How to use

getVerticalCRS

method

in

org.geotools.referencing.CRS

/**
 * Returns the first vertical coordinate reference system found in a the given CRS, or {@code
 * null} if there is none.
 *
 * @param crs The coordinate reference system, or {@code null}.
 * @return The vertical CRS, or {@code null} if none.
 * @since 2.4
 */
public static VerticalCRS getVerticalCRS(final CoordinateReferenceSystem crs) {
  if (crs instanceof VerticalCRS) {
    return (VerticalCRS) crs;
  }
  if (crs instanceof CompoundCRS) {
    final CompoundCRS cp = (CompoundCRS) crs;
    for (final CoordinateReferenceSystem c : cp.getCoordinateReferenceSystems()) {
      final VerticalCRS candidate = getVerticalCRS(c);
      if (candidate != null) {
        return candidate;
      }
    }
  }
  return null;
}

 /**
  * A simple test
  * @throws Exception if the test fails
  */
 @Test
 public void compoundCrs() throws Exception {
  CoordinateReferenceSystem c = CompoundCRSDecoder.decode("urn:ogc:def:crs,crs:EPSG:6.12:3068,crs:EPSG:6.12:5783");
  assertEquals(CRS.decode("EPSG:3068"), CRS.getHorizontalCRS(c));
  assertEquals(CRS.decode("EPSG:5783"), CRS.getVerticalCRS(c));
 }
}