FramesFactory.java
/* Copyright 2002-2016 CS Systèmes d'Information
* Licensed to CS Systèmes d'Information (CS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* CS licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.orekit.frames;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.SortedSet;
import java.util.TreeSet;
import org.orekit.bodies.CelestialBodyFactory;
import org.orekit.errors.OrekitException;
import org.orekit.errors.OrekitInternalError;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.ChronologicalComparator;
import org.orekit.utils.AngularDerivativesFilter;
import org.orekit.utils.CartesianDerivativesFilter;
import org.orekit.utils.Constants;
import org.orekit.utils.IERSConventions;
import org.orekit.utils.OrekitConfiguration;
/** Factory for predefined reference frames.
*
* <h1> FramesFactory Presentation </h1>
* <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 #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 {@link org.orekit.data.DataProvidersManager IERS data}.
* Its pole axis is the IERS Reference Pole (IRP).
* </p>
* <p>
* Previous realizations of the ITRS are available and linked together using
* {@link HelmertTransformation Helmert transformations}. Parameters for all
* ITRS realizations since 1988 are available from the ITRF site <a
* href="ftp://itrf.ensg.ign.fr/pub/itrf/ITRF.TP"> ftp://itrf.ensg.ign.fr/pub/itrf/ITRF.TP</a>).
* Orekit provides a {@link HelmertTransformation.Predefined#createTransformedITRF(Frame,
* String) utility} method to build simply several of them and link them together.
* </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 on configuring the EOP data Orekit uses see
* <a href="https://www.orekit.org/forge/projects/orekit/wiki/Configuration">
* https://www.orekit.org/forge/projects/orekit/wiki/Configuration</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
*/
public class FramesFactory {
/** 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_08\\.(\\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_08_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$";
/** Predefined frames. */
private static transient Map<Predefined, FactoryManagedFrame> FRAMES =
new HashMap<Predefined, FactoryManagedFrame>();
/** Loaders for Earth Orientation parameters. */
private static final Map<IERSConventions, List<EOPHistoryLoader>> EOP_HISTORY_LOADERS =
new HashMap<IERSConventions, List<EOPHistoryLoader>>();
/** Threshold for EOP continuity. */
private static double EOP_CONTINUITY_THRESHOLD = 5 * Constants.JULIAN_DAY;
/** 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() {
}
/** Add the default loaders EOP history (IAU 1980 precession/nutation).
* <p>
* The default loaders look for IERS EOP 08 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 08 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 08 C04 files</a>
* @see #addEOPHistoryLoader(IERSConventions, EOPHistoryLoader)
* @see #clearEOPHistoryLoaders()
* @see #addDefaultEOP2000HistoryLoaders(String, String, String, String, String)
*/
public static void addDefaultEOP1980HistoryLoaders(final String rapidDataColumnsSupportedNames,
final String rapidDataXMLSupportedNames,
final String eopC04SupportedNames,
final String bulletinBSupportedNames,
final String bulletinASupportedNames) {
final String rapidColNames =
(rapidDataColumnsSupportedNames == null) ?
RAPID_DATA_PREDICTION_COLUMNS_1980_FILENAME : rapidDataColumnsSupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_1996,
new RapidDataAndPredictionColumnsLoader(false, rapidColNames));
final String rapidXmlNames =
(rapidDataXMLSupportedNames == null) ?
RAPID_DATA_PREDICTION_XML_1980_FILENAME : rapidDataXMLSupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_1996,
new RapidDataAndPredictionXMLLoader(rapidXmlNames));
final String eopcNames =
(eopC04SupportedNames == null) ? EOPC04_1980_FILENAME : eopC04SupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_1996,
new EOP08C04FilesLoader(eopcNames));
final String bulBNames =
(bulletinBSupportedNames == null) ? BULLETINB_1980_FILENAME : bulletinBSupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_1996,
new BulletinBFilesLoader(bulBNames));
final String bulANames =
(bulletinASupportedNames == null) ? BULLETINA_FILENAME : bulletinASupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_1996,
new BulletinAFilesLoader(bulANames));
}
/** Add the default loaders for EOP history (IAU 2000/2006 precession/nutation).
