 files</a>
* @see #addEOPHistoryLoader(IERSConventions, EOPHistoryLoader)
* @see #clearEOPHistoryLoaders()
* @see #addDefaultEOP1980HistoryLoaders(String, String, String, String, String)
*/
@DefaultDataContext
public static void addDefaultEOP2000HistoryLoaders(final String rapidDataColumnsSupportedNames,
final String rapidDataXMLSupportedNames,
final String eopC04SupportedNames,
final String bulletinBSupportedNames,
final String bulletinASupportedNames) {
getFrames().addDefaultEOP2000HistoryLoaders(
rapidDataColumnsSupportedNames,
rapidDataXMLSupportedNames,
eopC04SupportedNames,
bulletinBSupportedNames,
bulletinASupportedNames);
}
/** Add a loader for Earth Orientation Parameters history.
* @param conventions IERS conventions to which EOP history applies
* @param loader custom loader to add for the EOP history
* @see #addDefaultEOP1980HistoryLoaders(String, String, String, String, String)
* @see #clearEOPHistoryLoaders()
*/
@DefaultDataContext
public static void addEOPHistoryLoader(final IERSConventions conventions, final EOPHistoryLoader loader) {
getFrames().addEOPHistoryLoader(conventions, loader);
}
/** Clear loaders for Earth Orientation Parameters history.
* @see #addEOPHistoryLoader(IERSConventions, EOPHistoryLoader)
* @see #addDefaultEOP1980HistoryLoaders(String, String, String, String, String)
*/
@DefaultDataContext
public static void clearEOPHistoryLoaders() {
getFrames().clearEOPHistoryLoaders();
}
/** Set the threshold to check EOP continuity.
* <p>
* The default threshold (used if this method is never called)
* is 5 Julian days. If after loading EOP entries some holes
* between entries exceed this threshold, an exception will
* be triggered.
* </p>
* <p>
* One case when calling this method is really useful is for
* applications that use a single Bulletin A, as these bulletins
* have a roughly one month wide hole for the first bulletin of
* each month, which contains older final data in addition to the
* rapid data and the predicted data.
* </p>
* @param threshold threshold to use for checking EOP continuity (in seconds)
*/
@DefaultDataContext
public static void setEOPContinuityThreshold(final double threshold) {
getFrames().setEOPContinuityThreshold(threshold);
}
/** Get Earth Orientation Parameters history.
* <p>
* If no {@link EOPHistoryLoader} has been added by calling {@link
* #addEOPHistoryLoader(IERSConventions, EOPHistoryLoader) addEOPHistoryLoader}
* or if {@link #clearEOPHistoryLoaders() clearEOPHistoryLoaders} has been
* called afterwards, the {@link #addDefaultEOP1980HistoryLoaders(String, String,
* String, String, String)} and {@link #addDefaultEOP2000HistoryLoaders(String,
* String, String, String, String)} methods will be called automatically with
* supported file names parameters all set to null, in order to get the default
* loaders configuration.
* </p>
* @param conventions conventions for which EOP history is requested
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return Earth Orientation Parameters history
*/
@DefaultDataContext
public static EOPHistory getEOPHistory(final IERSConventions conventions, final boolean simpleEOP) {
return getFrames().getEOPHistory(conventions, simpleEOP);
}
/** Get one of the predefined frames.
* @param factoryKey key of the frame within the factory
* @return the predefined frame
*/
@DefaultDataContext
public static Frame getFrame(final Predefined factoryKey) {
return getFrames().getFrame(factoryKey);
}
/** Get the unique GCRF frame.
* <p>The GCRF frame is the root frame in the frame tree.</p>
* @return the unique instance of the GCRF frame
*/
@DefaultDataContext
public static Frame getGCRF() {
return getFrames().getGCRF();
}
/** Get the unique ICRF frame.
* <p>The ICRF frame is centered at solar system barycenter and aligned
* with GCRF.</p>
* @return the unique instance of the ICRF frame
*/
@DefaultDataContext
public static Frame getICRF() {
return getFrames().getICRF();
}
/** Get the ecliptic frame.
* The IAU defines the ecliptic as "the plane perpendicular to the mean heliocentric
* orbital angular momentum vector of the Earth-Moon barycentre in the BCRS (IAU 2006
* Resolution B1)." The +z axis is aligned with the angular momentum vector, and the +x
* axis is aligned with +x axis of {@link FramesFactory#getMOD(IERSConventions) MOD}.
*
* <p> This implementation agrees with the JPL 406 ephemerides to within 0.5 arc seconds.
* @param conventions IERS conventions to apply
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static Frame getEcliptic(final IERSConventions conventions) {
return getFrames().getEcliptic(conventions);
}
/** Get the unique EME2000 frame.
