XYZCovariance.java

  1. /* Copyright 2002-2025 CS GROUP
  2.  * Licensed to CS GROUP (CS) under one or more
  3.  * contributor license agreements.  See the NOTICE file distributed with
  4.  * this work for additional information regarding copyright ownership.
  5.  * CS licenses this file to You under the Apache License, Version 2.0
  6.  * (the "License"); you may not use this file except in compliance with
  7.  * the License.  You may obtain a copy of the License at
  8.  *
  9.  *   http://www.apache.org/licenses/LICENSE-2.0
  10.  *
  11.  * Unless required by applicable law or agreed to in writing, software
  12.  * distributed under the License is distributed on an "AS IS" BASIS,
  13.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14.  * See the License for the specific language governing permissions and
  15.  * limitations under the License.
  16.  */
  17. package org.orekit.files.ccsds.ndm.cdm;

  19. import org.hipparchus.linear.MatrixUtils;
  20. import org.hipparchus.linear.RealMatrix;
  21. import org.orekit.errors.OrekitException;
  22. import org.orekit.errors.OrekitMessages;
  23. import org.orekit.files.ccsds.section.CommentsContainer;

  25. /**
  26.  * Container for XYZ covariance matrix data.
  27.  * <p>
  28.  * Beware that the Orekit getters and setters all rely on SI units. The parsers
  29.  * and writers take care of converting these SI units into CCSDS mandatory units.
  30.  * The {@link org.orekit.utils.units.Unit Unit} class provides useful
  31.  * {@link org.orekit.utils.units.Unit#fromSI(double) fromSi} and
  32.  * {@link org.orekit.utils.units.Unit#toSI(double) toSI} methods in case the callers
  33.  * already use CCSDS units instead of the API SI units. The general-purpose
  34.  * {@link org.orekit.utils.units.Unit Unit} class (without an 's') and the
  35.  * CCSDS-specific {@link org.orekit.files.ccsds.definitions.Units Units} class
  36.  * (with an 's') also provide some predefined units. These predefined units and the
  37.  * {@link org.orekit.utils.units.Unit#fromSI(double) fromSi} and
  38.  * {@link org.orekit.utils.units.Unit#toSI(double) toSI} conversion methods are indeed
  39.  * what the parsers and writers use for the conversions.
  40.  * </p>
  41.  * <p>
  42.  * This class as a RealMatrix as attribute which can be access with
  43.  * {@code getXYZCovariaxMatrix} method. Beware that there are thus two ways to modify
  44.  * the XYZ covariance : {@code setC…} ({@code setCxx}, {@code setCyx}…) which should be
  45.  * prioritized and {@code getXYZCovariaxMatrix.setEntry(row, col, value)}.
  46.  * </p>
  47.  * <p>
  48.  * The XYZ Covariance Matrix is only provided if {@link CdmMetadataKey#ALT_COV_TYPE} is
  49.  * {@link AltCovarianceType#XYZ}, otherwise its terms will return {@code NaN}.
  50.  * </p>
  51.  * <p>
  52.  * When available, the matrix is given in the 9×9 Lower Triangular Form. All parameters
  53.  * of the 6×6 position/velocity submatrix are mandatory. The remaining elements will
  54.  * return {@code NaN} if not provided.
  55.  * </p>
  56.  */
  57. public class XYZCovariance extends CommentsContainer {

  59.     /** XYZ covariance matrix. */
  60.     private final RealMatrix covarianceMatrix;

  62.     /** Flag indicating whether the alternate covariance type set in the CDM Object metadata section is XYZ. */
  63.     private final boolean covXYZset;

  65.     /** Simple constructor. To update matrix value there are 2 ways to modify the XYZ
  66.      * covariance : setC... ( setCxx, setCyx ...) which should be prioritized and
  67.      * getXYZCovariaxMatrix.setEntry(row, col, value).
  68.      * <p> The XYZ Covariance Matrix is only provided if {@link CdmMetadataKey#ALT_COV_TYPE} is {@link AltCovarianceType#XYZ}, otherwise
  69.      * its terms will return NaN. </p>
  70.      * <p> When available, the matrix is given in the 9×9 Lower Triangular Form. All parameters of the 6×6 position/velocity submatrix
  71.      * are mandatory. The remaining elements will return NaN if not provided.</p>
  72.      * @param covXYZset Flag indicating whether the alternate covariance type set in the CDM Object metadata section is XYZ.
  73.      */
  74.     public XYZCovariance(final boolean covXYZset) {
  75.         this.covXYZset = covXYZset;
  76.         covarianceMatrix = MatrixUtils.createRealMatrix(9, 9);
  77.         for (int i = 0; i < covarianceMatrix.getRowDimension(); ++i) {
  78.             for (int j = 0; j <= i; ++j) {
  79.                 covarianceMatrix.setEntry(i, j, Double.NaN);
  80.             }
  81.         }

  83.     }

  85.     /** {@inheritDoc} */
  86.     @Override
  87.     public void validate(final double version) {
  88.         super.validate(version);