* <p>
* The default loaders look for IERS EOP 08 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 08 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 08 C04 files</a>
* @see #addEOPHistoryLoader(IERSConventions, EOPHistoryLoader)
* @see #clearEOPHistoryLoaders()
* @see #addDefaultEOP1980HistoryLoaders(String, String, String, String, String)
*/
public static void addDefaultEOP2000HistoryLoaders(final String rapidDataColumnsSupportedNames,
final String rapidDataXMLSupportedNames,
final String eopC04SupportedNames,
final String bulletinBSupportedNames,
final String bulletinASupportedNames) {
final String rapidColNames =
(rapidDataColumnsSupportedNames == null) ?
RAPID_DATA_PREDICITON_COLUMNS_2000_FILENAME : rapidDataColumnsSupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_2003,
new RapidDataAndPredictionColumnsLoader(true, rapidColNames));
addEOPHistoryLoader(IERSConventions.IERS_2010,
new RapidDataAndPredictionColumnsLoader(true, rapidColNames));
final String rapidXmlNames =
(rapidDataXMLSupportedNames == null) ?
RAPID_DATA_PREDICITON_XML_2000_FILENAME : rapidDataXMLSupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_2003,
new RapidDataAndPredictionXMLLoader(rapidXmlNames));
addEOPHistoryLoader(IERSConventions.IERS_2010,
new RapidDataAndPredictionXMLLoader(rapidXmlNames));
final String eopcNames =
(eopC04SupportedNames == null) ? EOPC04_2000_FILENAME : eopC04SupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_2003,
new EOP08C04FilesLoader(eopcNames));
addEOPHistoryLoader(IERSConventions.IERS_2010,
new EOP08C04FilesLoader(eopcNames));
final String bulBNames =
(bulletinBSupportedNames == null) ? BULLETINB_2000_FILENAME : bulletinBSupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_2003,
new BulletinBFilesLoader(bulBNames));
addEOPHistoryLoader(IERSConventions.IERS_2010,
new BulletinBFilesLoader(bulBNames));
final String bulANames =
(bulletinASupportedNames == null) ? BULLETINA_FILENAME : bulletinASupportedNames;
addEOPHistoryLoader(IERSConventions.IERS_2003,
new BulletinAFilesLoader(bulANames));
addEOPHistoryLoader(IERSConventions.IERS_2010,
new BulletinAFilesLoader(bulANames));
}
/** 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()
*/
public static void addEOPHistoryLoader(final IERSConventions conventions, final EOPHistoryLoader loader) {
synchronized (EOP_HISTORY_LOADERS) {
if (!EOP_HISTORY_LOADERS.containsKey(conventions)) {
EOP_HISTORY_LOADERS.put(conventions, new ArrayList<EOPHistoryLoader>());
}
EOP_HISTORY_LOADERS.get(conventions).add(loader);
}
}
/** Clear loaders for Earth Orientation Parameters history.
* @see #addEOPHistoryLoader(IERSConventions, EOPHistoryLoader)
* @see #addDefaultEOP1980HistoryLoaders(String, String, String, String, String)
*/
public static void clearEOPHistoryLoaders() {
synchronized (EOP_HISTORY_LOADERS) {
EOP_HISTORY_LOADERS.clear();
}
}
/** 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)
*/
public static void setEOPContinuityThreshold(final double threshold) {
EOP_CONTINUITY_THRESHOLD = 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
* @exception OrekitException if the data cannot be loaded
*/
public static EOPHistory getEOPHistory(final IERSConventions conventions, final boolean simpleEOP)
throws OrekitException {
synchronized (EOP_HISTORY_LOADERS) {
if (EOP_HISTORY_LOADERS.isEmpty()) {
// set up using default loaders
addDefaultEOP2000HistoryLoaders(null, null, null, null, null);
addDefaultEOP1980HistoryLoaders(null, null, null, null, null);
}
// TimeStamped based set needed to remove duplicates
OrekitException pendingException = null;
final SortedSet<EOPEntry> data = new TreeSet<EOPEntry>(new ChronologicalComparator());
// try to load canonical data if available
if (EOP_HISTORY_LOADERS.containsKey(conventions)) {
for (final EOPHistoryLoader loader : EOP_HISTORY_LOADERS.get(conventions)) {
try {
loader.fillHistory(conventions.getNutationCorrectionConverter(), data);
} catch (OrekitException oe) {
pendingException = oe;
}
}
}
if (data.isEmpty() && pendingException != null) {
throw pendingException;
}
final EOPHistory history = new EOPHistory(conventions, data, simpleEOP);
history.checkEOPContinuity(EOP_CONTINUITY_THRESHOLD);
return history;
}
}
/** Get one of the predefined frames.
