org.apache.sis.referencing.crs

Class DefaultGeographicCRS

Object

FormattableObject

AbstractIdentifiedObject

AbstractReferenceSystem

AbstractCRS

DefaultGeographicCRS

All Implemented Interfaces:

Serializable, Deprecable, LenientComparable, CoordinateReferenceSystem, GeodeticCRS, GeographicCRS, SingleCRS, IdentifiedObject, ReferenceSystem

public class DefaultGeographicCRS
extends AbstractCRS
implements GeographicCRS

A 2- or 3-dimensional coordinate reference system based on an ellipsoidal approximation of the geoid. This provides an accurate representation of the geometry of geographic features for a large portion of the earth's surface.

Used with datum type: Geodetic.
Used with coordinate system type: Ellipsoidal.

Creating new geographic CRS instances

New instances can be created either directly by specifying all information to a factory method (choices 3 and 4 below), or indirectly by specifying the identifier of an entry in a database (choices 1 and 2 below). Choice 1 in the following list is the easiest but most restrictive way to get a geographic CRS. The other choices provide more freedom.

1. Create a Geographic­CRS from one of the static convenience shortcuts listed in Common­CRS.geographic() or Common­CRS.geographic3D().
2. Create a Geographic­CRS from an identifier in a database by invoking Geodetic­Authority­Factory.create­Geographic­CRS(String).
3. Create a Geographic­CRS by invoking the CRSFactory.create­Geographic­CRS(…) method (implemented for example by Geodetic­Object­Factory).
4. Create a Geographic­CRS by invoking the constructor.

Example: the following code gets a two-dimensional geographic CRS using the World Geodetic System 1984 datum:

GeodeticDatum datum = CommonCRS.WGS84.geographic();

Immutability and thread safety

This class is immutable and thus thread-safe if the property values (not necessarily the map itself), the coordinate system and the datum instances given to the constructor are also immutable. Unless otherwise noted in the javadoc, this condition holds if all components were created using only SIS factories and static constants.

Since:

0.4

See Also:

Geodetic­Authority­Factory.create­Geographic­CRS(String), Serialized Form

Defined in the sis-referencing module

Field Summary

Fields inherited from class AbstractIdentifiedObject

DEPRECATED_KEY, LOCALE_KEY

Fields inherited from interface ReferenceSystem

DOMAIN_OF_VALIDITY_KEY, SCOPE_KEY

Fields inherited from interface IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DefaultGeographicCRS(GeographicCRS crs) Constructs a new coordinate reference system with the same values than the specified one.
	DefaultGeographicCRS(Map<String,?> properties, GeodeticDatum datum, EllipsoidalCS cs) Creates a coordinate reference system from the given properties, datum and coordinate system.

Method Summary

Modifier and Type	Method and Description
static DefaultGeographicCRS	castOrCopy(GeographicCRS object) Returns a SIS coordinate reference system implementation with the same values than the given arbitrary implementation.
DefaultGeographicCRS	forConvention(AxesConvention convention) Returns a coordinate reference system equivalent to this one but with axes rearranged according the given convention.
protected String	formatTo(Formatter formatter) Formats this CRS as a Well Known Text Geodetic­CRS[…] element.
EllipsoidalCS	getCoordinateSystem() Returns the coordinate system.
GeodeticDatum	getDatum() Returns the geodetic datum associated to this geographic CRS.
Class<? extends GeographicCRS>	getInterface() Returns the GeoAPI interface implemented by this class.

Methods inherited from class AbstractCRS

cast­Or­Copy, compute­Hash­Code, equals

Methods inherited from class AbstractReferenceSystem

get­Domain­Of­Validity, get­Scope

Methods inherited from class AbstractIdentifiedObject

cast­Or­Copy, equals, get­Alias, get­Description, get­Identifiers, get­Name, get­Remarks, hash­Code, is­Deprecated, is­Heuristic­Match­For­Name

Methods inherited from class FormattableObject

print, to­String, to­String, to­WKT

Methods inherited from class Object

clone, finalize, get­Class, notify, notify­All, wait, wait, wait

Methods inherited from interface ReferenceSystem

get­Domain­Of­Validity, get­Scope

Methods inherited from interface IdentifiedObject

get­Alias, get­Identifiers, get­Name, get­Remarks, to­WKT

Constructor Detail

DefaultGeographicCRS

public DefaultGeographicCRS(Map<String,?> properties,
                            GeodeticDatum datum,
                            EllipsoidalCS cs)

Creates a coordinate reference system from the given properties, datum and coordinate system. The properties given in argument follow the same rules than for the super-class constructor. The following table is a reminder of main (not all) properties:

Recognized properties (non exhaustive list)

Property name	Value type	Returned by
"name"	ReferenceIdentifier or String	AbstractIdentifiedObject.getName()
"alias"	GenericName or Char­Sequence (optionally as array)	AbstractIdentifiedObject.getAlias()
"identifiers"	ReferenceIdentifier (optionally as array)	AbstractIdentifiedObject.getIdentifiers()
"remarks"	InternationalString or String	AbstractIdentifiedObject.getRemarks()
"domainOfValidity"	Extent	AbstractReferenceSystem.getDomainOfValidity()
"scope"	InternationalString or String	AbstractReferenceSystem.getScope()

Parameters:

properties - the properties to be given to the coordinate reference system.

datum - the datum.

cs - the two- or three-dimensional coordinate system.