  90.         // Conditional on ALT_COV_TYPE = XYZ
  91.         if (!isCovXYZset()) {
  92.             throw new OrekitException(OrekitMessages.CCSDS_DATE_INVALID_PREAMBLE_FIELD, CdmMetadataKey.ALT_COV_TYPE);
  93.         }

  95.         // We only check values that are mandatory in a cdm file
  96.         checkNotNaN(getCxx(),              XYZCovarianceKey.CX_X.name());
  97.         checkNotNaN(getCyx(),              XYZCovarianceKey.CY_X.name());
  98.         checkNotNaN(getCyy(),              XYZCovarianceKey.CY_Y.name());
  99.         checkNotNaN(getCzx(),              XYZCovarianceKey.CZ_X.name());
  100.         checkNotNaN(getCzy(),              XYZCovarianceKey.CZ_Y.name());
  101.         checkNotNaN(getCzz(),              XYZCovarianceKey.CZ_Z.name());
  102.         checkNotNaN(getCxdotx(),           XYZCovarianceKey.CXDOT_X.name());
  103.         checkNotNaN(getCxdoty(),           XYZCovarianceKey.CXDOT_Y.name());
  104.         checkNotNaN(getCxdotz(),           XYZCovarianceKey.CXDOT_Z.name());
  105.         checkNotNaN(getCxdotxdot(),        XYZCovarianceKey.CXDOT_XDOT.name());
  106.         checkNotNaN(getCydotx(),           XYZCovarianceKey.CYDOT_X.name());
  107.         checkNotNaN(getCydoty(),           XYZCovarianceKey.CYDOT_Y.name());
  108.         checkNotNaN(getCydotz(),           XYZCovarianceKey.CYDOT_Z.name());
  109.         checkNotNaN(getCydotxdot(),        XYZCovarianceKey.CYDOT_XDOT.name());
  110.         checkNotNaN(getCydotydot(),        XYZCovarianceKey.CYDOT_YDOT.name());
  111.         checkNotNaN(getCzdotx(),           XYZCovarianceKey.CZDOT_X.name());
  112.         checkNotNaN(getCzdoty(),           XYZCovarianceKey.CZDOT_Y.name());
  113.         checkNotNaN(getCzdotz(),           XYZCovarianceKey.CZDOT_Z.name());
  114.         checkNotNaN(getCzdotxdot(),        XYZCovarianceKey.CZDOT_XDOT.name());
  115.         checkNotNaN(getCzdotydot(),        XYZCovarianceKey.CZDOT_YDOT.name());
  116.         checkNotNaN(getCzdotzdot(),        XYZCovarianceKey.CZDOT_ZDOT.name());
  117.     }

  119.     /** Set an entry in the XYZ covariance matrix.
  120.      * <p>
  121.      * Both m(j, k) and m(k, j) are set.
  122.      * </p>
  123.      * @param j row index (must be between 0 and 5 (inclusive)
  124.      * @param k column index (must be between 0 and 5 (inclusive)
  125.      * @param entry value of the matrix entry
  126.      */
  127.     public void setCovarianceMatrixEntry(final int j, final int k, final double entry) {
  128.         covarianceMatrix.setEntry(j, k, entry);
  129.         covarianceMatrix.setEntry(k, j, entry);
  130.     }

  132.     /**
  133.      * Get the XYZ covariance matrix.
  134.      * <p> The XYZ Covariance Matrix is only provided if {@link CdmMetadataKey#ALT_COV_TYPE} is {@link AltCovarianceType#XYZ}, otherwise
  135.      * its terms will return NaN. </p>
  136.      * <p> When available, the matrix is given in the 9×9 Lower Triangular Form. All parameters of the 6×6 position/velocity submatrix
  137.      * are mandatory. The remaining elements will return NaN if not provided.</p>
  138.      * @return the XYZ covariance matrix
  139.      */
  140.     public RealMatrix getXYZCovarianceMatrix() {
  141.         return covarianceMatrix;
  142.     }

  144.     /**
  145.      * Get the object [1,1] in covariance matrix (with index starting at 1).
  146.      * @return the object [1,1] in covariance matrix (in m²)
  147.      */
  148.     public double getCxx() {
  149.         return covarianceMatrix.getEntry(0, 0);
  150.     }

  152.     /**
  153.      * Set the object [1,1] in covariance matrix (with index starting at 1).
  154.      * @param CXX = object [1,1] in covariance matrix (in m²)
  155.      */
  156.     public void setCxx(final double CXX) {
  157.         refuseFurtherComments();

  159.         // Conditional on ALT_COV_TYPE = XYZ
  160.         if (!isCovXYZset()) {
  161.             throw new OrekitException(OrekitMessages.CCSDS_DATE_INVALID_PREAMBLE_FIELD, CdmMetadataKey.ALT_COV_TYPE);
  162.         }

  164.         setCovarianceMatrixEntry(0, 0, CXX);
  165.     }

  167.     /**
  168.      * Get the object [2,1] in covariance matrix (with index starting at 1).
  169.      * @return the object [2,1] in covariance matrix (in m²)
  170.      */
  171.     public double getCyx() {
  172.         return covarianceMatrix.getEntry(1, 0);
  173.     }

