Package org.geotools.referencing.datum

Class DefaultPrimeMeridian

Object
Formattable
AbstractIdentifiedObject
DefaultPrimeMeridian
All Implemented Interfaces:
Serializable, PrimeMeridian, IdentifiedObject, PROJFormattable
public class DefaultPrimeMeridian extends AbstractIdentifiedObject implements PrimeMeridian, PROJFormattable
A prime meridian defines the origin from which longitude values are determined. The name initial value is "Greenwich", and that value shall be used when the greenwich longitude value is zero.
Since:
2.1
Author:
Martin Desruisseaux (IRD)
See Also:

  • Field Details

    • GREENWICH

      public static final DefaultPrimeMeridian GREENWICH
      The Greenwich meridian, with angular measurements in decimal degrees.

  • Constructor Details

    • DefaultPrimeMeridian

      public DefaultPrimeMeridian(PrimeMeridian meridian)
      Constructs a new prime meridian 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.
      Parameters:
      meridian - The prime meridian to copy.
      Since:
      2.2

    • DefaultPrimeMeridian

      public DefaultPrimeMeridian(String name, double greenwichLongitude)
      Constructs a prime meridian from a name. The greenwichLongitude value is assumed in decimal degrees.
      Parameters:
      name - The datum name.
      greenwichLongitude - The longitude value relative to the Greenwich Meridian.

    • DefaultPrimeMeridian

      public DefaultPrimeMeridian(String name, double greenwichLongitude, Unit<Angle> angularUnit)
      Constructs a prime meridian from a name.
      Parameters:
      name - The datum name.
      greenwichLongitude - The longitude value relative to the Greenwich Meridian.
      angularUnit - The angular unit of the longitude.

    • DefaultPrimeMeridian

      public DefaultPrimeMeridian(Map<String,?> properties, double greenwichLongitude, Unit<Angle> angularUnit)
      Constructs a prime meridian from a set of properties. The properties map is given unchanged to the super-class constructor.
      Parameters:
      properties - Set of properties. Should contains at least "name".
      greenwichLongitude - The longitude value relative to the Greenwich Meridian.
      angularUnit - The angular unit of the longitude.

  • Method Details

    • getGreenwichLongitude

      public double getGreenwichLongitude()
      Longitude of the prime meridian measured from the Greenwich meridian, positive eastward. The greenwichLongitude initial value is zero, and that value shall be used when the meridian name value is "Greenwich".
      Specified by:
      getGreenwichLongitude in interface PrimeMeridian
      Returns:
      The prime meridian Greenwich longitude, in angular unit.

    • getGreenwichLongitude

      public double getGreenwichLongitude(Unit<Angle> targetUnit)
      Returns the longitude value relative to the Greenwich Meridian, expressed in the specified units. This convenience method makes it easier to obtain longitude in decimal degrees (getGreenwichLongitude(NonSI.DEGREE_ANGLE)), regardless of the underlying angular units of this prime meridian.
      Parameters:
      targetUnit - The unit in which to express longitude.
      Returns:
      The Greenwich longitude in the given units.

    • getAngularUnit

      public Unit<Angle> getAngularUnit()
      Returns the angular unit of the Greenwich longitude.
      Specified by:
      getAngularUnit in interface PrimeMeridian
      Returns:
      The angular unit of greenwich longitude.

    • equals

      public boolean equals(AbstractIdentifiedObject object, boolean compareMetadata)
      Compare this prime meridian with the specified object for equality.
      Overrides:
      equals in class AbstractIdentifiedObject
      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 prime meridian. Name, remarks and the like are not taken in account. In other words, two prime meridians 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 Formattable
      Parameters:
      formatter - The formatter to use.
      Returns:
      The WKT element name, which is "PRIMEM"
      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).