How to use

getTargetDatum

method

in

org.apache.sis.referencing.datum.BursaWolfParameters

/**
 * Returns the best parameters matching the given criteria, or {@code null} if none.
 */
private BursaWolfParameters select(final GeodeticDatum targetDatum, final ExtentSelector<BursaWolfParameters> selector) {
  if (bursaWolf == null) {
    return null;
  }
  for (final BursaWolfParameters candidate : bursaWolf) {
    if (deepEquals(targetDatum, candidate.getTargetDatum(), ComparisonMode.IGNORE_METADATA)) {
      selector.evaluate(candidate.getDomainOfValidity(), candidate);
    }
  }
  return selector.best();
}

/**
 * Returns the best parameters matching the given criteria, or {@code null} if none.
 */
private BursaWolfParameters select(final GeodeticDatum targetDatum, final ExtentSelector<BursaWolfParameters> selector) {
  if (bursaWolf == null) {
    return null;
  }
  for (final BursaWolfParameters candidate : bursaWolf) {
    if (deepEquals(targetDatum, candidate.getTargetDatum(), ComparisonMode.IGNORE_METADATA)) {
      selector.evaluate(candidate.getDomainOfValidity(), candidate);
    }
  }
  return selector.best();
}

if (datum instanceof DefaultGeodeticDatum) {
  for (final BursaWolfParameters bwp : ((DefaultGeodeticDatum) datum).getBursaWolfParameters()) {
    if (Utilities.equalsIgnoreMetadata(CommonCRS.WGS84.datum(), bwp.getTargetDatum())) {
      definition.append(" +towgs84=").append(bwp.tX).append(',').append(bwp.tY).append(',').append(bwp.tZ);
      if (!bwp.isTranslation()) {

if (datum instanceof DefaultGeodeticDatum) {
  for (final BursaWolfParameters bwp : ((DefaultGeodeticDatum) datum).getBursaWolfParameters()) {
    if (Utilities.equalsIgnoreMetadata(CommonCRS.WGS84.datum(), bwp.getTargetDatum())) {
      definition.append(" +towgs84=").append(bwp.tX).append(',').append(bwp.tY).append(',').append(bwp.tZ);
      if (!bwp.isTranslation()) {

String name = IdentifiedObjects.getUnicodeIdentifier(getTargetDatum());
if (name == null) {
  name = "Unknown";

String name = IdentifiedObjects.getSimpleNameOrIdentifier(getTargetDatum());
if (name == null) {
  name = "Unknown";

/**
 * Tests the {@link BursaWolfParameters#setPositionVectorTransformation(Matrix, double)} method.
 * This is an internal consistency test.
 */
@Test
@DependsOnMethod("testGetPositionVectorTransformation")
public void testSetPositionVectorTransformation() {
  final BursaWolfParameters bursaWolf = createED87_to_WGS84();
  final Matrix matrix = bursaWolf.getPositionVectorTransformation(null);
  final BursaWolfParameters actual = new BursaWolfParameters(
      bursaWolf.getTargetDatum(), bursaWolf.getDomainOfValidity());
  actual.setPositionVectorTransformation(matrix, 1E-10);
  assertEquals(bursaWolf, actual);
}

/**
 * Tests the conversion from {@code CompoundCRS[EPSG:3035 + Sigma-level]} to {@code EPSG:4326}.
 * The interesting part in this test is that the height is not a standard height, and the
 * referencing module is not supposed to known how to build a 3D Geographic CRS (needed as
 * an intermediate step for the datum shift) with that height.
 *
 * @throws FactoryException Should never happen.
 *
 * @see <a href="http://jira.geotoolkit.org/browse/GEOTK-71">GEOTK-71</a>
 */
@Test
@Ignore("JSR-275 does not accept unit named 'level'.")
public void testProjected3D_to_2D() throws FactoryException {
  CoordinateReferenceSystem targetCRS = CommonCRS.WGS84.geographic();
  CoordinateReferenceSystem sourceCRS = CRS.forCode("EPSG:3035");
  GeodeticDatum targetDatum = ((GeographicCRS) targetCRS).getDatum();
  GeodeticDatum sourceDatum =  ((ProjectedCRS) sourceCRS).getDatum();
  final BursaWolfParameters[] params = ((DefaultGeodeticDatum) sourceDatum).getBursaWolfParameters();
  assertEquals("This test requires that an explicit BursaWolf parameter exists.", 1, params.length);
  assertEquals("targetDatum", targetDatum, params[0].getTargetDatum());
  assertTrue("This test requires that the BursaWolf parameter is set to identity.", params[0].isIdentity());
  CoordinateReferenceSystem vertCRS = CRS.fromWKT(
      "VERT_CS[\"Sigma Level\",VERT_DATUM[\"Sigma Level\",2000],UNIT[\"level\",1.0],AXIS[\"Sigma Level\",DOWN]]");
  sourceCRS = new DefaultCompoundCRS(singletonMap(NAME_KEY, "ETRS89 + Sigma level"), sourceCRS, vertCRS);
  final MathTransform tr = CRS.findOperation(sourceCRS, targetCRS, null).getMathTransform();
  assertSame(tr, CRS.findOperation(sourceCRS, targetCRS, null).getMathTransform());
  assertSame(tr, CRS.findOperation(sourceCRS, targetCRS, null).getMathTransform());
  assertEquals(3, tr.getSourceDimensions());
  assertEquals(2, tr.getTargetDimensions());
}