Package org.geotools.referencing.datum

Class DefaultGeodeticDatum

Object
Formattable
AbstractIdentifiedObject
AbstractDatum
DefaultGeodeticDatum
All Implemented Interfaces:
Serializable, Datum, GeodeticDatum, IdentifiedObject, PROJFormattable
public class DefaultGeodeticDatum extends AbstractDatum implements GeodeticDatum, PROJFormattable
Defines the location and precise orientation in 3-dimensional space of a defined ellipsoid (or sphere) that approximates the shape of the earth. Used also for Cartesian coordinate system centered in this ellipsoid (or sphere).
Since:
2.1
Author:
Martin Desruisseaux (IRD)
See Also:

  • Field Details

  • Constructor Details

    • DefaultGeodeticDatum

      public DefaultGeodeticDatum(GeodeticDatum datum)
      Constructs a new datum with the same values than the specified one. This copy constructor provides a way to wrap an arbitrary implementation into a Geotools one or a user-defined one (as a subclass), usually in order to leverage some implementation-specific API. This constructor performs a shallow copy, i.e. the properties are not cloned.
      Since:
      2.2

    • DefaultGeodeticDatum

      public DefaultGeodeticDatum(String name, Ellipsoid ellipsoid, PrimeMeridian primeMeridian)
      Constructs a geodetic datum from a name.
      Parameters:
      name - The datum name.
      ellipsoid - The ellipsoid.
      primeMeridian - The prime meridian.

    • DefaultGeodeticDatum

      public DefaultGeodeticDatum(Map<String,?> properties, Ellipsoid ellipsoid, PrimeMeridian primeMeridian)
      Constructs a geodetic datum from a set of properties. The properties map is given unchanged to the super-class constructor. Additionally, the following properties are understood by this construtor:

      Property name Value type Value given to
       "bursaWolf"   BursaWolfParameters or an array of those   getBursaWolfParameters()
      Parameters:
      properties - Set of properties. Should contains at least "name".
      ellipsoid - The ellipsoid.
      primeMeridian - The prime meridian.

  • Method Details

    • getEllipsoid

      public Ellipsoid getEllipsoid()
      Returns the ellipsoid.
      Specified by:
      getEllipsoid in interface GeodeticDatum
      Returns:
      The ellipsoid.

    • getPrimeMeridian

      public PrimeMeridian getPrimeMeridian()
      Returns the prime meridian.
      Specified by:
      getPrimeMeridian in interface GeodeticDatum
      Returns:
      The prime meridian.

    • getBursaWolfParameters

      public BursaWolfParameters[] getBursaWolfParameters()
      Returns all Bursa Wolf parameters specified in the properties map at construction time.
      Since:
      2.4

    • getBursaWolfParameters

      public BursaWolfParameters getBursaWolfParameters(GeodeticDatum target)
      Returns Bursa Wolf parameters for a datum shift toward the specified target, or null if none. This method search only for Bursa-Wolf parameters explicitly specified in the properties map at construction time. This method doesn't try to infer a set of parameters from indirect informations. For example it doesn't try to inverse the parameters specified in the target datum if none were found in this datum. If such an elaborated search is wanted, use getAffineTransform(org.geotools.api.referencing.datum.GeodeticDatum, org.geotools.api.referencing.datum.GeodeticDatum) instead.

    • getAffineTransform

      public static Matrix getAffineTransform(GeodeticDatum source, GeodeticDatum target)
      Returns a matrix that can be used to define a transformation to the specified datum. If no transformation path is found, then this method returns null.
      Parameters:
      source - The source datum.
      target - The target datum.
      Returns:
      An affine transform from source to target, or null if none.
      See Also:

    • isWGS84

      public static boolean isWGS84(Datum datum)
      Returns true if the specified object is equals (at least on computation purpose) to the WGS84 datum. This method may conservatively returns false if the specified datum is uncertain (for example because it come from an other implementation).

    • equals

      public boolean equals(AbstractIdentifiedObject object, boolean compareMetadata)
      Compare this datum with the specified object for equality.
      Overrides:
      equals in class AbstractDatum
      Parameters:
      object - The object to compare to this.
      compareMetadata - true for performing a strict comparaison, or false for comparing only properties relevant to transformations.
      Returns:
      true if both objects are equal.

    • hashCode

      public int hashCode()
      Returns a hash value for this geodetic datum. Name, remarks and the like are not taken in account. In other words, two geodetic datums will return the same hash value if they are equal in the sense of equals(AbstractIdentifiedObject, false).
      Overrides:
      hashCode in class AbstractIdentifiedObject
      Returns:
      The hash code value. This value doesn't need to be the same in past or future versions of this class.

    • formatWKT

      protected String formatWKT(Formatter formatter)
      Format the inner part of a Well Known Text (WKT) element.
      Overrides:
      formatWKT in class AbstractDatum
      Parameters:
      formatter - The formatter to use.
      Returns:
      The WKT element name, which is "DATUM"
      See Also:

    • formatPROJ

      public String formatPROJ(PROJFormatter formatter)
      Description copied from interface: PROJFormattable
      Format the inner part of a PROJFormattable object.

      This method is automatically invoked by PROJFormatter.append(PROJFormattable).

      For example for a element (DefaultOperationMethod) of type Projection, the formatter will invoke this method to prepend the "+proj=" String for completing the PROJ String before appending the Projection Name (e.g. lcc for a Lambert Conformal Conic)

      Specified by:
      formatPROJ in interface PROJFormattable
      Parameters:
      formatter - The PROJFormatter to use.
      Returns:
      The proj String of the PROJ element type if any. (e.g. +ellps= for named ellipsoids, +datum= for named datums).