* @param factoryKey key of the frame within the factory
* @return the predefined frame
* @exception OrekitException if frame cannot be built due to missing data
*/
public static Frame getFrame(final Predefined factoryKey)
throws OrekitException {
switch (factoryKey) {
case GCRF :
return getGCRF();
case ICRF :
return getICRF();
case ECLIPTIC_CONVENTIONS_1996 :
return getEcliptic(IERSConventions.IERS_1996);
case ECLIPTIC_CONVENTIONS_2003 :
return getEcliptic(IERSConventions.IERS_2003);
case ECLIPTIC_CONVENTIONS_2010 :
return getEcliptic(IERSConventions.IERS_2010);
case EME2000 :
return getEME2000();
case ITRF_CIO_CONV_2010_SIMPLE_EOP :
return getITRF(IERSConventions.IERS_2010, true);
case ITRF_CIO_CONV_2010_ACCURATE_EOP :
return getITRF(IERSConventions.IERS_2010, false);
case ITRF_CIO_CONV_2003_SIMPLE_EOP :
return getITRF(IERSConventions.IERS_2003, true);
case ITRF_CIO_CONV_2003_ACCURATE_EOP :
return getITRF(IERSConventions.IERS_2003, false);
case ITRF_CIO_CONV_1996_SIMPLE_EOP :
return getITRF(IERSConventions.IERS_1996, true);
case ITRF_CIO_CONV_1996_ACCURATE_EOP :
return getITRF(IERSConventions.IERS_1996, false);
case ITRF_EQUINOX_CONV_2010_SIMPLE_EOP :
return getITRFEquinox(IERSConventions.IERS_2010, true);
case ITRF_EQUINOX_CONV_2010_ACCURATE_EOP :
return getITRFEquinox(IERSConventions.IERS_2010, false);
case ITRF_EQUINOX_CONV_2003_SIMPLE_EOP :
return getITRFEquinox(IERSConventions.IERS_2003, true);
case ITRF_EQUINOX_CONV_2003_ACCURATE_EOP :
return getITRFEquinox(IERSConventions.IERS_2003, false);
case ITRF_EQUINOX_CONV_1996_SIMPLE_EOP :
return getITRFEquinox(IERSConventions.IERS_1996, true);
case ITRF_EQUINOX_CONV_1996_ACCURATE_EOP :
return getITRFEquinox(IERSConventions.IERS_1996, false);
case TIRF_CONVENTIONS_2010_SIMPLE_EOP :
return getTIRF(IERSConventions.IERS_2010, true);
case TIRF_CONVENTIONS_2010_ACCURATE_EOP :
return getTIRF(IERSConventions.IERS_2010, false);
case TIRF_CONVENTIONS_2003_SIMPLE_EOP :
return getTIRF(IERSConventions.IERS_2003, true);
case TIRF_CONVENTIONS_2003_ACCURATE_EOP :
return getTIRF(IERSConventions.IERS_2003, false);
case TIRF_CONVENTIONS_1996_SIMPLE_EOP :
return getTIRF(IERSConventions.IERS_1996, true);
case TIRF_CONVENTIONS_1996_ACCURATE_EOP :
return getTIRF(IERSConventions.IERS_1996, false);
case CIRF_CONVENTIONS_2010_ACCURATE_EOP :
return getCIRF(IERSConventions.IERS_2010, false);
case CIRF_CONVENTIONS_2010_SIMPLE_EOP :
return getCIRF(IERSConventions.IERS_2010, true);
case CIRF_CONVENTIONS_2003_ACCURATE_EOP :
return getCIRF(IERSConventions.IERS_2003, false);
case CIRF_CONVENTIONS_2003_SIMPLE_EOP :
return getCIRF(IERSConventions.IERS_2003, true);
case CIRF_CONVENTIONS_1996_ACCURATE_EOP :
return getCIRF(IERSConventions.IERS_1996, false);
case CIRF_CONVENTIONS_1996_SIMPLE_EOP :
return getCIRF(IERSConventions.IERS_1996, true);
case VEIS_1950 :
return getVeis1950();
case GTOD_WITHOUT_EOP_CORRECTIONS :
return getGTOD(IERSConventions.IERS_1996, false, true);
case GTOD_CONVENTIONS_2010_ACCURATE_EOP :
return getGTOD(IERSConventions.IERS_2010, true, false);
case GTOD_CONVENTIONS_2010_SIMPLE_EOP :
return getGTOD(IERSConventions.IERS_2010, true, true);
case GTOD_CONVENTIONS_2003_ACCURATE_EOP :
return getGTOD(IERSConventions.IERS_2003, true, false);
