org.cts.op

Class Geocentric2Geographic

java.lang.Object

org.cts.IdentifiableComponent

org.cts.op.AbstractCoordinateOperation

org.cts.op.Geocentric2Geographic

All Implemented Interfaces:

Identifiable, CoordinateOperation

public class Geocentric2Geographic
extends AbstractCoordinateOperation

Transform geographic coordinates (latitude, longitude, ellipsoidal height into geocentric coordinates.

Geographic coordinates and geocentric coordinates are supposed to use the same reference datum and to be standardized :

• Geographic coordinates are given in the following order : latitude (radians), longitude (radians from Greenwich) and optionnaly ellipsoidal height (default = 0.0).
• The center of the geocentric system (center of the mass) is equal to the geographic coordinates reference ellipsoid.

• Z axis is oriented from origin to North Pole
• Y axis is oriented from origin to intersection of equator and Greenwich Meridian
• OXYZ is direct
• Units = radian, meter (to facilitate transformation operations).

Author:

Michaël Michaud

Field Summary

Fields inherited from class org.cts.op.AbstractCoordinateOperation

precision

Fields inherited from interface org.cts.Identifiable

DEFAULT, LOCAL, UNKNOWN

Constructor Summary

Constructors

Constructor and Description
Geocentric2Geographic(Ellipsoid ellipsoid) Create a new Geographic2Geocentric transformation for a specific ellipsoid.
Geocentric2Geographic(Ellipsoid ellipsoid, double epsilon) Create a new Geographic2Geocentric transformation for a specific ellipsoid.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o) Returns true if o is equals to this.
Ellipsoid	getEllipsoid()
int	hashCode() Returns the hash code for this Geocentric2Geographic.
CoordinateOperation	inverse() Creates the inverse CoordinateOperation.
String	toString() Return a String representation of this Geographic/Geocentric converter.
double[]	transform(double[] coord) Return coordinates representing the same point in a standard geocentric coordinate system.

Methods inherited from class org.cts.op.AbstractCoordinateOperation

getPrecision, isIdentity

Methods inherited from class org.cts.IdentifiableComponent

addAlias, addRemark, getAliases, getAuthorityKey, getAuthorityName, getCode, getComponent, getIdentifier, getName, getRemarks, getShortName, setIdentifier, setRemarks, setShortName

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.cts.Identifiable

addAlias, addRemark, getAliases, getAuthorityKey, getAuthorityName, getCode, getName, getRemarks, getShortName, setRemarks, setShortName

Constructor Detail

Geocentric2Geographic

public Geocentric2Geographic(Ellipsoid ellipsoid)

Create a new Geographic2Geocentric transformation for a specific ellipsoid. The reference datum for both geographic and geocentric coordinates is the same.

Parameters:

ellipsoid - the ellipsoid used to define geographic coordinates

Geocentric2Geographic

public Geocentric2Geographic(Ellipsoid ellipsoid,
                             double epsilon)

Create a new Geographic2Geocentric transformation for a specific ellipsoid. The reference datum for both geographic and geocentric coordinates is the same.

Parameters:

ellipsoid - the ellipsoid used to define geographic coordinates

epsilon - stop condition for the Geocentric to Geographic transformation algorithm (epsilon is a value in radian, 1E-11 is the default epsilon and it means that error is less than 1E-4 m)

Method Detail

transform

public double[] transform(double[] coord)
                   throws IllegalCoordinateException

Return coordinates representing the same point in a standard geocentric coordinate system.

Specified by:

transform in interface CoordinateOperation

Specified by:

transform in class AbstractCoordinateOperation

Parameters:

coord - is an array containing 2 or 3 double representing geographic coordinates in the following order : latitude (radians), longitude (radians from Greenwich) and optionnaly ellipsoidal height (if coord contains only 2 double's, height is set to 0).

Returns:

a double array containing the output coordinate

Throws:

IllegalCoordinateException - if coord is not compatible with this CoordinateOperation.

inverse

public CoordinateOperation inverse()

Creates the inverse CoordinateOperation.

Specified by:

inverse in interface CoordinateOperation

Overrides:

inverse in class AbstractCoordinateOperation

toString

public String toString()

Return a String representation of this Geographic/Geocentric converter.

Overrides:

toString in class IdentifiableComponent

getEllipsoid

public Ellipsoid getEllipsoid()

equals

public boolean equals(Object o)

Returns true if o is equals to this. Tests equality between the ellipsoid used by the transformation.

Overrides:

equals in class IdentifiableComponent

Parameters:

o - The object to compare this Geocentric2Geographic against

hashCode

public int hashCode()

Returns the hash code for this Geocentric2Geographic.

Overrides:

hashCode in class IdentifiableComponent