  175.     /**
  176.      * Set the object [2,1] in covariance matrix (with index starting at 1).
  177.      * @param CYX = object [2,1] in covariance matrix (in m²)
  178.      */
  179.     public void setCyx(final double CYX) {
  180.         refuseFurtherComments();
  181.         setCovarianceMatrixEntry(1, 0, CYX);
  182.     }

  184.     /**
  185.      * Get the object [2,2] in covariance matrix (with index starting at 1).
  186.      * @return the object [2,2] in covariance matrix (in m²)
  187.      */
  188.     public double getCyy() {
  189.         return covarianceMatrix.getEntry(1, 1);
  190.     }

  192.     /**
  193.      * Set the object [2,2] in covariance matrix (with index starting at 1).
  194.      * @param CYY = object [2,2] in covariance matrix (in m²)
  195.      */
  196.     public void setCyy(final double CYY) {
  197.         refuseFurtherComments();
  198.         setCovarianceMatrixEntry(1, 1, CYY);
  199.     }

  201.     /**
  202.      * Get the object [3,1] in covariance matrix (with index starting at 1).
  203.      * @return the object [3,1] in covariance matrix (in m²)
  204.      */
  205.     public double getCzx() {
  206.         return covarianceMatrix.getEntry(2, 0);
  207.     }

  209.     /**
  210.      * Set the object [3,1] in covariance matrix (with index starting at 1).
  211.      * @param CZX = object [3,1] in covariance matrix (in m²)
  212.      */
  213.     public void setCzx(final double CZX) {
  214.         refuseFurtherComments();
  215.         setCovarianceMatrixEntry(2, 0, CZX);
  216.     }

  218.     /**
  219.      * Get the object [3,2] in covariance matrix (with index starting at 1).
  220.      * @return the object [3,2] in covariance matrix (in m²)
  221.      */
  222.     public double getCzy() {
  223.         return covarianceMatrix.getEntry(2, 1);
  224.     }

  226.     /**
  227.      * Set the object [3,2] in covariance matrix (with index starting at 1).
  228.      * @param CZY = object [3,2] in covariance matrix (in m²)
  229.      */
  230.     public void setCzy(final double CZY) {
  231.         refuseFurtherComments();
  232.         setCovarianceMatrixEntry(2, 1, CZY);
  233.     }

  235.     /**
  236.      * Get the object [3,3] in covariance matrix (with index starting at 1).
  237.      * @return the object [3,3] in covariance matrix (in m²)
  238.      */
  239.     public double getCzz() {
  240.         return covarianceMatrix.getEntry(2, 2);
  241.     }

  243.     /**
  244.      * Set the object [3,3] in covariance matrix (with index starting at 1).
  245.      * @param CZZ = object [3,3] in covariance matrix (in m²)
  246.      */
  247.     public void setCzz(final double CZZ) {
  248.         refuseFurtherComments();
  249.         setCovarianceMatrixEntry(2, 2, CZZ);
  250.     }

  252.     /**
  253.      * Get the object [4,1] in covariance matrix (with index starting at 1).
  254.      * @return the object [4,1] in covariance matrix (in m²/s)
  255.      */
  256.     public double getCxdotx() {
  257.         return covarianceMatrix.getEntry(3, 0);
  258.     }

  260.     /**
  261.      * Set the object [4,1] in covariance matrix (with index starting at 1).
  262.      * @param CXdotX = object [4,1] in covariance matrix (in m²/s)
  263.      */
  264.     public void setCxdotx(final double CXdotX) {
  265.         refuseFurtherComments();
  266.         setCovarianceMatrixEntry(3, 0, CXdotX);
  267.     }

  269.     /**
  270.      * Get the object [4,2] in covariance matrix (with index starting at 1).
  271.      * @return the object [4,2] in covariance matrix (in m²/s)
  272.      */
  273.     public double getCxdoty() {
  274.         return covarianceMatrix.getEntry(3, 1);
  275.     }

  277.     /**
  278.      * Set the object [4, 2] in covariance matrix (with index starting at 1).
  279.      * @param CXdotY = object [4, 2] in covariance matrix (in m²/s)
  280.      */
  281.     public void setCxdoty(final double CXdotY) {
  282.         refuseFurtherComments();
  283.         setCovarianceMatrixEntry(3, 1, CXdotY);
  284.     }

  286.     /**
  287.      * Get the object [4, 3] in covariance matrix (with index starting at 1) .
  288.      * @return the object [4, 3] in covariance matrix (in m²/s)
  289.      */
  290.     public double getCxdotz() {
  291.         return covarianceMatrix.getEntry(3, 2);
  292.     }

  294.     /**
  295.      * Set the object [4, 3] in covariance matrix (with index starting at 1).
  296.      * @param CXdotZ = object [4,3] in covariance matrix (in m²/s)
  297.      */
  298.     public void setCxdotz(final double CXdotZ) {
  299.         refuseFurtherComments();
  300.         setCovarianceMatrixEntry(3, 2, CXdotZ);
  301.     }