case GTOD_CONVENTIONS_2003_SIMPLE_EOP :
return getGTOD(IERSConventions.IERS_2003, true, true);
case GTOD_CONVENTIONS_1996_ACCURATE_EOP :
return getGTOD(IERSConventions.IERS_1996, true, false);
case GTOD_CONVENTIONS_1996_SIMPLE_EOP :
return getGTOD(IERSConventions.IERS_1996, true, true);
case TOD_WITHOUT_EOP_CORRECTIONS :
return getTOD(IERSConventions.IERS_1996, false, true);
case TOD_CONVENTIONS_2010_ACCURATE_EOP :
return getTOD(IERSConventions.IERS_2010, true, false);
case TOD_CONVENTIONS_2010_SIMPLE_EOP :
return getTOD(IERSConventions.IERS_2010, true, true);
case TOD_CONVENTIONS_2003_ACCURATE_EOP :
return getTOD(IERSConventions.IERS_2003, true, false);
case TOD_CONVENTIONS_2003_SIMPLE_EOP :
return getTOD(IERSConventions.IERS_2003, true, true);
case TOD_CONVENTIONS_1996_ACCURATE_EOP :
return getTOD(IERSConventions.IERS_1996, true, false);
case TOD_CONVENTIONS_1996_SIMPLE_EOP :
return getTOD(IERSConventions.IERS_1996, true, true);
case MOD_WITHOUT_EOP_CORRECTIONS :
return getMOD(IERSConventions.IERS_1996, false);
case MOD_CONVENTIONS_2010 :
return getMOD(IERSConventions.IERS_2010, true);
case MOD_CONVENTIONS_2003 :
return getMOD(IERSConventions.IERS_2003, true);
case MOD_CONVENTIONS_1996 :
return getMOD(IERSConventions.IERS_1996, true);
case TEME :
return getTEME();
default :
// this should never happen
throw new OrekitInternalError(null);
}
}
/** 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
*/
public static Frame getGCRF() {
return Frame.getRoot();
}
/** Get the unique ICRF frame.
* <p>The ICRF frame is centered at solar system barycenter and aligned
* with EME2000.</p>
* @return the unique instance of the ICRF frame
* @exception OrekitException if solar system ephemerides cannot be loaded
*/
public static Frame getICRF() throws OrekitException {
return CelestialBodyFactory.getSolarSystemBarycenter().getInertiallyOrientedFrame();
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static Frame getEcliptic(final IERSConventions conventions) throws OrekitException {
synchronized (FramesFactory.class) {
final Predefined factoryKey;
switch (conventions) {
case IERS_1996 :
factoryKey = Predefined.ECLIPTIC_CONVENTIONS_1996;
break;
case IERS_2003 :
factoryKey = Predefined.ECLIPTIC_CONVENTIONS_2003;
break;
case IERS_2010 :
factoryKey = Predefined.ECLIPTIC_CONVENTIONS_2010;
break;
default :
// this should never happen
throw new OrekitInternalError(null);
}
final Frame parent = getMOD(conventions);
// try to find an already built frame
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
frame = new FactoryManagedFrame(parent, new EclipticProvider(conventions),
true, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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
*/
public static FactoryManagedFrame getEME2000() {
synchronized (FramesFactory.class) {
// try to find an already built frame
FactoryManagedFrame frame = FRAMES.get(Predefined.EME2000);
if (frame == null) {
// it's the first time we need this frame, build it and store it
frame = new FactoryManagedFrame(getGCRF(), new EME2000Provider(), true, Predefined.EME2000);
FRAMES.put(Predefined.EME2000, frame);
}
return frame;
}
}
/** Get the ITRF2008 reference frame, using IERS 2010 conventions.