* <p>The EME2000 frame is also called the J2000 frame.
* The former denomination is preferred in Orekit.</p>
* @return the unique instance of the EME2000 frame
*/
@DefaultDataContext
public static FactoryManagedFrame getEME2000() {
return getFrames().getEME2000();
}
/** Get an unspecified International Terrestrial Reference Frame.
* <p>
* The frame returned uses the {@link EOPEntry Earth Orientation Parameters}
* blindly. So if for example one loads only EOP 14 C04 files to retrieve
* the parameters, the frame will be an {@link ITRFVersion#ITRF_2014}. However,
* if parameters are loaded from different files types, or even for file
* types that changed their reference (like Bulletin A switching from
* {@link ITRFVersion#ITRF_2008} to {@link ITRFVersion#ITRF_2014} starting
* with Vol. XXXI No. 013 published on 2018-03-29), then the ITRF returned
* by this method will jump from one version to another version.
* </p>
* <p>
* IF a specific version of ITRF is needed, then {@link #getITRF(ITRFVersion,
* IERSConventions, boolean)} should be used instead.
* </p>
* @param conventions IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
* @see #getITRF(ITRFVersion, IERSConventions, boolean)
* @since 6.1
*/
@DefaultDataContext
public static FactoryManagedFrame getITRF(final IERSConventions conventions,
final boolean simpleEOP) {
return getFrames().getITRF(conventions, simpleEOP);
}
/** Get the TIRF reference frame, ignoring tidal effects.
* @param conventions IERS conventions to apply
* @return the selected reference frame singleton.
* library cannot be read.
*/
@DefaultDataContext
public static FactoryManagedFrame getTIRF(final IERSConventions conventions) {
return getFrames().getTIRF(conventions);
}
/** Get an specific International Terrestrial Reference Frame.
* <p>
* Note that if a specific version of ITRF is required, then {@code simpleEOP}
* should most probably be set to {@code false}, as ignoring tidal effects
* has an effect of the same order of magnitude as the differences between
* the various {@link ITRFVersion ITRF versions}.
* </p>
* @param version ITRF version
* @param conventions IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
* @since 9.2
*/
@DefaultDataContext
public static VersionedITRF getITRF(final ITRFVersion version,
final IERSConventions conventions,
final boolean simpleEOP) {
return getFrames().getITRF(version, conventions, simpleEOP);
}
/** Get the TIRF reference frame.
* @param conventions IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
* @since 6.1
*/
@DefaultDataContext
public static FactoryManagedFrame getTIRF(final IERSConventions conventions,
final boolean simpleEOP) {
return getFrames().getTIRF(conventions, simpleEOP);
}
/** Get the CIRF2000 reference frame.
* @param conventions IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getCIRF(final IERSConventions conventions,
final boolean simpleEOP) {
return getFrames().getCIRF(conventions, simpleEOP);
}
/** Get the VEIS 1950 reference frame.
* <p>Its parent frame is the GTOD frame with IERS 1996 conventions without EOP corrections.<p>
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getVeis1950() {
return getFrames().getVeis1950();
}
/** Get the equinox-based ITRF reference frame.
* @param conventions IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
* @since 6.1
*/
@DefaultDataContext
public static FactoryManagedFrame getITRFEquinox(final IERSConventions conventions,
final boolean simpleEOP) {
return getFrames().getITRFEquinox(conventions, simpleEOP);
}
/** Get the GTOD reference frame.
* <p>
* The applyEOPCorr parameter is available mainly for testing purposes or for
* consistency with legacy software that don't handle EOP correction parameters.
* Beware that setting this parameter to {@code false} leads to crude accuracy
* (order of magnitudes for errors might be above 250m in LEO and 1400m in GEO).
* For this reason, setting this parameter to false is restricted to {@link
* IERSConventions#IERS_1996 IERS 1996} conventions, and hence the {@link
* IERSConventions IERS conventions} cannot be freely chosen here.
* </p>
* @param applyEOPCorr if true, EOP corrections are applied (here, dut1 and lod)
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getGTOD(final boolean applyEOPCorr) {
return getFrames().getGTOD(applyEOPCorr);
}
/** Get the GTOD reference frame.
* @param conventions IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getGTOD(final IERSConventions conventions,
final boolean simpleEOP) {
return getFrames().getGTOD(conventions, simpleEOP);
}
/** Get the TOD reference frame.
* <p>
* The applyEOPCorr parameter is available mainly for testing purposes or for
* consistency with legacy software that don't handle EOP correction parameters.
* Beware that setting this parameter to {@code false} leads to crude accuracy
* (order of magnitudes for errors might be above 1m in LEO and 10m in GEO).