  303.     /**
  304.      * Get the object [4, 4] in covariance matrix (with index starting at 1).
  305.      * @return the object [4, 4] in covariance matrix (in m²/s²)
  306.      */
  307.     public double getCxdotxdot() {
  308.         return covarianceMatrix.getEntry(3, 3);
  309.     }

  311.     /**
  312.      * Set the object [4, 4] in covariance matrix (with index starting at 1).
  313.      * @param CXdotXdot = object [4, 4] in covariance matrix (in m²/s²)
  314.      */
  315.     public void setCxdotxdot(final double CXdotXdot) {
  316.         refuseFurtherComments();
  317.         setCovarianceMatrixEntry(3, 3, CXdotXdot);
  318.     }

  320.     /**
  321.      * Get the object [5, 1] in covariance matrix (with index starting at 1).
  322.      * @return the object [5, 1] in covariance matrix (in m²/s)
  323.      */
  324.     public double getCydotx() {
  325.         return covarianceMatrix.getEntry(4, 0);
  326.     }

  328.     /**
  329.      * Set the object [5,1] in covariance matrix (with index starting at 1).
  330.      * @param CYdotX = object [5,1] in covariance matrix (in m²/s)
  331.      */
  332.     public void setCydotx(final double CYdotX) {
  333.         refuseFurtherComments();
  334.         setCovarianceMatrixEntry(4, 0, CYdotX);
  335.     }

  337.     /**
  338.      * Get the object [5,2] in covariance matrix (with index starting at 1).
  339.      * @return the object [5,2] in covariance matrix (in m²/s)
  340.      */
  341.     public double getCydoty() {
  342.         return covarianceMatrix.getEntry(4, 1);
  343.     }

  345.     /**
  346.      * Set the object [5,2] in covariance matrix (with index starting at 1).
  347.      * @param CYdotY = object [5,2] in covariance matrix (in m²/s)
  348.      */
  349.     public void setCydoty(final double CYdotY) {
  350.         refuseFurtherComments();
  351.         setCovarianceMatrixEntry(4, 1, CYdotY);
  352.     }

  354.     /**
  355.      * Get the object [5,3] in covariance matrix (with index starting at 1).
  356.      * @return the object [5,3] in covariance matrix (in m²/s)
  357.      */
  358.     public double getCydotz() {
  359.         return covarianceMatrix.getEntry(4, 2);
  360.     }

  362.     /**
  363.      * Set the object [5,3] in covariance matrix (with index starting at 1).
  364.      * @param CYdotZ = object [5,3] in covariance matrix (in m²/s)
  365.      */
  366.     public void setCydotz(final double CYdotZ) {
  367.         refuseFurtherComments();
  368.         setCovarianceMatrixEntry(4, 2, CYdotZ);
  369.     }

  371.     /**
  372.      * Get the object [5,4] in covariance matrix (with index starting at 1).
  373.      * @return the object [5,4] in covariance matrix (in m²/s²)
  374.      */
  375.     public double getCydotxdot() {
  376.         return covarianceMatrix.getEntry(4, 3);
  377.     }

  379.     /**
  380.      * Set the object [5,4] in covariance matrix (with index starting at 1).
  381.      * @param CYdotXdot = object [5,4] in covariance matrix (in m²/s²)
  382.      */
  383.     public void setCydotxdot(final double CYdotXdot) {
  384.         refuseFurtherComments();
  385.         setCovarianceMatrixEntry(4, 3, CYdotXdot);
  386.     }

  388.     /**
  389.      * Get the object [5,5] in covariance matrix (with index starting at 1).
  390.      * @return the object [5,5] in covariance matrix (in m²/s²)
  391.      */
  392.     public double getCydotydot() {
  393.         return covarianceMatrix.getEntry(4, 4);
  394.     }

  396.     /**
  397.      * Set the object [5,5] in covariance matrix (with index starting at 1).
  398.      * @param CYdotYdot = object [5,5] in covariance matrix (in m²/s²)
  399.      */
  400.     public void setCydotydot(final double CYdotYdot) {
  401.         refuseFurtherComments();
  402.         setCovarianceMatrixEntry(4, 4, CYdotYdot);
  403.     }

  405.     /**
  406.      * Get the object [6,1] in covariance matrix (with index starting at 1).
  407.      * @return the object [6,1] in covariance matrix (in m²/s)
  408.      */
  409.     public double getCzdotx() {
  410.         return covarianceMatrix.getEntry(5, 0);
  411.     }

  413.     /**
  414.      * Set the object [6,1] in covariance matrix (with index starting at 1).
  415.      * @param CZdotX = object [6,1] in covariance matrix (in m²/s)
  416.      */
  417.     public void setCzdotx(final double CZdotX) {
  418.         refuseFurtherComments();
  419.         setCovarianceMatrixEntry(5, 0, CZdotX);
  420.     }

  422.     /**
  423.      * Get the object [6,2] in covariance matrix (with index starting at 1).
  424.      * @return the object [6,2] in covariance matrix (in m²/s)
  425.      */
  426.     public double getCzdoty() {
  427.         return covarianceMatrix.getEntry(5, 1);
  428.     }