* @param conventions IERS conventions to apply
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
* @exception OrekitException if data embedded in the library cannot be read
* @since 6.1
*/
public static FactoryManagedFrame getITRF(final IERSConventions conventions,
final boolean simpleEOP)
throws OrekitException {
synchronized (FramesFactory.class) {
// try to find an already built frame
final Predefined factoryKey;
switch (conventions) {
case IERS_1996 :
factoryKey = simpleEOP ?
Predefined.ITRF_CIO_CONV_1996_SIMPLE_EOP :
Predefined.ITRF_CIO_CONV_1996_ACCURATE_EOP;
break;
case IERS_2003 :
factoryKey = simpleEOP ?
Predefined.ITRF_CIO_CONV_2003_SIMPLE_EOP :
Predefined.ITRF_CIO_CONV_2003_ACCURATE_EOP;
break;
case IERS_2010 :
factoryKey = simpleEOP ?
Predefined.ITRF_CIO_CONV_2010_SIMPLE_EOP :
Predefined.ITRF_CIO_CONV_2010_ACCURATE_EOP;
break;
default :
// this should never happen
throw new OrekitInternalError(null);
}
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
final Frame tirfFrame = getTIRF(conventions, simpleEOP);
final TIRFProvider tirfProvider = (TIRFProvider) tirfFrame.getTransformProvider();
frame = new FactoryManagedFrame(tirfFrame,
new ITRFProvider(tirfProvider.getEOPHistory()),
false, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** Get the TIRF reference frame, ignoring tidal effects.
* @param conventions IERS conventions to apply
* @return the selected reference frame singleton.
* @exception OrekitException if the precession-nutation model data embedded in the
* library cannot be read.
*/
public static FactoryManagedFrame getTIRF(final IERSConventions conventions) throws OrekitException {
return getTIRF(conventions, true);
}
/** 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.
* @exception OrekitException if the precession-nutation model data embedded in the
* library cannot be read.
* @since 6.1
*/
public static FactoryManagedFrame getTIRF(final IERSConventions conventions,
final boolean simpleEOP)
throws OrekitException {
synchronized (FramesFactory.class) {
// try to find an already built frame
final Predefined factoryKey;
switch (conventions) {
case IERS_1996 :
factoryKey = simpleEOP ?
Predefined.TIRF_CONVENTIONS_1996_SIMPLE_EOP :
Predefined.TIRF_CONVENTIONS_1996_ACCURATE_EOP;
break;
case IERS_2003 :
factoryKey = simpleEOP ?
Predefined.TIRF_CONVENTIONS_2003_SIMPLE_EOP :
Predefined.TIRF_CONVENTIONS_2003_ACCURATE_EOP;
break;
case IERS_2010 :
factoryKey = simpleEOP ?
Predefined.TIRF_CONVENTIONS_2010_SIMPLE_EOP :
Predefined.TIRF_CONVENTIONS_2010_ACCURATE_EOP;
break;
default :
// this should never happen
throw new OrekitInternalError(null);
}
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
final Frame cirf = getCIRF(conventions, simpleEOP);
final ShiftingTransformProvider cirfInterpolating =
(ShiftingTransformProvider) cirf.getTransformProvider();
final CIRFProvider cirfRaw = (CIRFProvider) cirfInterpolating.getRawProvider();
final EOPHistory eopHistory = cirfRaw.getEOPHistory();
frame = new FactoryManagedFrame(cirf, new TIRFProvider(eopHistory), false, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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.
* @exception OrekitException if the precession-nutation model data embedded in the
* library cannot be read.
*/
public static FactoryManagedFrame getCIRF(final IERSConventions conventions,
final boolean simpleEOP)
throws OrekitException {
synchronized (FramesFactory.class) {
// try to find an already built frame
final Predefined factoryKey;
switch (conventions) {
case IERS_1996 :
factoryKey = simpleEOP ?
