org.geotools.referencing.crs
Class DefaultGeographicCRS

Object
  extended by Formattable
      extended by AbstractIdentifiedObject
          extended by AbstractReferenceSystem
              extended by AbstractCRS
                  extended by AbstractSingleCRS
                      extended by 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
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
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
 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()


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