  430.     /**
  431.      * Set the object [6,2] in covariance matrix (with index starting at 1).
  432.      * @param CZdotY = object [6,2] in covariance matrix (in m²/s)
  433.      */
  434.     public void setCzdoty(final double CZdotY) {
  435.         refuseFurtherComments();
  436.         setCovarianceMatrixEntry(5, 1, CZdotY);
  437.     }

  439.     /**
  440.      * Get the object [6,3] in covariance matrix (with index starting at 1).
  441.      * @return the object [6,3] in covariance matrix (in m²/s)
  442.      */
  443.     public double getCzdotz() {
  444.         return covarianceMatrix.getEntry(5, 2);
  445.     }

  447.     /**
  448.      * Set the object [6,3] in covariance matrix (with index starting at 1).
  449.      * @param CZdotZ = object [6,3] in covariance matrix (in m²/s)
  450.      */
  451.     public void setCzdotz(final double CZdotZ) {
  452.         refuseFurtherComments();
  453.         setCovarianceMatrixEntry(5, 2, CZdotZ);
  454.     }

  456.     /**
  457.      * Get the object [6,4] in covariance matrix (with index starting at 1).
  458.      * @return the object [6,4] in covariance matrix (in m²/s²)
  459.      */
  460.     public double getCzdotxdot() {
  461.         return covarianceMatrix.getEntry(5, 3);
  462.     }

  464.     /**
  465.      * Set the object [6,4] in covariance matrix (with index starting at 1).
  466.      * @param CZdotXdot = object [6,4] in covariance matrix (in m²/s²)
  467.      */
  468.     public void setCzdotxdot(final double CZdotXdot) {
  469.         refuseFurtherComments();
  470.         setCovarianceMatrixEntry(5, 3, CZdotXdot);
  471.     }

  473.     /**
  474.      * Get the object [6,5] in covariance matrix (with index starting at 1).
  475.      * @return the object [6,5] in covariance matrix (in m²/s²)
  476.      */
  477.     public double getCzdotydot() {
  478.         return covarianceMatrix.getEntry(5, 4);
  479.     }

  481.     /**
  482.      * Set the object [6,5] in covariance matrix (with index starting at 1).
  483.      * @param CZdotYdot = object [6,5] in covariance matrix (in m²/s²)
  484.      */
  485.     public void setCzdotydot(final double CZdotYdot) {
  486.         refuseFurtherComments();
  487.         setCovarianceMatrixEntry(5, 4, CZdotYdot);
  488.     }

  490.     /**
  491.      * Get the object [6,6] in covariance matrix (with index starting at 1).
  492.      * @return the object [6,6] in covariance matrix (in m²/s²)
  493.      */
  494.     public double getCzdotzdot() {
  495.         return covarianceMatrix.getEntry(5, 5);
  496.     }

  498.     /**
  499.      * Set the object [6,6] in covariance matrix (with index starting at 1).
  500.      * @param CZdotZdot = object [6,6] in covariance matrix (in m²/s²)
  501.      */
  502.     public void setCzdotzdot(final double CZdotZdot) {
  503.         refuseFurtherComments();
  504.         setCovarianceMatrixEntry(5, 5, CZdotZdot);
  505.     }

  507.     /**
  508.      * Get the object [7,1] in covariance matrix (with index starting at 1).
  509.      * @return the object [7,1] in covariance matrix (in m³/kg)
  510.      */
  511.     public double getCdrgx() {
  512.         return covarianceMatrix.getEntry(6, 0);
  513.     }

  515.     /**
  516.      * Set the object [7,1] in covariance matrix (with index starting at 1).
  517.      * @param CDRGX = object [7,1] in covariance matrix (in m³/kg)
  518.      */
  519.     public void setCdrgx(final double CDRGX) {
  520.         refuseFurtherComments();
  521.         setCovarianceMatrixEntry(6, 0, CDRGX);
  522.     }

  524.     /**
  525.      * Get the object [7,2] in covariance matrix.
  526.      * @return the object [7,2] in covariance matrix (in m³/kg)
  527.      */
  528.     public double getCdrgy() {
  529.         return covarianceMatrix.getEntry(6, 1);
  530.     }

  532.     /**
  533.      * Set the object [7,2] in covariance matrix (with index starting at 1).
  534.      * @param CDRGY = object [7,2] in covariance matrix (in m³/kg)
  535.      */
  536.     public void setCdrgy(final double CDRGY) {
  537.         refuseFurtherComments();
  538.         setCovarianceMatrixEntry(6, 1, CDRGY);
  539.     }

  541.     /**
  542.      * Get the object [7,3] in covariance matrix (with index starting at 1).
  543.      * @return the object [7,3] in covariance matrix (in m³/kg)
  544.      */
  545.     public double getCdrgz() {
  546.         return covarianceMatrix.getEntry(6, 2);
  547.     }

  549.     /**
  550.      * Set the object [7,3] in covariance matrix (with index starting at 1).
  551.      * @param CDRGZ = object [7,3] in covariance matrix (in m³/kg)
  552.      */
  553.     public void setCdrgz(final double CDRGZ) {
  554.         refuseFurtherComments();
  555.         setCovarianceMatrixEntry(6, 2, CDRGZ);
  556.     }