Predefined.CIRF_CONVENTIONS_1996_SIMPLE_EOP :
Predefined.CIRF_CONVENTIONS_1996_ACCURATE_EOP;
break;
case IERS_2003 :
factoryKey = simpleEOP ?
Predefined.CIRF_CONVENTIONS_2003_SIMPLE_EOP :
Predefined.CIRF_CONVENTIONS_2003_ACCURATE_EOP;
break;
case IERS_2010 :
factoryKey = simpleEOP ?
Predefined.CIRF_CONVENTIONS_2010_SIMPLE_EOP :
Predefined.CIRF_CONVENTIONS_2010_ACCURATE_EOP;
break;
default :
// this should never happen
throw new OrekitInternalError(null);
}
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
final EOPHistory eopHistory = FramesFactory.getEOPHistory(conventions, simpleEOP);
final TransformProvider shifting =
new ShiftingTransformProvider(new CIRFProvider(eopHistory),
CartesianDerivativesFilter.USE_PVA,
AngularDerivativesFilter.USE_R,
AbsoluteDate.PAST_INFINITY, AbsoluteDate.FUTURE_INFINITY,
6, Constants.JULIAN_DAY / 24,
OrekitConfiguration.getCacheSlotsNumber(),
Constants.JULIAN_YEAR, 30 * Constants.JULIAN_DAY);
frame = new FactoryManagedFrame(getGCRF(), shifting, true, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static FactoryManagedFrame getVeis1950() throws OrekitException {
synchronized (FramesFactory.class) {
// try to find an already built frame
final Predefined factoryKey = Predefined.VEIS_1950;
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
frame = new FactoryManagedFrame(FramesFactory.getGTOD(IERSConventions.IERS_1996, false, true),
new VEISProvider(), true, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
* @since 6.1
*/
public static FactoryManagedFrame getITRFEquinox(final IERSConventions conventions,
final boolean simpleEOP)
throws OrekitException {
synchronized (FramesFactory.class) {
// try to find an already built frame
final Predefined factoryKey;
switch (conventions) {
case IERS_1996 :
factoryKey = simpleEOP ?
Predefined.ITRF_EQUINOX_CONV_1996_SIMPLE_EOP :
Predefined.ITRF_EQUINOX_CONV_1996_ACCURATE_EOP;
break;
case IERS_2003 :
factoryKey = simpleEOP ?
Predefined.ITRF_EQUINOX_CONV_2003_SIMPLE_EOP :
Predefined.ITRF_EQUINOX_CONV_2003_ACCURATE_EOP;
break;
case IERS_2010 :
factoryKey = simpleEOP ?
Predefined.ITRF_EQUINOX_CONV_2010_SIMPLE_EOP :
Predefined.ITRF_EQUINOX_CONV_2010_ACCURATE_EOP;
break;
default :
// this should never happen
throw new OrekitInternalError(null);
}
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
final Frame gtod = getGTOD(conventions, true, simpleEOP);
final ShiftingTransformProvider gtodShifting =
(ShiftingTransformProvider) gtod.getTransformProvider();
final GTODProvider gtodRaw = (GTODProvider) gtodShifting.getRawProvider();
final EOPHistory eopHistory = gtodRaw.getEOPHistory();
frame = new FactoryManagedFrame(gtod, new ITRFProvider(eopHistory), false, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static FactoryManagedFrame getGTOD(final boolean applyEOPCorr) throws OrekitException {
return getGTOD(IERSConventions.IERS_1996, applyEOPCorr, true);
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static FactoryManagedFrame getGTOD(final IERSConventions conventions,
final boolean simpleEOP)
throws OrekitException {
return getGTOD(conventions, true, 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 this method is private.
* </p>
* @param conventions IERS conventions to apply
* @param applyEOPCorr if true, EOP corrections are applied (here, dut1 and lod)
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
* @exception OrekitException if data embedded in the library cannot be read
*/
private static FactoryManagedFrame getGTOD(final IERSConventions conventions,
final boolean applyEOPCorr,
final boolean simpleEOP)
throws OrekitException {
synchronized (FramesFactory.class) {
// try to find an already built frame
final Predefined factoryKey;
switch (conventions) {
case IERS_1996 :
factoryKey = applyEOPCorr ?