* For this reason, setting this parameter to false is restricted to {@link
* IERSConventions#IERS_1996 IERS 1996} conventions, and hence the {@link
* IERSConventions IERS conventions} cannot be freely chosen here.
* </p>
* @param applyEOPCorr if true, EOP corrections are applied (here, nutation)
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getTOD(final boolean applyEOPCorr) {
return getFrames().getTOD(applyEOPCorr);
}
/** Get the TOD reference frame.
* @param conventions IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getTOD(final IERSConventions conventions,
final boolean simpleEOP) {
return getFrames().getTOD(conventions, simpleEOP);
}
/** Get the MOD reference frame.
* <p>
* The applyEOPCorr parameter is available mainly for testing purposes or for
* consistency with legacy software that don't handle EOP correction parameters.
* Beware that setting this parameter to {@code false} leads to crude accuracy
* (order of magnitudes for errors might be above 1m in LEO and 10m in GEO).
* For this reason, setting this parameter to false is restricted to {@link
* IERSConventions#IERS_1996 IERS 1996} conventions, and hence the {@link
* IERSConventions IERS conventions} cannot be freely chosen here.
* </p>
* @param applyEOPCorr if true, EOP corrections are applied (EME2000/GCRF bias compensation)
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getMOD(final boolean applyEOPCorr) {
return getFrames().getMOD(applyEOPCorr);
}
/** Get the MOD reference frame.
* @param conventions IERS conventions to apply
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getMOD(final IERSConventions conventions) {
return getFrames().getMOD(conventions);
}
/** Get the TEME reference frame.
* <p>
* The TEME frame is used for the SGP4 model in TLE propagation. This frame has <em>no</em>
* official definition and there are some ambiguities about whether it should be used
* as "of date" or "of epoch". This frame should therefore be used <em>only</em> for
* TLE propagation and not for anything else, as recommended by the CCSDS Orbit Data Message
* blue book.
* </p>
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getTEME() {
return getFrames().getTEME();
}
/** Get the PZ-90.11 (Parametry Zemly – 1990.11) reference frame.
* <p>
* The PZ-90.11 reference system was updated on all operational
* GLONASS satellites starting from 3:00 pm on December 31, 2013.
* </p>
* <p>
* The transition between parent frame (ITRF-2008) and PZ-90.11 frame is performed using
* a seven parameters Helmert transformation.
* <pre>
* From To ΔX(m) ΔY(m) ΔZ(m) RX(mas) RY(mas) RZ(mas) Epoch
* ITRF-2008 PZ-90.11 +0.003 +0.001 -0.000 +0.019 -0.042 +0.002 2010
* </pre>
* @see "Springer Handbook of Global Navigation Satellite Systems, Peter Teunissen & Oliver Montenbruck"
*
* @param convention IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
*/
@DefaultDataContext
public static FactoryManagedFrame getPZ9011(final IERSConventions convention,
final boolean simpleEOP) {
return getFrames().getPZ9011(convention, simpleEOP);
}
/** Get the transform between two frames, suppressing all interpolation.
* <p>
* This method is similar to {@link Frame#getTransformTo(Frame, AbsoluteDate)}
* except it removes the performance enhancing interpolation features that are
* added by the {@link FramesFactory factory} to some frames, in order to focus
* on accuracy. The interpolation features are intended to save processing time
* by avoiding doing some lengthy computation like nutation evaluation at each
* time step and caching some results. This method can be used to avoid this,
* when very high accuracy is desired, or for testing purposes. It should be
* used with care, as doing the full computation is <em>really</em> costly for
* some frames.
* </p>
* @param from frame from which transformation starts
* @param to frame to which transformation ends
* @param date date of the transform
* @return transform between the two frames, avoiding interpolation
*/
public static Transform getNonInterpolatingTransform(final Frame from, final Frame to,
final AbsoluteDate date) {
// common ancestor to both frames in the frames tree
Frame currentF = from.getDepth() > to.getDepth() ? from.getAncestor(from.getDepth() - to.getDepth()) : from;
Frame currentT = from.getDepth() > to.getDepth() ? to : to.getAncestor(to.getDepth() - from.getDepth());
while (currentF != currentT) {
currentF = currentF.getParent();
currentT = currentT.getParent();
}
final Frame common = currentF;
// transform from common to origin
Transform commonToOrigin = Transform.IDENTITY;
for (Frame frame = from; frame != common; frame = frame.getParent()) {
commonToOrigin = new Transform(date,
peel(frame.getTransformProvider()).getTransform(date),
commonToOrigin);
}
// transform from destination up to common
Transform commonToDestination = Transform.IDENTITY;
for (Frame frame = to; frame != common; frame = frame.getParent()) {
commonToDestination = new Transform(date,
peel(frame.getTransformProvider()).getTransform(date),
commonToDestination);
}
// transform from origin to destination via common
return new Transform(date, commonToOrigin.getInverse(), commonToDestination);
}
/* The methods below are static helper methods for Frame and TransformProvider. */
/** Get the transform between two frames, suppressing all interpolation.