  558.     /**
  559.      * Get the object [7,4] in covariance matrix (with index starting at 1).
  560.      * @return the object [7,4] in covariance matrix (in m³/(kg.s))
  561.      */
  562.     public double getCdrgxdot() {
  563.         return covarianceMatrix.getEntry(6, 3);
  564.     }

  566.     /**
  567.      * Set the object [7,4] in covariance matrix (with index starting at 1).
  568.      * @param CDRGXdot = object [7,4] in covariance matrix (in m³/(kg.s))
  569.      */
  570.     public void setCdrgxdot(final double CDRGXdot) {
  571.         refuseFurtherComments();
  572.         setCovarianceMatrixEntry(6, 3, CDRGXdot);
  573.     }

  575.     /**
  576.      * Get the object [7,5] in covariance matrix (with index starting at 1).
  577.      * @return the object [7,5] in covariance matrix (in m³/(kg.s))
  578.      */
  579.     public double getCdrgydot() {
  580.         return covarianceMatrix.getEntry(6, 4);
  581.     }

  583.     /**
  584.      * Set the object [7,5] in covariance matrix (with index starting at 1).
  585.      * @param CDRGYdot = object [7,5] in covariance matrix (in m³/(kg.s))
  586.      */
  587.     public void setCdrgydot(final double CDRGYdot) {
  588.         refuseFurtherComments();
  589.         setCovarianceMatrixEntry(6, 4, CDRGYdot);
  590.     }

  592.     /**
  593.      * Get the object [7,6] in covariance matrix (with index starting at 1).
  594.      * @return the object [7,6] in covariance matrix (in m³/(kg.s))
  595.      */
  596.     public double getCdrgzdot() {
  597.         return covarianceMatrix.getEntry(6, 5);
  598.     }

  600.     /**
  601.      * Set the object [7,6] in covariance matrix (with index starting at 1).
  602.      * @param CDRGZdot = object [7,6] in covariance matrix (in m³/(kg.s))
  603.      */
  604.     public void setCdrgzdot(final double CDRGZdot) {
  605.         refuseFurtherComments();
  606.         setCovarianceMatrixEntry(6, 5, CDRGZdot);
  607.     }

  609.     /**
  610.      * Get the object [7,7] in covariance matrix (with index starting at 1).
  611.      * @return the object [7,7] in covariance matrix (in m⁴/kg²)
  612.      */
  613.     public double getCdrgdrg() {
  614.         return covarianceMatrix.getEntry(6, 6);
  615.     }

  617.     /**
  618.      * Set the object [7,7] in covariance matrix (with index starting at 1).
  619.      * @param CDRGDRG = object [7,7] in covariance matrix (in m⁴/kg²)
  620.      */
  621.     public void setCdrgdrg(final double CDRGDRG) {
  622.         refuseFurtherComments();
  623.         setCovarianceMatrixEntry(6, 6, CDRGDRG);
  624.     }

  626.     /**
  627.      * Get the object [8,1] in covariance matrix (with index starting at 1).
  628.      * @return the object [8,1] in covariance matrix (in m³/kg)
  629.      */
  630.     public double getCsrpx() {
  631.         return covarianceMatrix.getEntry(7, 0);
  632.     }

  634.     /**
  635.      * Set the object [8,1] in covariance matrix (with index starting at 1).
  636.      * @param CSRPX = object [8,1] in covariance matrix (in m³/kg)
  637.      */
  638.     public void setCsrpx(final double CSRPX) {
  639.         refuseFurtherComments();
  640.         setCovarianceMatrixEntry(7, 0, CSRPX);
  641.     }

  643.     /**
  644.      * Get the object [8,2] in covariance matrix (with index starting at 1).
  645.      * @return the object [8,2] in covariance matrix (in m³/kg)
  646.      */
  647.     public double getCsrpy() {
  648.         return covarianceMatrix.getEntry(7, 1);
  649.     }

  651.     /**
  652.      * Set the object [8,2] in covariance matrix (with index starting at 1).
  653.      * @param CSRPY = object [8,2] in covariance matrix (in m³/kg)
  654.      */
  655.     public void setCsrpy(final double CSRPY) {
  656.         refuseFurtherComments();
  657.         setCovarianceMatrixEntry(7, 1, CSRPY);
  658.     }

  660.     /**
  661.      * Get the object [8,3] in covariance matrix (with index starting at 1).
  662.      * @return the object [8,3] in covariance matrix (in m³/kg)
  663.      */
  664.     public double getCsrpz() {
  665.         return covarianceMatrix.getEntry(7, 2);
  666.     }

  668.     /**
  669.      * Set the object [8,3] in covariance matrix (with index starting at 1).
  670.      * @param CSRPZ = object [8,3] in covariance matrix (in m³/kg)
  671.      */
  672.     public void setCsrpz(final double CSRPZ) {
  673.         refuseFurtherComments();
  674.         setCovarianceMatrixEntry(7, 2, CSRPZ);
  675.     }