(simpleEOP ? Predefined.GTOD_CONVENTIONS_1996_SIMPLE_EOP : Predefined.GTOD_CONVENTIONS_1996_ACCURATE_EOP) :
Predefined.GTOD_WITHOUT_EOP_CORRECTIONS;
break;
case IERS_2003 :
factoryKey = simpleEOP ?
Predefined.GTOD_CONVENTIONS_2003_SIMPLE_EOP :
Predefined.GTOD_CONVENTIONS_2003_ACCURATE_EOP;
break;
case IERS_2010 :
factoryKey = simpleEOP ? Predefined.GTOD_CONVENTIONS_2010_SIMPLE_EOP :
Predefined.GTOD_CONVENTIONS_2010_ACCURATE_EOP;
break;
default :
// this should never happen
throw new OrekitInternalError(null);
}
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
final Frame tod = getTOD(conventions, applyEOPCorr, simpleEOP);
final ShiftingTransformProvider todInterpolating =
(ShiftingTransformProvider) tod.getTransformProvider();
final TODProvider todRaw = (TODProvider) todInterpolating.getRawProvider();
final EOPHistory eopHistory = todRaw.getEOPHistory();
final GTODProvider gtodRaw = new GTODProvider(conventions, eopHistory);
final TransformProvider gtodShifting =
new ShiftingTransformProvider(gtodRaw,
CartesianDerivativesFilter.USE_PVA,
AngularDerivativesFilter.USE_R,
AbsoluteDate.PAST_INFINITY, AbsoluteDate.FUTURE_INFINITY,
todInterpolating.getGridPoints(), todInterpolating.getStep(),
OrekitConfiguration.getCacheSlotsNumber(),
Constants.JULIAN_YEAR, 30 * Constants.JULIAN_DAY);
frame = new FactoryManagedFrame(tod, gtodShifting, false, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static FactoryManagedFrame getTOD(final boolean applyEOPCorr)
throws OrekitException {
return getTOD(IERSConventions.IERS_1996, applyEOPCorr, false);
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static FactoryManagedFrame getTOD(final IERSConventions conventions,
final boolean simpleEOP)
throws OrekitException {
return getTOD(conventions, true, 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 this method is private.
* </p>
* @param conventions IERS conventions to apply
* @param applyEOPCorr if true, EOP corrections are applied (here, nutation)
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @return the selected reference frame singleton.
* @exception OrekitException if data embedded in the library cannot be read
*/
private static FactoryManagedFrame getTOD(final IERSConventions conventions,
final boolean applyEOPCorr,
final boolean simpleEOP)
throws OrekitException {
synchronized (FramesFactory.class) {
// try to find an already built frame
final Predefined factoryKey;
switch (conventions) {
case IERS_1996 :
factoryKey = applyEOPCorr ?
(simpleEOP ? Predefined.TOD_CONVENTIONS_1996_SIMPLE_EOP : Predefined.TOD_CONVENTIONS_1996_ACCURATE_EOP) :
Predefined.TOD_WITHOUT_EOP_CORRECTIONS;
break;
case IERS_2003 :
factoryKey = simpleEOP ?
Predefined.TOD_CONVENTIONS_2003_SIMPLE_EOP :
Predefined.TOD_CONVENTIONS_2003_ACCURATE_EOP;
break;
case IERS_2010 :
factoryKey = simpleEOP ?
Predefined.TOD_CONVENTIONS_2010_SIMPLE_EOP :
Predefined.TOD_CONVENTIONS_2010_ACCURATE_EOP;
break;
default :
// this should never happen
throw new OrekitInternalError(null);
}
final int interpolationPoints;
final int pointsPerDay;
if (applyEOPCorr) {
interpolationPoints = 6;
pointsPerDay = 24;
} else {
interpolationPoints = 6;
pointsPerDay = 8;
}
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
final EOPHistory eopHistory = applyEOPCorr ? getEOPHistory(conventions, simpleEOP) : null;
final TransformProvider shifting =
new ShiftingTransformProvider(new TODProvider(conventions, eopHistory),
CartesianDerivativesFilter.USE_PVA,
AngularDerivativesFilter.USE_R,
AbsoluteDate.PAST_INFINITY, AbsoluteDate.FUTURE_INFINITY,
interpolationPoints, Constants.JULIAN_DAY / pointsPerDay,
OrekitConfiguration.getCacheSlotsNumber(),
Constants.JULIAN_YEAR, 30 * Constants.JULIAN_DAY);
frame = new FactoryManagedFrame(getMOD(conventions, applyEOPCorr), shifting, true, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static FactoryManagedFrame getMOD(final boolean applyEOPCorr)
throws OrekitException {
return getMOD(IERSConventions.IERS_1996, applyEOPCorr);
}
/** Get the MOD reference frame.