* <p>
* This method is similar to {@link Frame#getTransformTo(Frame, AbsoluteDate)}
* except it removes the performance enhancing interpolation features that are
* added by the {@link FramesFactory factory} to some frames, in order to focus
* on accuracy. The interpolation features are intended to save processing time
* by avoiding doing some lengthy computation like nutation evaluation at each
* time step and caching some results. This method can be used to avoid this,
* when very high accuracy is desired, or for testing purposes. It should be
* used with care, as doing the full computation is <em>really</em> costly for
* some frames.
* </p>
* @param from frame from which transformation starts
* @param to frame to which transformation ends
* @param date date of the transform
* @param <T> type of the field elements
* @return transform between the two frames, avoiding interpolation
* @since 9.0
*/
public static <T extends RealFieldElement<T>> FieldTransform<T> getNonInterpolatingTransform(final Frame from, final Frame to,
final FieldAbsoluteDate<T> date) {
// common ancestor to both frames in the frames tree
Frame currentF = from.getDepth() > to.getDepth() ? from.getAncestor(from.getDepth() - to.getDepth()) : from;
Frame currentT = from.getDepth() > to.getDepth() ? to : to.getAncestor(to.getDepth() - from.getDepth());
while (currentF != currentT) {
currentF = currentF.getParent();
currentT = currentT.getParent();
}
final Frame common = currentF;
// transform from common to origin
FieldTransform<T> commonToOrigin = FieldTransform.getIdentity(date.getField());
for (Frame frame = from; frame != common; frame = frame.getParent()) {
commonToOrigin = new FieldTransform<>(date,
peel(frame.getTransformProvider()).getTransform(date),
commonToOrigin);
}
// transform from destination up to common
FieldTransform<T> commonToDestination = FieldTransform.getIdentity(date.getField());
for (Frame frame = to; frame != common; frame = frame.getParent()) {
commonToDestination = new FieldTransform<>(date,
peel(frame.getTransformProvider()).getTransform(date),
commonToDestination);
}
// transform from origin to destination via common
return new FieldTransform<>(date, commonToOrigin.getInverse(), commonToDestination);
}
/** Retrieve EOP from a frame hierarchy.
* <p>
* The frame hierarchy tree is walked from specified frame up to root
* goind though parent frames, and the providers are checked to see if they
* reference EOP history.the first EOP history found is returned.
* </p>
* @param start frame from which to start search, will typically be some
* Earth related frame, like a topocentric frame or an ITRF frame
* @return EOP history found while walking the frames tree, or null if
* no EOP history is found
* @since 9.1
*/
public static EOPHistory findEOP(final Frame start) {
for (Frame frame = start; frame != null; frame = frame.getParent()) {
TransformProvider peeled = frame.getTransformProvider();
boolean peeling = true;
while (peeling) {
if (peeled instanceof InterpolatingTransformProvider) {
peeled = ((InterpolatingTransformProvider) peeled).getRawProvider();
} else if (peeled instanceof ShiftingTransformProvider) {
peeled = ((ShiftingTransformProvider) peeled).getRawProvider();
} else if (peeled instanceof EOPBasedTransformProvider &&
((EOPBasedTransformProvider) peeled).getEOPHistory() != null) {
return ((EOPBasedTransformProvider) peeled).getEOPHistory();
} else {
peeling = false;
}
}
}
// no history found
return null;
}
/** Peel interpolation and shifting from a transform provider.
* @param provider transform provider to peel
* @return peeled transform provider
*/
private static TransformProvider peel(final TransformProvider provider) {
TransformProvider peeled = provider;
boolean peeling = true;
while (peeling) {
if (peeled instanceof InterpolatingTransformProvider) {
peeled = ((InterpolatingTransformProvider) peeled).getRawProvider();
} else if (peeled instanceof ShiftingTransformProvider) {
peeled = ((ShiftingTransformProvider) peeled).getRawProvider();
} else if (peeled instanceof EOPBasedTransformProvider &&
((EOPBasedTransformProvider) peeled).getEOPHistory() != null &&
((EOPBasedTransformProvider) peeled).getEOPHistory().usesInterpolation()) {
peeled = ((EOPBasedTransformProvider) peeled).getNonInterpolatingProvider();
} else {
peeling = false;
}
}
return peeled;
}
}