  677.     /**
  678.      * Get the object [8,4] in covariance matrix (with index starting at 1).
  679.      * @return the object [8,4] in covariance matrix (in m³/(kg.s))
  680.      */
  681.     public double getCsrpxdot() {
  682.         return covarianceMatrix.getEntry(7, 3);
  683.     }

  685.     /**
  686.      * Set the object [8,4] in covariance matrix (with index starting at 1).
  687.      * @param CSRPXdot = object [8,4] in covariance matrix (in m³/(kg.s))
  688.      */
  689.     public void setCsrpxdot(final double CSRPXdot) {
  690.         refuseFurtherComments();
  691.         setCovarianceMatrixEntry(7, 3, CSRPXdot);
  692.     }

  694.     /**
  695.      * Get the object [8,5] in covariance matrix (with index starting at 1).
  696.      * @return the object [8,5] in covariance matrix (in m³/(kg.s))
  697.      */
  698.     public double getCsrpydot() {
  699.         return covarianceMatrix.getEntry(7, 4);
  700.     }

  702.     /**
  703.      * Set the object [8,5] in covariance matrix (with index starting at 1).
  704.      * @param CSRPYdot = object [8,5] in covariance matrix (in m³/(kg.s))
  705.      */
  706.     public void setCsrpydot(final double CSRPYdot) {
  707.         refuseFurtherComments();
  708.         setCovarianceMatrixEntry(7, 4, CSRPYdot);
  709.     }

  711.     /**
  712.      * Get the object [8,6] in covariance matrix (with index starting at 1).
  713.      * @return the object [8,6] in covariance matrix (in m³/(kg.s))
  714.      */
  715.     public double getCsrpzdot() {
  716.         return covarianceMatrix.getEntry(7, 5);
  717.     }

  719.     /**
  720.      * Set the object [8,6] in covariance matrix (with index starting at 1).
  721.      * @param CSRPZdot = object [8,6] in covariance matrix (in m³/(kg.s))
  722.      */
  723.     public void setCsrpzdot(final double CSRPZdot) {
  724.         refuseFurtherComments();
  725.         setCovarianceMatrixEntry(7, 5, CSRPZdot);
  726.     }

  728.     /**
  729.      * Get the object [8,7] in covariance matrix (with index starting at 1).
  730.      * @return the object [8,7] in covariance matrix (in m⁴/kg²)
  731.      */
  732.     public double getCsrpdrg() {
  733.         return covarianceMatrix.getEntry(7, 6);
  734.     }

  736.     /**
  737.      * Set the object [8,7] in covariance matrix (with index starting at 1).
  738.      * @param CSRPDRG = object [8,7] in covariance matrix (in m⁴/kg²)
  739.      */
  740.     public void setCsrpdrg(final double CSRPDRG) {
  741.         refuseFurtherComments();
  742.         setCovarianceMatrixEntry(7, 6, CSRPDRG);
  743.     }

  745.     /**
  746.      * Get the object [8,8] in covariance matrix (with index starting at 1).
  747.      * @return the object [8,8] in covariance matrix (in m⁴/kg²)
  748.      */
  749.     public double getCsrpsrp() {
  750.         return covarianceMatrix.getEntry(7, 7);
  751.     }

  753.     /**
  754.      * Set the object [8,8] in covariance matrix (with index starting at 1).
  755.      * @param CSRPSRP = object [8,8] in covariance matrix (in m⁴/kg²)
  756.      */
  757.     public void setCsrpsrp(final double CSRPSRP) {
  758.         refuseFurtherComments();
  759.         setCovarianceMatrixEntry(7, 7, CSRPSRP);
  760.     }

  762.     /**
  763.      * Get the object [9,1] in covariance matrix (with index starting at 1).
  764.      * @return the object [9,1] in covariance matrix (in m²/s²)
  765.      */
  766.     public double getCthrx() {
  767.         return covarianceMatrix.getEntry(8, 0);
  768.     }

  770.     /**
  771.      * Set the object [9,1] in covariance matrix (with index starting at 1).
  772.      * @param CTHRX = object [9,1] in covariance matrix (in m²/s²)
  773.      */
  774.     public void setCthrx(final double CTHRX) {
  775.         refuseFurtherComments();
  776.         setCovarianceMatrixEntry(8, 0, CTHRX);
  777.     }

  779.     /**
  780.      * Get the object [9,2] in covariance matrix (with index starting at 1).
  781.      * @return the object [9,2] in covariance matrix (in m²/s²)
  782.      */
  783.     public double getCthry() {
  784.         return covarianceMatrix.getEntry(8, 1);
  785.     }

  787.     /**
  788.      * Set the object [9,2] in covariance matrix (with index starting at 1).
  789.      * @param CTHRY = object [9,2] in covariance matrix (in m²/s²)
  790.      */
  791.     public void setCthry(final double CTHRY) {
  792.         refuseFurtherComments();
  793.         setCovarianceMatrixEntry(8, 1, CTHRY);
  794.     }