* @param conventions IERS conventions to apply
* @return the selected reference frame singleton.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static FactoryManagedFrame getMOD(final IERSConventions conventions)
throws OrekitException {
return getMOD(conventions, true);
}
/** 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 this method is private.
* </p>
* @param conventions IERS conventions to apply
* @param applyEOPCorr if true, EOP corrections are applied (EME2000/GCRF bias compensation)
* @return the selected reference frame singleton.
* @exception OrekitException if data embedded in the library cannot be read
*/
private static FactoryManagedFrame getMOD(final IERSConventions conventions, final boolean applyEOPCorr)
throws OrekitException {
synchronized (FramesFactory.class) {
final Predefined factoryKey;
final Frame parent;
switch (conventions) {
case IERS_1996 :
factoryKey = applyEOPCorr ? Predefined.MOD_CONVENTIONS_1996 : Predefined.MOD_WITHOUT_EOP_CORRECTIONS;
parent = applyEOPCorr ? FramesFactory.getGCRF() : FramesFactory.getEME2000();
break;
case IERS_2003 :
factoryKey = Predefined.MOD_CONVENTIONS_2003;
// in IERS conventions 2003, the precession angles zetaA, thetaA and zA
// from equation 33 are computed from EME2000, not from GCRF
parent = FramesFactory.getEME2000();
break;
case IERS_2010 :
factoryKey = Predefined.MOD_CONVENTIONS_2010;
// precession angles epsilon0, psiA, omegaA and chiA
// from equations 5.39 and 5.40 are computed from EME2000
parent = FramesFactory.getEME2000();
break;
default :
// this should never happen
throw new OrekitInternalError(null);
}
// try to find an already built frame
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
frame = new FactoryManagedFrame(parent, new MODProvider(conventions), true, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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.
* @exception OrekitException if data embedded in the library cannot be read
*/
public static FactoryManagedFrame getTEME() throws OrekitException {
synchronized (FramesFactory.class) {
// try to find an already built frame
final Predefined factoryKey = Predefined.TEME;
FactoryManagedFrame frame = FRAMES.get(factoryKey);
if (frame == null) {
// it's the first time we need this frame, build it and store it
final Frame tod = getTOD(IERSConventions.IERS_1996, false, true);
final ShiftingTransformProvider todShifting =
(ShiftingTransformProvider) tod.getTransformProvider();
final TEMEProvider temeRaw = new TEMEProvider(IERSConventions.IERS_1996, null);
final TransformProvider temeShifting =
new ShiftingTransformProvider(temeRaw,
CartesianDerivativesFilter.USE_PVA,
AngularDerivativesFilter.USE_R,
AbsoluteDate.PAST_INFINITY, AbsoluteDate.FUTURE_INFINITY,
todShifting.getGridPoints(), todShifting.getStep(),
OrekitConfiguration.getCacheSlotsNumber(),
Constants.JULIAN_YEAR, 30 * Constants.JULIAN_DAY);
frame = new FactoryManagedFrame(tod, temeShifting, true, factoryKey);
FRAMES.put(factoryKey, frame);
}
return frame;
}
}
/** 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
* @throws OrekitException if transform cannot be computed at this date
*/
public static Transform getNonInterpolatingTransform(final Frame from, final Frame to,
final AbsoluteDate date)
throws OrekitException {
// 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);
}
/** Peel interpolation and shifting from a transform provider.
* @param provider transform provider to peel
* @return peeled transform provider
* @exception OrekitException if EOP cannot be retrieved
*/
private static TransformProvider peel(final TransformProvider provider)
throws OrekitException {
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().usesInterpolation()) {
peeled = ((EOPBasedTransformProvider) peeled).getNonInterpolatingProvider();
} else {
peeling = false;
}
}
return peeled;
}
}