org.geotools.referencing.crs
Class DefaultGeographicCRS

java.lang.Object
  org.geotools.referencing.wkt.Formattable
      org.geotools.referencing.AbstractIdentifiedObject
          org.geotools.referencing.AbstractReferenceSystem
              org.geotools.referencing.crs.AbstractCRS
                  org.geotools.referencing.crs.AbstractSingleCRS
                      org.geotools.referencing.crs.DefaultGeographicCRS

All Implemented Interfaces:

org.opengis.referencing.crs.CoordinateReferenceSystem, org.opengis.referencing.crs.GeographicCRS, org.opengis.referencing.IdentifiedObject, org.opengis.referencing.ReferenceSystem, java.io.Serializable, org.opengis.referencing.crs.SingleCRS

public class DefaultGeographicCRS

extends AbstractSingleCRS

implements org.opengis.referencing.crs.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

Version:

$Id: DefaultGeographicCRS.java 17672 2006-01-19 00:25:55Z desruisseaux $

Author:

Martin Desruisseaux

See Also:

Serialized Form

Field Summary

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 org.geotools.referencing.crs.AbstractSingleCRS

datum

Fields inherited from class org.geotools.referencing.crs.AbstractCRS

coordinateSystem

Fields inherited from class org.geotools.referencing.AbstractIdentifiedObject

EMPTY_ALIAS_ARRAY, EMPTY_IDENTIFIER_ARRAY, IDENTIFIER_COMPARATOR, NAME_COMPARATOR, REMARKS_COMPARATOR

Fields inherited from interface org.opengis.referencing.ReferenceSystem

SCOPE_KEY, VALID_AREA_KEY

Fields inherited from interface org.opengis.referencing.IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Constructor Summary

DefaultGeographicCRS(org.opengis.referencing.crs.GeographicCRS crs)
Constructs a new geographic CRS with the same values than the specified one.

DefaultGeographicCRS(java.util.Map properties, org.opengis.referencing.datum.GeodeticDatum datum, org.opengis.referencing.cs.EllipsoidalCS cs)
Constructs a geographic CRS from a set of properties.

DefaultGeographicCRS(java.lang.String name, org.opengis.referencing.datum.GeodeticDatum datum, org.opengis.referencing.cs.EllipsoidalCS cs)
Constructs a geographic CRS from a name.

Method Summary

Measure	distance(double[] coord1, double[] coord2) Computes the orthodromic distance between two points.
protected java.lang.String	formatWKT(Formatter formatter) Format the inner part of a Well Known Text (WKT) element.
int	hashCode() Returns a hash value for this geographic CRS.

Methods inherited from class org.geotools.referencing.crs.AbstractSingleCRS

equals, getAxis, getDatum, getDimension

Methods inherited from class org.geotools.referencing.crs.AbstractCRS

getCoordinateSystem

Methods inherited from class org.geotools.referencing.AbstractReferenceSystem

getScope, getValidArea

Methods inherited from class org.geotools.referencing.AbstractIdentifiedObject

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

Methods inherited from class org.geotools.referencing.wkt.Formattable

toString, toWKT, toWKT, toWKT

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.opengis.referencing.crs.SingleCRS

getCoordinateSystem, getDatum

Methods inherited from interface org.opengis.referencing.ReferenceSystem

getScope, getValidArea

Methods inherited from interface org.opengis.referencing.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 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 degrees and prime meridian is Greenwich.

Constructor Detail

DefaultGeographicCRS

public DefaultGeographicCRS(org.opengis.referencing.crs.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.

Since:

2.2

DefaultGeographicCRS

public DefaultGeographicCRS(java.lang.String name,
                            org.opengis.referencing.datum.GeodeticDatum datum,
                            org.opengis.referencing.cs.EllipsoidalCS cs)

Constructs a geographic CRS from a name.

Parameters:

name - The name.

datum - The datum.

cs - The coordinate system.

DefaultGeographicCRS

public DefaultGeographicCRS(java.util.Map properties,
                            org.opengis.referencing.datum.GeodeticDatum datum,
                            org.opengis.referencing.cs.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

distance

public Measure distance(double[] coord1,
                        double[] coord2)
                 throws java.lang.UnsupportedOperationException,
                        org.opengis.spatialschema.geometry.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 and .

Throws:

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

org.opengis.spatialschema.geometry.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 java.lang.String formatWKT(Formatter formatter)

Format the inner part of a Well Known Text (WKT) element.

Overrides:

formatWKT in class AbstractSingleCRS

Parameters:

formatter - The formatter to use.

Returns:

The WKT element name, which is "GEOGCS"