  796.     /**
  797.      * Get the object [9,3] in covariance matrix (with index starting at 1).
  798.      * @return the object [9,3] in covariance matrix (in m²/s²)
  799.      */
  800.     public double getCthrz() {
  801.         return covarianceMatrix.getEntry(8, 2);
  802.     }

  804.     /**
  805.      * Set the object [9,3] in covariance matrix (with index starting at 1).
  806.      * @param CTHRZ = object [9,3] in covariance matrix (in m²/s²)
  807.      */
  808.     public void setCthrz(final double CTHRZ) {
  809.         refuseFurtherComments();
  810.         setCovarianceMatrixEntry(8, 2, CTHRZ);
  811.     }

  813.     /**
  814.      * Get the object [9,4] in covariance matrix (with index starting at 1).
  815.      * @return the object [9,4] in covariance matrix (in m²/s³)
  816.      */
  817.     public double getCthrxdot() {
  818.         return covarianceMatrix.getEntry(8, 3);
  819.     }

  821.     /**
  822.      * Set the object [9,4] in covariance matrix (with index starting at 1).
  823.      * @param CTHRXdot = object [9,4] in covariance matrix (in m²/s³)
  824.      */
  825.     public void setCthrxdot(final double CTHRXdot) {
  826.         refuseFurtherComments();
  827.         setCovarianceMatrixEntry(8, 3, CTHRXdot);
  828.     }

  830.     /**
  831.      * Get the object [9,5] in covariance matrix (with index starting at 1).
  832.      * @return the object [9,5] in covariance matrix (in m²/s³)
  833.      */
  834.     public double getCthrydot() {
  835.         return covarianceMatrix.getEntry(8, 4);
  836.     }

  838.     /**
  839.      * Set the object [9,5] in covariance matrix (with index starting at 1).
  840.      * @param CTHRYdot = object [9,5] in covariance matrix (in m²/s³)
  841.      */
  842.     public void setCthrydot(final double CTHRYdot) {
  843.         refuseFurtherComments();
  844.         setCovarianceMatrixEntry(8, 4, CTHRYdot);
  845.     }

  847.     /**
  848.      * Get the object [9,6] in covariance matrix (with index starting at 1).
  849.      * @return the object [9,6] in covariance matrix (in m²/s³)
  850.      */
  851.     public double getCthrzdot() {
  852.         return covarianceMatrix.getEntry(8, 5);
  853.     }

  855.     /**
  856.      * Set the object [9,6] in covariance matrix (with index starting at 1).
  857.      * @param CTHRZdot = object [9,6] in covariance matrix (in m²/s³)
  858.      */
  859.     public void setCthrzdot(final double CTHRZdot) {
  860.         refuseFurtherComments();
  861.         setCovarianceMatrixEntry(8, 5, CTHRZdot);
  862.     }

  864.     /**
  865.      * Get the object [9,7] in covariance matrix (with index starting at 1).
  866.      * @return the object [9,7] in covariance matrix (in m³/(kg.s²))
  867.      */
  868.     public double getCthrdrg() {
  869.         return covarianceMatrix.getEntry(8, 6);
  870.     }

  872.     /**
  873.      * Set the object [9,7] in covariance matrix (with index starting at 1).
  874.      * @param CTHRDRG = object [9,7] in covariance matrix (in m³/(kg.s²))
  875.      */
  876.     public void setCthrdrg(final double CTHRDRG) {
  877.         refuseFurtherComments();
  878.         setCovarianceMatrixEntry(8, 6, CTHRDRG);
  879.     }

  881.     /**
  882.      * Get the object [9,8] in covariance matrix (with index starting at 1).
  883.      * @return the object [9,8] in covariance matrix (in m³/(kg.s²))
  884.      */
  885.     public double getCthrsrp() {
  886.         return covarianceMatrix.getEntry(8, 7);
  887.     }

  889.     /**
  890.      * Set the object [9,8] in covariance matrix (with index starting at 1).
  891.      * @param CTHRSRP = object [9,8] in covariance matrix (in m³/(kg.s²))
  892.      */
  893.     public void setCthrsrp(final double CTHRSRP) {
  894.         refuseFurtherComments();
  895.         setCovarianceMatrixEntry(8, 7, CTHRSRP);
  896.     }

  898.     /**
  899.      * Get the object [9,9] in covariance matrix (with index starting at 1).
  900.      * @return the object [9,9] in covariance matrix (in m²/s⁴)
  901.      */
  902.     public double getCthrthr() {
  903.         return covarianceMatrix.getEntry(8, 8);
  904.     }

  906.     /**
  907.      * Set the object [9,9] in covariance matrix (with index starting at 1).
  908.      * @param CTHRTHR = object [9,9] in covariance matrix (in m²/s⁴)
  909.      */
  910.     public void setCthrthr(final double CTHRTHR) {
  911.         refuseFurtherComments();
  912.         setCovarianceMatrixEntry(8, 8, CTHRTHR);
  913.     }

  915.     /** Get the flag indicating whether the alternate covariance type set in the CDM Object metadata section is XYZ.
  916.      * @return the covXYZset
  917.      */
  918.     public boolean isCovXYZset() {
  919.         return covXYZset;
  920.     }
  921. }
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