org.geotools.referencing.crs

Class DefaultGeographicCRS

Object

Formattable

AbstractIdentifiedObject

AbstractReferenceSystem

AbstractCRS

AbstractSingleCRS

DefaultGeographicCRS

All Implemented Interfaces:

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

public class DefaultGeographicCRS
extends AbstractSingleCRS
implements GeographicCRS

A 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 CS type(s)
Ellipsoidal

Since:

2.1

Author:

Martin Desruisseaux (IRD)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static DefaultGeographicCRS	WGS84 A two-dimensional geographic coordinate reference system using WGS84 datum.
static DefaultGeographicCRS	WGS84_3D A three-dimensional geographic coordinate reference system using WGS84 datum.

Fields inherited from class AbstractSingleCRS

datum

Fields inherited from class AbstractCRS

coordinateSystem

Fields inherited from class AbstractIdentifiedObject

EMPTY_ALIAS_ARRAY, EMPTY_IDENTIFIER_ARRAY, IDENTIFIER_COMPARATOR, NAME_COMPARATOR, REMARKS_COMPARATOR

Fields inherited from class Formattable

SINGLE_LINE

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

Constructor and Description
DefaultGeographicCRS(GeodeticDatum datum, EllipsoidalCS cs) Constructs a geographic CRS with the same properties than the given datum.
DefaultGeographicCRS(GeographicCRS crs) Constructs a new geographic CRS with the same values than the specified one.
DefaultGeographicCRS(Map<String,?> properties, GeodeticDatum datum, EllipsoidalCS cs) Constructs a geographic CRS from a set of properties.
DefaultGeographicCRS(String name, GeodeticDatum datum, EllipsoidalCS cs) Constructs a geographic CRS from a name.

Method Summary

Modifier and Type	Method and Description
Measure	distance(double[] coord1, double[] coord2) Computes the orthodromic distance between two points.
protected String	formatWKT(Formatter formatter) Format the inner part of a Well Known Text (WKT) element.
EllipsoidalCS	getCoordinateSystem() Returns the coordinate system.
GeodeticDatum	getDatum() Returns the datum.
int	hashCode() Returns a hash value for this geographic CRS.

Methods inherited from class AbstractSingleCRS

equals, getAxis, getDimension

Methods inherited from class AbstractReferenceSystem

getDomainOfValidity, getScope, getValidArea

Methods inherited from class AbstractIdentifiedObject

asSet, ensureAngularUnit, ensureLinearUnit, ensureNonNull, ensureNonNull, ensureTimeUnit, equals, equals, equals, equals, getAlias, getIdentifier, getIdentifier, getIdentifiers, getName, getName, getName, getProperties, getProperties, getRemarks, nameMatches, nameMatches, nameMatches

Methods inherited from class Formattable

cleanupThreadLocals, toString, toWKT, toWKT, toWKT, 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

Field Detail

WGS84

public static final DefaultGeographicCRS WGS84

A two-dimensional geographic coordinate reference system using WGS84 datum. This CRS uses (longitude,latitude) ordinates with longitude values increasing East and latitude values increasing North. Angular units are decimal degrees and prime meridian is Greenwich.

WGS84_3D

public static final DefaultGeographicCRS WGS84_3D

A three-dimensional geographic coordinate reference system using WGS84 datum. This CRS uses (longitude,latitude,height) ordinates with longitude values increasing East, latitude values increasing North and height above the ellipsoid in metres. Angular units are decimal degrees and prime meridian is Greenwich.

Constructor Detail

DefaultGeographicCRS

public DefaultGeographicCRS(GeographicCRS crs)

Constructs a new geographic CRS 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:

crs - The coordinate reference system to copy.

Since:

2.2

DefaultGeographicCRS

public DefaultGeographicCRS(GeodeticDatum datum,
                            EllipsoidalCS cs)

Constructs a geographic CRS with the same properties than the given datum. The inherited properties include the name and aliases.

Parameters:

datum - The datum.

cs - The coordinate system.

Since:

2.5

DefaultGeographicCRS

public DefaultGeographicCRS(String name,
                            GeodeticDatum datum,
                            EllipsoidalCS cs)

Constructs a geographic CRS from a name.

Parameters:

name - The name.

datum - The datum.

cs - The coordinate system.

DefaultGeographicCRS

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

Constructs a geographic CRS from a set of properties. The properties are given unchanged to the super-class constructor.

Parameters:

properties - Set of properties. Should contains at least "name".

datum - The datum.

cs - The coordinate system.

Method Detail

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.

getDatum

public GeodeticDatum getDatum()

Returns the datum.

Specified by:

getDatum in interface GeodeticCRS

Specified by:

getDatum in interface SingleCRS

Overrides:

getDatum in class AbstractSingleCRS

Returns:

The datum.

distance

public Measure distance(double[] coord1,
                        double[] coord2)
                 throws UnsupportedOperationException,
                        MismatchedDimensionException

Computes the orthodromic distance between two points. This convenience method delegates the work to the underlyling ellipsoid, if possible.

Overrides:

distance in class AbstractCRS

Parameters:

coord1 - Coordinates of the first point.

coord2 - Coordinates of the second point.

Returns:

The distance between coord1 and coord2.

Throws:

UnsupportedOperationException - if this coordinate reference system can't compute distances.

MismatchedDimensionException - if a coordinate doesn't have the expected dimension.

hashCode

public int hashCode()

Returns a hash value for this geographic CRS.

Overrides:

hashCode in class AbstractSingleCRS

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 AbstractCRS

Parameters:

formatter - The formatter to use.

Returns:

The name of the WKT element type, which is "GEOGCS".

See Also:

Formattable.toWKT(), Formattable.toString()