See Also:

Geodetic­Object­Factory.create­Geographic­CRS(Map, Geodetic­Datum, Ellipsoidal­CS)

DefaultGeographicCRS

protected DefaultGeographicCRS(GeographicCRS crs)

Constructs a new coordinate reference system with the same values than the specified one. This copy constructor provides a way to convert an arbitrary implementation into a SIS 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:

crs - the coordinate reference system to copy.

See Also:

cast­Or­Copy(Geographic­CRS)

Method Detail

castOrCopy

public static DefaultGeographicCRS castOrCopy(GeographicCRS object)

Returns a SIS coordinate reference system implementation with the same values than the given arbitrary implementation. If the given object is null, then this method returns null. Otherwise if the given object is already a SIS implementation, then the given object is returned unchanged. Otherwise a new SIS implementation is created and initialized to the attribute values of the given object.

Parameters:

object - the object to get as a SIS implementation, or null if none.

Returns:

a SIS implementation containing the values of the given object (may be the given object itself), or null if the argument was null.

getInterface

public Class<? extends GeographicCRS> getInterface()

Returns the GeoAPI interface implemented by this class. The SIS implementation returns Geographic­CRS.class.

Note for implementors: Subclasses usually do not need to override this method since GeoAPI does not define Geographic­CRS sub-interface. Overriding possibility is left mostly for implementors who wish to extend GeoAPI with their own set of interfaces.

Returns:

Geographic­CRS.class or a user-defined sub-interface.

getDatum

public final GeodeticDatum getDatum()

Returns the geodetic datum associated to this geographic CRS. This is the datum given at construction time.

Specified by:

get­Datum in interface Geodetic­CRS

Specified by:

get­Datum in interface Single­CRS

Returns:

the geodetic datum associated to this geographic CRS.

getCoordinateSystem

public EllipsoidalCS getCoordinateSystem()

Returns the coordinate system.

Specified by:

get­Coordinate­System in interface Coordinate­Reference­System

Specified by:

get­Coordinate­System in interface Geographic­CRS

Specified by:

get­Coordinate­System in interface Single­CRS

Overrides:

get­Coordinate­System in class Abstract­CRS

Returns:

the coordinate system.

forConvention

public DefaultGeographicCRS forConvention(AxesConvention convention)

Returns a coordinate reference system equivalent to this one but with axes rearranged according the given convention. If this CRS is already compatible with the given convention, then this method returns this.

Overrides:

for­Convention in class Abstract­CRS

Parameters:

convention - the axes convention for which a coordinate reference system is desired.

Returns:

a coordinate reference system compatible with the given convention (may be this).

See Also:

Abstract­CS.for­Convention(Axes­Convention)

formatTo

protected String formatTo(Formatter formatter)

Formats this CRS as a Well Known Text Geodetic­CRS[…] element.

Example: Well-Known Text (version 2) of a geographic coordinate reference system using the WGS 84 datum.

GeodeticCRS["WGS 84",
   Datum["World Geodetic System 1984",
     Ellipsoid["WGS84", 6378137.0, 298.257223563, LengthUnit["metre", 1]]],
     PrimeMeridian["Greenwich", 0.0, AngleUnit["degree", 0.017453292519943295]],
   CS["ellipsoidal", 2],
     Axis["Latitude", north],
     Axis["Longitude", east],
     AngleUnit["degree", 0.017453292519943295],
   Area["World"],
   BBox[-90.00, -180.00, 90.00, 180.00],
   Scope["Used by GPS satellite navigation system."],
   Id["EPSG", 4326, Citation["IOGP"], URI["urn:ogc:def:crs:EPSG::4326"]]]

Same coordinate reference system using WKT 1.

GEOGCS["WGS 84",
   DATUM["World Geodetic System 1984",
     SPHEROID["WGS84", 6378137.0, 298.257223563]],
     PRIMEM["Greenwich", 0.0],
   UNIT["degree", 0.017453292519943295],
   AXIS["Latitude", NORTH],
   AXIS["Longitude", EAST],
   AUTHORITY["EPSG", "4326"]]

Parameters:

formatter - the formatter where to format the inner content of this WKT element.

Returns:

"Geodetic­CRS" (WKT 2) or "Geog­CS" (WKT 1).

See Also:

WKT 2 specification §8